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balu736 [363]
3 years ago
7

A biologist identifies a mutant line of mice that lacks the cellular immune response. She suspects that a mutation in these mice

affects the ability of host cells to carry out the antigen presentation step during the activation phase. What could the biologist do to test her hypothesis
Biology
1 answer:
Pepsi [2]3 years ago
5 0

Answer:

Isolate antigen-presenting host cells from mice known to have an intact cellular immune response and inject these into the mutant mice to see if the normal response can be restored.

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URGENTTT
suter [353]

Answer:

D Independent assortment occurs when chromosomes separate during meiosis and causes variations that can be beneficial or harmful to a species

Explanation:

During meiosis, the homologous chromosomes separate and segregate independently of each other. This process is referred to as 'independent assortment'. In consequence, different gene variants or 'alleles' localized in homologous chromosomes segregate independently of each other during gamete formation, thereby one particular gamete has an equal probability to carry either of these segregating alleles. Independent assortment generates genetic variation in the gametes, which can be beneficial or deleterious in a given environment.

8 0
2 years ago
In a lab diagnosis, a pathologist observed a test sample from a tuberculosis patient under a high-power microscope. Which type o
Allushta [10]
Mycobacterium bacteria is rod shaped. The specific species that caused TB is mycobacterium tuberculosis.
7 0
3 years ago
Cytokinesis usually, but not always, follows mitosis. If a cell completed mitosis but not cytokinesis, the result would be a cel
Gnoma [55]
So what are you asking hun? Can I see a pic
3 0
2 years ago
How many neutrons does element x have if its atomic number is 43 and it's mass number is 153?
s2008m [1.1K]
Neutron number of element X-110
Explanation: 153(Proton+Neutron)-43(Proton)= 110
7 0
3 years ago
How can a human cell in prophase of mitosis be distinguished from human cell in prophase l of meiosis?A. By the presence of kine
Len [333]

Answer:

E. By presence of paired homologous chromosomes in the meiotic cell.

Explanation:

Differences between Mitotic Prophase and Prophase 1 of Meiosis:

  • The prophase of mitosis is relatively shorter than prophase 1 of meiosis.
  • Prophase of mitosis is characterized by the disintegration of the nuclear membrane and the movement of the duplicated centrioles towards the two poles of the cell.
  • Prophase 1 of meiosis is relatively longer and involves a number of consecutive events that do not occur in the mitotic prophase.
  • Prophase 1 of meiosis involves the disintegration of the nuclear membrane as well. But the most important event of this phase is the pairing of homologous chromosomes through a connection called a synapse. This is called chiasmata formation. Homologous chromosomes pair up in form of tetrads and exchange segments with each other. This process is called crossing over and it is crucial in the production of genetically varied daughter cells.  
7 0
2 years ago
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