What cell type kills cells infected by a virus as part of the specific immune response?

A) macrophages
B) mast cells
C) cytotoxic T cells
D) natural killer cells
E) helper T cells


Ans: C) cytotoxic T cells

Biology & Microbiology

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The loop of Henle in the nephrons of desert-dwelling kangaroo rats is much longer than the loop of Henle in humans. What is the advantage of this increased length for the kangaroo rat?

A. A longer loop of Henle can generate a larger concentration gradient, which allows for the production of a more concentrated urine. B. A longer loop of Henle can generate a smaller concentration gradient, which allows for the production of a more concentrated urine. C. A longer loop of Henle can generate a larger concentration gradient, which allows for the production of a less concentrated urine. D. A longer loop of Henle can generate a smaller concentration gradient, which allows for the production of a less concentrated urine. E. None of the answer options is correct.

Biology & Microbiology

Explain why we say nearly all life on Earth ultimately depends on the sun for energy

What will be an ideal response?

Biology & Microbiology

What carries the signal between a neuron sending a message and the neuron receiving it?

a. threshold value b. action potential c. neurotransmitter d. neurohormone e. resting potential

Biology & Microbiology

Which of the following best describes mollusks?

A. They are bilaterally symmetrical and have a soft body always covered with a shell. B. They have radial body symmetry and a soft body always covered with a shell. C. They have radial body symmetry and a soft body sometimes covered with a shell. D. They are bilaterally symmetrical and have a soft body sometimes covered with a shell.

Biology & Microbiology