Which of the following was demonstrated by the Miller-Urey experiment?
A. Life began in the oceans.
B. Life can be started experimentally in the laboratory.
C. Organic molecules important to life could have been formed from a vast array of simple chemicals.
D. Life began on the pre-biotic Earth 3.5 billion years ago.
C. Organic molecules important to life could have been formed from a vast array of simple chemicals.
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Follicle-stimulating hormone (FSH) and luteinizing hormone (LH) are produced by the
A. pancreas. B. anterior pituitary gland. C. pineal gland. D. hypothalamus. E. posterior pituitary gland.
DNA polymerase
a. is an enzyme. b. adds new nucleotides to a strand. c. proofreads DNA strands to see that they are correct. d. derives energy from free nucleotides for strand assembly. e. is all of these
The process illustrated in the accompanying figure is called:
a. peristalsis.
b. hydrolysis.
c. emulsification.
d. proteolysis.
e. diffusion.
In yolk-rich eggs, cytoplasmic localization of the yolk results in which of the following?
A. Yolk proteins concentrated at the animal pole B. More cuts in the yolky part C. Genetic material confined to the nucleus D. Fewer cuts during cleavage in the vegetal pole E. Reduced cytoplasm from the sperm