Integrins are glycoproteins that help link the cytoskeleton and the:
A. ribosomes.
B. cytoplasm.
C. cell wall.
D. extracellular matrix.
Answer: D
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Diatoms require silicon due to their
A) Ca2+/Si4+ symporters. B) DNA replication mechanism. C) ornate frustules. D) unique phototrophic physiology.
The neural control centers for the heart ____
a. are primarily stimulatory b. are found in the spinal cord and brain c. influence only heart rate
d. stimulate heart rate and decrease contraction strength e. play a minor role in cardiovascular feedback
In which of the following groups are most mRNAs monocistronic?
A) bacteria B) archaea C) eukarya D) bacteria and archaea E) All mRNAs are monocistronic.
An Rh-negative mother will need a special treatment if she gives birth to an Rh-positive baby. The treatment involves the destruction of any stray blood cells from the baby that pass into the mother's bloodstream. Why is this necessary?
A) Without this treatment, the mother's immune system will attack only her own blood cells. B) Without this treatment, antibodies will be formed in breast milk, which could harm the baby. C) The mother's immune system will attack the Rh-positive cells and produce antibodies that will attack a fetus in a subsequent pregnancy. D) The mother's immune system will attack her own blood cells and the cells in the fetus of a subsequent pregnancy.