Some RNA molecules can function like enzymes. These particular enzymatic RNA molecules are called
A) ribosomes.
B) mRNA.
C) ribozymes.
D) RNase.
Answer: C) ribozymes.
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When ventricles are full of blood, the ____ valves are closed
a. atrioventricular b. aortic c. pulmonary d. aortic and pulmonary e. atrioventricular and aortic
The mammalian circadian pacemaker is located in the
A. hippocampus. B. somatosensory cortex. C. adrenal gland. D. brainstem. E. suprachiasmatic nucleus.
Receptor-mediated endocytosis:a
is a passive process. b. involves only membrane transport proteins. c. brings about the selective uptake of materials by enclosing them in membranous vesicles. d. does not require energy. e. is most likely to be found in cells that release large amounts of hormones.
________ is a product of the liver. It contains water, ions, cholesterol, pigments, and salts that help in the digestion of lipids
Fill in the blank(s) with correct word