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Paha777 [63]
3 years ago
10

Which of the following is NOT a step used by cytotoxic T cells to kill infected host cells? a)Secretion of granzyme b)Recognitio

n of infected host cell using its TCR c) Secreting antibody specific against the pathogen. d) Secretion of perforin.
Biology
1 answer:
Ostrovityanka [42]3 years ago
7 0

Answer:

The correct answer is C

Explanation:

Cytotoxic cells are lymphocytes that kills or destroy cancerous cells, infected cells especially the one infected with virus, and damaged cells.

Cytotoxic cells does not secret antibodies to fight pathogens but the secret granzyme and perforin to kills infected cells.

They recognised their host cells by using their T cell receptors(TCR).

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Write down three interesting facts about the tasmainian devil,
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2 years ago
Question 112 pts Choose the word/phrase from the right to complete the statement on the left. Choices may be used once, more tha
Vlad [161]

Answer:

The correct answer is -

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2. Eubacteria cell wall contains peptidoglycan which is composed of sugar and amino acids.

3. Eukaryotic cells have membrane-bound nucleus or organelles. which distinguishes it from prokaryotic cells.

4. All archaea domain organisms found in extreme conditions such as halophiles, extremophiles, and thermophile.

5. The cell wall of the plant is made of cellulose, a polymer of glucose units.

6. Eubacteria are considered to be the first living organism or form found on earth.

7. Fungi cell walls are made up of a chitin cell wall. which is makes it different from eubacteria and plants.

8. Fungi uses absorption to obtain nutrients. Most of the fungi uses haustaurium to absorb nutrients.

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10.plants are classifies as autotrophs because they make their own food.These autotrophs serve as primary producers.

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2 years ago
Which of the following statements is TRUE?
AlexFokin [52]

Answer: B (GTP serves as the energy input for AMP synthesis from IMP)

Explanation:

In the de novo synthesis of purine nucleotide, IMP represents a branch point for purine biosynthesis. IMP can be converted to either AMP or GMP.

The formation of AMP from IMP requires GTP; similarly formation of GMP requires ATP. The conversion of IMP to either AMP or GMP is highly regulated – AMP and GMP inhibits their own formation by feedback inhibition of adenlyosuccinate synthetase and IMP dehydrogenase.

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3 years ago
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