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KIM [24]
2 years ago
10

When are sister chromatids separated during the cell cycle

Biology
1 answer:
slamgirl [31]2 years ago
4 0

Answer:

in anaphase.

Explanation:

during which each chromosome's sister chromatids separate and move to opposite poles of the cell.

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Properties of life include the use of blank to power an organisms activities
OlgaM077 [116]

Answer:

Properties of life include the use of <u><em>energy</em></u> to power an organisms activities.

Explanation:

Energy is the driving force which allows every cell to perform its functions. Organisms like humans tend to gain energy by the process of cellular respiration. Cellular respiration can be described as a process in which organisms make carbon dioxide and water from glucose (from food) and oxygen (from air). Huge amounts of ATP is also released during this process. In plants, the process of photosynthesis and cellular respiration supplies them with the energy sources.

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3 years ago
A host organism needs time, often days, to mount an immune response against a new antigen, but memory cells permit a rapid respo
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Answer:

The answer is <em><u>D. </u></em>

Explanation:

Viruses can evade the processing and presentation of antigens, for example by interfering with the expression of MHC class I proteins, although this increases their susceptibility to be detected by natural killer cells (NK). However, some members of the herpesvirus, papillomavirus, retrovirus, poxvirus and flavivirus families have also developed strategies to escape the attack of NK cells and promote their survival, inhibiting cell apoptosis. Finally, some pathogens often change surface antigens frequently, as in the case of influenza viruses (orthomyxovirus).

The human immunodeficiency virus (HIV) affects CD4 + T cells and degrades the host's ability to counterattack with a strong cell-mediated immune response. There are so many tactics of immune evasion used by HIV, which have so far hindered the development of an effective vaccine.

7 0
3 years ago
What are the two functions of the respiration system?
Wewaii [24]
Can I please have some more details, thanks
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2 years ago
(Ch. 27.4) Many people are allergic to substances in the environment, such as ragweed pollen, as well as foods, such as peanuts.
djverab [1.8K]

Answer:

C. The substance does not directly harm tissues and is not a pathogen, but nevertheless triggers an inflammatory response.

Explanation:

When a person is allergic to a substance, his or her immune system recognizes a harmless substance, such as components in food, pollen, or dust, as a treat. As a consequence, it starts an immune response that leads to inflammation. The substance that starts the allergic reaction is called an allergen, and it is not a pathogen because it is not a real threat to the body since it does not infect cells. When the allergen enters the body, it binds to antibodies that are in contact with a special type of cell. These specific cells will release a substance known as histamine. Histamine will produce an inflammatory reaction affecting different tissues in our body. For example, it can make us sneeze, have a running nose, swelling parts of our body, have itchiness and redness, amongst others.

3 0
2 years ago
Which of the following is not a characteristic of a mineral?
Talja [164]

Answer:

strike

Good luck!

4 0
2 years ago
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