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
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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.
Explain why we say nearly all life on Earth ultimately depends on the sun for energy
What will be an ideal response?
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
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.