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3 years ago

Cytotoxic T (Tc) cells are like a natural killer (NK) cell because they both

Biology

1 answer:

denis-greek [22]3 years ago

7 0

Answer:

B. secrete granzymes and perforin.

Explanation:

Perforins are the proteins that perforate the plasma membrane of the target cell and lead to bursting of cells due to holes formed in its membrane. Granzymes are the proteolytic enzymes. They serve to stimulate the target cells to kill themselves by the process of apoptosis.

Binding of natural killer cells to their target cells stimulate the release of granules that are filled with perforins or granzymes to kill the target cells.

Likewise, cytotoxic T cells bind to the infected body cells and release the granules filled with perforins or granzymes to kill those infected cells.

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Which parts of the nitrogen cycle are involved in moving nitrogen from the atmosphere into the soil ?

Contact [7]

Nitrogen Fixation is the part of the nitrogen cycle that is involved in moving nitrogen from the atmosphere into the soil.

Explanation:

Nitrogen is said to be an essential one in the atmosphere but even though it exists as inactive in the atmosphere it is converted as usable nitrogen by the cycle.
The nitrogen cycle is considered to be one of the important factors for the survival of the plants. Nitrogen is not used directly in photosynthesis by the plants whereas it is converted to nitrate by the help of nitrogen-fixing bacteria in the soil.
Thus the nitrogen fixation process converts nitrogen into ammonium ions and then it is used by the plants.

8 0

4 years ago

_____ splits water into 1/2 O2, H , and e- . A structure of a thylakoid. Letters from A to E indicate definite structures. Lette

Sauron [17]

The luminous reactions begin when light reaches photosystem II. The water molecules provide electrons to the photosystem, releasing oxygen and protons. The letter A represents photosystem II that splits water.

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1. Luminous energy is trapped by chlorophyll in Photosystem II.

2. When the pigment molecules absorb light, electrons provided by water molecules get in a higher energy level.

3. The excited electrons go through the electron transport chain from Photosystem II to a less energetic level in photosystem I.

4. When the excited electrons leave photosystem II, they are replaced by new electrons extracted from the water molecules.

5. Luminous energy absorbed move the electrons from the photosystem I to another electron acceptor, from where they get transported again and used to produce NADPH molecules.

6. When electrons leave Photosystem I, they are replaced by new electrons coming from photosystem II.

7. When the water molecule breaks down, hydrogen ions remain in the thylakoid lumen, from where they are pumped to the stroma by the ATP synthase.

8. The released energy is used to produce ATP molecules.

9. Hydrogen ions go back from the stroma to the thylakoid compartment.

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6 0

3 years ago

Where did the scientists who contributed to our scientific knowledge live?

Musya8 [376]

may we have more context?

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3 years ago

This brought an end to the great West African empires.

Natalija [7]

Out of the choices given, enemy nations using sophisticated warfare to overpower the outdated tactics of the empire brought an end to the great West African empire. The correct answer is C.

3 0

4 years ago

Read 2 more answers

Anyone know the answers to this?

densk [106]

No because it doesn’t exist you put no photo. I can help if you tell me in comments tho

6 0

3 years ago

Read 2 more answers