Which of the following is a morula?
A) a hollow sphere of cells B) the group of cells that form the archenteron
C) a tightly packed ball of early embryonic cells D) a fertilized egg
Answer: C
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Plain soap is very effective in controlling spread of microorganisms because it is
A. bacteriostatic. B. very effective at the mechanical removal of microorganisms. C. virucidal. D. bactericidal.
Which of the following could be a potential consequence of unchecked human population growth?
a. famine in areas that are densely populated b. drought in areas that are sparsely populated c. fewer diseases in densely populated areas d. enhanced resource availability in populated areas
Growth at two replication forks arising from a single origin of replication produce a "bubble" as daughter DNA molecules form.
Answer the following statement true (T) or false (F)
Which endocrine gland is the main center for control of the internal environment?
A. Pineal B. Hypothalamus C. Thyroid D. Adrenal cortex E. Thalamus