In a cell-mediated immune response, how does a helper T cell activate cytotoxic T cells?

a. antibodies
b. cytokine signaling
c. receptor signaling
d. via cross-talk with macrophages
e. neural signaling


b

Biology & Microbiology

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The hypothesis that mitochondria and chloroplasts originated from the phagocytic activity of prokaryotes that was not

followed by digestion is called the ____.

a. theory of natural selection b. endosymbiotic hypothesis c. ribozymes-first hypothesis d. Oparin-Haldane hypothesis e. stromatolite hypothesis

Biology & Microbiology

Which of the following parts of the nervous system is closest to a muscle?

A) neuron B) interneuron C) motor neuron D) neuroglial cell

Biology & Microbiology

How were ancient peoples involved in biotechnology?

What will be an ideal response?

Biology & Microbiology

You are studying regulation of a prokaryotic operon. Experiments show that expression of the operon is increased when levels of biosynthetic product from that pathway are low. Based on this information, what is a likely mode of regulation?

A. The product binds a repressor, allowing it to bind the operator. B. The product binds a repressor, preventing it from binding the operator. C. The product binds an activator, helping RNA polymerase to bind the promoter. D. The product binds to the biosynthetic enzymes, blocking them directly.

Biology & Microbiology