Answer:
Explanation:
2nd one
To create a knockout mouse, after introducing to ES cells a DNA construct in which a specific gene is mutagenized by the insertion of a drug resistance marker, the cells Multiple Choice that have incorporated the transgene by homologous recombination grow in the presence of the drug and these are injected into a host blastocyst. that lack the transgene grow in the presence of the drug and these are injected into a host blastocyst. that have deleted the transgene grow in the presence of the drug and the nuclei are injected into a host blastocyst. that lack the transgene grow in the presence of the drug and the nuclei are used for nuclear transfer.
To create a knockout mouse, after introducing to ES cells a DNA construct in which a specific gene is mutagenized by the insertion of a drug resistance marker, the cells, that have incorporated the transgene by homologous recombination grow in the presence of the drug and these are injected into a host blastocyst. The correct option is A.
What is biological marker?A biomarker is an objective measure of what is going on in a cell or organism at any given time. Biomarkers can serve as health-related early warning systems.
To create knockout mice, researchers insert artificial DNA into the chromosomes contained in the nuclei of ES cells using one of two methods.
Both methods are performed in vitro, that is, on cultured cells grown in a laboratory setting.
After introducing a DNA construct into ES cells that mutagenizes a specific gene by inserting a drug resistance marker, the cells that have incorporated the transgene via homologous recombination grow in the presence of the drug and are injected into a host blastocyst.
Thus, the correct option is A.
For more details regarding biological marker, visit:
https://brainly.com/question/28502967
#SPJ6
Immunization with the childhood DPT (diphtheria, pertussis, and tetanus) vaccine protects against subsequent exposure to tetanus by Group of answer choices generating tetanus-specific memory B cells. producing life-spanning antitetanus IgE antibodies. stimulating quick inflammation upon future exposure. preloading antigen-presenting cells. stopping isotype switching of B cells from IgM to IgA.
Answer:
generating tetanus-specific memory B cells
Explanation:
Memory B cells are cells of the immune system that produce antibodies against specific antigens present in pathogenic organisms. The B lymphocyte cells produce clonal memory B cells after the first exposure to the antigen, a process known as clonal selection. Subsequently, memory B cells that circulate in the bloodstream trigger a rapid secondary immune response (after a second exposure to the antigen) by producing antibodies against specific antigens that activated their parent B cell. Moreover, the DPT vaccine includes purified tetanus toxins (i.e., target antigens) that induce clonal expansion in specific B cells, thereby generating a population of memory B cells that produce specific antibodies rapidly in secondary immune responses.
A cell is modified and all of its DNA is removed. What will be the most
immediate impact of this on the cell?
Earthquakes occur when:
A.the earth's plates rub against each other
B.magma squeezes through cracks in the crust
C.eroded sediment is carried away
D.heat and pressure build up under the surface
Answer:
B: magma squeezes through crcks in the crust
Explanation:
Lava (magma that has erupted onto the Earth's surface) is visually mesmerizing – as the molten rock flows downhill, lava exposed to the air cools to a deep black color, while the molten rock beneath glows bright orange.
im not sure ha but ok nadin yan
If a star is shown to be 33.11 trillion kilometers away, how many light years would that be?
light years
Answer:
3.5
Explanation:
Circle the pairing of organisms from Model 3 that you predict would have the most divergence in their DNA. Support your choices with a group discussion about morphology (observable characteristics and structure), ecology, and lifestyles of the animals
a. whale and human or whale and tuna
b. pig and rhesus monkey or pig and chicken
c. tuna and fly or tuna and chicken
Answer:
a. whale and tuna
b. pig and chicken
c. tuna and fly
Explanation:
Following, you will find characteristics of each species that differ in the contrasting groups. These descriptions reflect the divergence degree between groups.
a. whale and tuna
Whales: Vertebrate and Big-sized marine mammals. They are long-lived and pulmonate animals. They are relatively slow, and only breathe while they are on the surface, opening the blowhole which covers the narines. Despite being mammals, they lack hair, so they have naked soft skin. They have one dorsal fin, two lateral flippers, and a caudal horizontal fin, which they move up and down. They are viviparous, with internal fecundation, and females carry mammal glands to feed their offspring. They feed on krill and other small animals, which they filtrate using their baleens. Whales exhibit the Type I survivorship curve. Mortality often occurs at the end of the cycle. They have long cycles of life and high probabilities to survive until they are old enough. These species have few descendants and spend too much time and energy in parental care to ensure their reproductive success. They are used to swim deep depth or near the surface depending on the reproductive cycle stage. Tuna: Bony marine fish. Fusiform and medium-sized body, fast swimmers. They can live for 15 years. Their body is covered with scams. They have two dorsal fins, two ventral fins, two lateral fins, and a caudal fin which they move from side to side. It swims near the surface and interchange gas using the grills. They have many teeth and feed on anything they can, such as small fishes, zooplankton, crustaceans, and mollusks. They have external fecundation and exhibit the Type III survivorship curve. Significant mortality during the early stages of life. Only a few individuals reach the later life stages, getting to survive their first period of life. Survivors usually have a long life. These species produce big offsprings at the same time, but they provide little or no parental care. Their reproductive success relies on the number of descendants.b. pig and chicken
Pigs: Heary Mammal, with thick hairs, called bristles and mammal glands. They are four-legged, have hooves and four fingers. Their snout is long and flexible, with sharp teeth. They have a curly tail and thick and sensitive skin. Naturally, they are herbivorous but became omnivorous in captivity. They can live for ten or fifteen years. Viviparous. Well-developed smell sense and no sudoriparous glands. Territorial, dominant, and highly communicative with partners. They can use more than twenty different sounds. They also exhibit the Type I survivorship curve.Chickens: Birds. They have two legs and two wings however, it has never been successful in flying. Their body is cover by feathers. They have no hair, and they do not have teeth either, but they have a corneous peak instead. They are omnivorous. They show sexual dimorphism, especially in feathers and crests. They exhibit the type II survivorship curve. The probabilities of dying are equals all along the cycle, at any age interval. The number of dead individuals remains constant from the beginning to the end of the life cycle. These species have reduced offsprings, and they ensure their reproductive success by providing some significant parental care.c. tuna and fly
Tuna: Already described aboveFly: Flying and small-sized Insects. Dipterous, with their bodies divided into three regions: Head, thorax, and abdomen. They have six appendixes to walk, one pair of wee-developed wings, one pair of vestigial wings, eyes very sensitive to light. The mouthparts are used to lick, suck or bite. Some species can sting and suck blood from humans. Their body is covered with thin hairs and sensory bristles used to taste, feel, and smell. They are attracted by smelly matter, from which they feed on. In general, flies are associated to matter in decomposition and wastes. They have a short life cycle and can live up to twenty-five days. Ovoviviparous species, laying too many eggs that will turn into larvae and finally to the adult fly stage.Based on Model 3, the pairing of organisms that would have the most divergence in their DNA is: A. whale and human or whale and tuna.
What is genetics?Genetics can be defined as the scientific study of genes, chromosomes, heredity and the similarities or divergence (variations) of traits (DNA) in living organisms such as animals, humans, and plants.
Based on morphology and ecology, whales are aquatic and gigantic vertebrate (mammals) that only live in water. Also, whales are pulmonate and carnivorous animals that feed on other animals.
From Model 3, the number of amino acids differences between whale and human is ten (10) while that of whale and tuna is equal to seventeen (17). Therefore, we can deduce that the pairing of organisms that would have the most divergence in their DNA is whale and human or whale and tuna.
Read more on genetics here: https://brainly.com/question/1548948
A ______ is anything in the environment that affects the behavior of an organism.
tropism
hormone
stomata
stimulus
Answer: stimulus
Explanation:
A stimulus is anything in the environment that affects the behavior of an organism.
A stimulus is anything in the environment that affects the behavior of an organism.
g There are three alleles at a gene determining eye color in a population of wild cats, the B allele (brown eyes) is dominant to both the G allele (green eyes) and the Y allele (yellow eyes). The G allele is dominant to the Y allele. In a population of 1000, there are 100 yellow-eyed cats, 400 green-eyed cats, and 500 brown-eyed cats. What is the expected frequency of the Y allele
Answer:
the expected frequency of the Y allele = recessive allelic frequency = 0.316 ≅ 0.32
Explanation:
Due to technical problems, you will find the complete explanation in the attached files.
How are Photosynthesis and Cellular Respiration Cycles connected?
1)The products of one cycle become the reactants of the other.
2)The sun provides energy for both photosynthesis and respiration.
3)Photosynthesis and respiration both take place in the mitochondria.
4)Animals eat plants for food and then do not need to perform respiration
Which statement regarding DNA packing in eukaryotes is false?
A Tight DNA packing tends to promote gene expression
B) Euchromatin can be highly expressed
с
none of the answers are false
D
A nucleosome consists of DNA wound around a core of 8 histone
molecules.
E Highly compacted chromatin is generally not expressed at all.
Answer:
The correct answer is - A. Tight DNA packing tends to promote gene expression.
Explanation:
Euchromatin which is less packed or condensed is highly expressed as it participates in the transcription whereas highly compacted chromatin - heterochromatin not expressed at all as these does undergoes the transcription process.
DNA binds around a core of 8 subunits of Histone protein in a nucleosome in which DNA is negatively charged and histone protein is positively charged protein .
DNA packing decreases its transcription and hence no expression.
In animals sexual reproduction requires
Answer:
The placement of sperm within female's reproductive track.
Explanation:
In animals, sexual reproduction requires sperm of male has to be placed in the reproductive track of female where eggs are present. The sperm of male fuse with eggs of female produces zygote which turns into an offspring. The sperm of male and egg of female are haploid in nature means having half number of chromosomes but when they fused together then the zygote which is formed is diploid i.e. double number of chromosomes. The gametes are formed through meiosis not mitosis. Mitosis cell division occur in body cells.
How is Earth’s outer layer similar to a cracked hard-boiled egg?
Answer:
They're similar because both Earth's layer and a cracked hard boiled egg have a thin brittle shell.
Explanation:
In what ecosystem have many organisms adapted to a changing salt content in the water?
A. intertidal area
B. estuary
C. swamp
D. salt marsh
Answer:
intertidal area
Explanation:
Answer:
most likely a salt marsh
Explanation:
The role of the 23S rRNA of the large ribosomal subunit of E. coli during protein synthesis is: Question 50 options: helps to form the A site within the ribosome contributes to the process of translocation during the elongation stage of protein synthesis none of these choices is correct actively forms a peptide bond by acting as a ribozyme aid in initiation of protein synthesis
Answer:
Actively forms a peptide bond by acting as a ribozyme aid in initiation of protein synthesis.
Explanation:
The role of the 23S rRNA of the large ribosomal subunit of E. coli during protein synthesis is the formation of a peptide bond by acting as a ribozyme aid in initiation of protein synthesis. 23S rRNA has an important function of peptidyl transferase. Both peptidyl-tRNA and aminoacyl-tRNA are necessary for synthesis of protein and transpeptidation response. The 23S rRNA positions have a significant function in the binding of tRNA in P site of the large ribosomal subunit.
2. The diagram below represents a food web composed of producers, consumers, and
decomposers.
A
B
D
Which group would represent the decomposer organisms?
1) A
2) B
3) C
4) D
Answer:
B
Explanation:
because that is the 2nd decompers
B group would represent the decomposer organisms. Therefore, the correct option is B.
What are Decomposers?Decomposers are organisms that convert decaying organic matter into more basic components. They are an important component of the nutrition cycle because they convert complex chemical substances, such as nitrogen and carbon, into direct nutrients that can be absorbed by plants and other living things.
Some species of bacteria, fungi and insects are specialized decomposers. These organisms are essential to maintaining healthy soil because they aid in the recycling of nutrients and the breakdown of organic matter, which would otherwise build up and cause nutrient imbalances. Decomposers, which break down dead organisms and aid in the containment of pathogens, may be important in disease prevention.
Therefore, the correct option is B.
Learn more about Decomposers here:
https://brainly.com/question/28896356
#SPJ2
Describe the preservation principle of salting
Salting, especially of meat, is an ancient preservation technique. The salt draws out moisture and creates an environment inhospitable to bacteria. If salted in cold weather (so that the meat does not spoil while the salt has time to take effect), salted meat can last for years.☜(ﾟヮﾟ☜) (⌐■_■)
In an effort to maintain homeostasis, the organ systems of the human body work to keep the body's internal water level constant. Which of the following statements describe how the human body responds when its internal water level drops too low?
(I’ll give brainliest)
A. The skeletal system produces more circulating blood cells that insecure the body’s water intake
B. The excretory system signals the kidneys to retain more water and produce more concentrated urine to decrease water loss.
C. The nervous system signals the muscles to constrict , holding more water in the digestive track and decreasing water loss .
D.The excretory system signals the kidneys to release more water into the bladder to increase water loss .
Answer:
B.
Explanation:
When we are dehydrated, our urine tends to be more yellow, right? That's because our urine contained less water to dilute the chemical compounds causing the yellow color — when we're dehydrated, our kidneys decide to pull less water out of the bloodstream than normal.
What kingdom is made of organisms that are eukaryotic, plant-like, do not move, and do not carry on photosynthesis?
Answer: Fungi
Explanation: It just is
Answer:
Fungi
Explanation:
Many diverse organisms including algae, amoebas, ciliates (such as paramecium) fit the general moniker of protist. "The simplest definition is that protists are all the eukaryotic organisms that are not animals, plants or fungi," said Alastair Simpson, a professor in the department of biology at Dalhousie University.
Cystic fibrosis is an autosomal recessive disorder where a chloride ion membrane channel protein doesn't function properly. People with cystic fibrosis suffer from chronic lung infections that make breathing very difficult. They also suffer from other issues such as an inability to produce enough digestive enzymes due to problems with pancreas cells. Suppose that Chris and Shannon are both carrier of cystic fibrosis (carriers have the allele but do not exhibit the disorder). What is Chris' genotype for the cystic fibrosis gene
Answer: Typically, the genotype in those patients consists of at least one very mild mutation uncharacteristic for CF patients. These are predominantly missense or splice variants, belonging to classes IV or V producing variable amounts of functional CFTR protein at the apical membrane.
In order to conserve resources, Evelyn uses her old homework as scrap paper
and never throws away paper with writing only on one side,
What kind of conservation is Evelyn practicing?
A. Recycling
B. Waste
C. Renewal
D. Reuse
Answer:
Evelyn is using reuse as a form of conservation
1 point
What is the purpose of respiration based on the image below?
Glucose
Oxygen
un
Carbon
Dioxide
Energy
Water
O To make glucose
O To make water and carbon dioxide
O To make energy
Answer:
I think the answer is To make energy
Explanation:
To release energy and carbon dioxide from the food with the help of the oxygen.
An S-shaped pattern formed when a stream flows through channels is called
Answer:
meander
Explanation:
A meander is a series of regular sinuous curves in the channel of a stream/river/watercourse, thereby forming a rounded or "S"-shaped bend curve. Meanders are common in alluvial areas that have low gradients, where they are formed by the dynamics of the watercourse. The meander belt is the zone within which a meandering watercourse occupies on its floodplain. The sinuosity is a measure to calculate the degree of meandering in the channel of a watercourse.
Which of these statements about Hox genes is true?
A. They regulate the development of body parts.
B. They occur in random places on the chromosome.
c. They were first discovered in mammals.
D. They are only involved in the development of embryos,
not adults.
Answer:
A. They regulate the development of body parts
Explanation:
I just did it on Savvas (Pearson)
The statement which is true about HOX genes is they regulate the development of body parts.
What do you mean by HOX genes?HOX genes may be defined as components of the homeotic transcription factor family that play a key part in controlling the body plan.
HOX genes play two important roles, which are given below:
Specifying the place where the limb of organisms forms.Specifying whether the particular mesenchyme cells will become stylopod, zeugopod, and autopod.Therefore, the statement which is true about HOX genes is they regulate the development of body parts.
To learn more about HOX genes, refer to the link:
https://brainly.com/question/22998796
#SPJ2
Describe the levels of organization found in your neighborhood from the smallest level of organization to the largest.
Answer:tissue
Explanation:
Tissues are groups of cells that have a similar structure and act together to perform a specific function. The word tissue comes from a form of an old French verb meaning “to weave”. ... Groups of tissues make up organs in the body such as the brain and heart.
Two protein kinases, PK1 and PK2, work sequentially in an intracellular signaling pathway. You create cells that contain inactivating mutations in the genes that encode either PK1 or PK2 and find that these cells no longer respond to a particular extracellular signal. You also create cells containing a version of PK1 that is permanently active and find that the cells behave as though they are receiving the signal even when the signal is not present. When you introduce the permanently active version of PK1 into cells that have an inactivating mutation in PK2, you find that these cells also behave as though they are receiving the signal even when no signal is present.
Answer the following question in the space give.
A. From these results, does PK1 activate PK2, or does PK2 activate PK1? Explain your answer.
Answer:
The answer is "PK1 activates PK2"
Explanation:
All enzymes were required again for the transmission of a signal. If Pk1 is continuously active, pk2 will no longer be required, as per my theory, can trigger pk1, therefore the cells were if they amplify the message even when they're not active. But since both enzymes require regular copies together for transduction, pk2 is simple and pk1 requires to also be activated.
Which of the following describes the relationship between genes and chromosomes?
Select one:
Every gene an organism has is found on every one of its chromosomes.
Genes are special sequences of nucleic acids found on chromosomes.
All of an organism’s chromosomes can be found next to its genes in the cell nucleus.
Chromosomes form into genes during cellular reproduction.
Answer:
Genes are segments of deoxyribonucleic acid (DNA) that contain the code for a specific protein that functions in one or more types of cells in the body. Chromosomes are structures within cells that contain a person's genes. Genes are contained in chromosomes, which are in the cell nucleus.
Explanation:
What is the primary purpose of special-interest groups?
O A. To determine a person's social status
O B. To control the means of production
C. To teach people how to take care of themselves
D. To influence political decisions
Answer:
The answer is D. To influence political decisions
Explanation:
Determine whether each of the following are characteristic of open-mindedness, skepticism, or both.
an important part of science
the interest in new or different ideas
open-mindedness
skepticism
both
if not checked, it can prevent progress
leads to critical evaluation of ideas
if not checked, it can lead to ideas being accepted without significant evidence
to support them
DONE
1 Intro
Answer:both,open-mindedness,skepticism,skepticism,open-mindedness
Explanation:
PLEASE HELP IF YOU KNOW ABT PUNNETT SQUARES!!! Mendel conducted a cross between purebred organisms. Use a punnett square to show a cross between a purebred pea plant with yellow seeds and a purebred pea plant with green seeds. What would be all of the possible genotypes of all the offspring?
A. 100% yy
B. 100% Yy
C. 50% Yy and 50% yy
D. 75% Yy and 25% yy
Answer:
B
Explanation:
I assume the plants with the yellow seeds are dominate (YY) , while the ones with green seeds are recessive (yy) (Since it would need to be recessive to be a different color than the dominate). The genes will always be heterozygous then, since it combines the genes from both parents.
Which model shows a way that large molecules can enter a cell without using
the cell's energy?
Answer:
C
Explanation:
There was no C and D on yours but here is a picture of my son's exam.