All macromolecules that are important in living systems contain:
A) nitrogen.
B) potassium.
C) aldehydes.
D) carbon.
E) polymers.
D) carbon.
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Frameshift mutations (select all that apply)
A. cause the insertion or deletion of a single amino acid from the polypeptide chain. B. result in premature stop codons. C. change the entire amino acid sequence downstream from the site of the insertion or deletion. D. are known risk factors in most forms of cancer, including breast and colon cancer. E. are known risk factors in breast cancer, but not colon cancer.
The liver filters which of the following from the blood?
A) toxins B) chyme C) hepatocytes D) glycogen
Why are some reactions exothermic?
A) The products have lower potential energy than the reactants. B) They are spontaneous. C) They are not spontaneous. D) The products have higher entropy than the reactants.
The mammalian circadian pacemaker is located in the
A. hippocampus. B. somatosensory cortex. C. adrenal gland. D. brainstem. E. suprachiasmatic nucleus.