The sipunculid worms are also called:
a. peanut worms.
b. lugworms.
c. innkeeper worms.
d. fanworms.
e. beardworms.
A
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What stimulates a muscle cell to contract?
A. an impulse from a sensory neuron B. an impulse from a motor neuron C. auto-depolarizing cells in the membrane of muscle cells D. hormones
In humans, telomerase ____
a. adds telomere repeats in some human cells b. removes telomere repeats in all human cells c. adds telomere repeats in all human cells d. removes telomere repeats in some human cells e. transcribes telomere repeats in some human cells
Most null cells are destined to become what type of cell?
A) mast cells B) plasma cells C) effector cells D) natural killer cells (NK cells) E) dendritic cells
The animal gut cavity may be a fully lined coelom or a partially lined __________.
Fill in the blank(s) with the appropriate word(s).