_______ are the simplest animals, being little more than tubes of cells that filter microscopic pieces of food from the water.
a) chordates
b) nematodes
c) cnidarians
d) sponges
Answer: d) sponges
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Synthetic anabolic steroids:
A. All of the answer options are correct. B. promote protein synthesis. C. promote anabolic metabolism to store energy within cells. D. build and strengthen muscle tissue. E. interfere with the normal production of anterior pituitary tropic hormones.
The species richness of insects on trees can be predicted by which of the following?
A. The area hypothesis B. The evapotranspiration rate C. The average body size of insects D. The species-time hypothesis
Which of the following occurs in prophase??
a. sister chromatids attach
b. DNA replicates
c. chromosomes align in the middle of the cell
d. the nuclear envelope breaks down
e. sister chromatids separate
Riboswitches exert effects on ________ whereas repressors and inducers exert effects on ________.
A. replication; translation B. translation; transcription