Heterospory was an important evolutionary development, as it led to the evolution of:
a. pollen.
b. eggs.
c. xylem.
d. phloem.
e. seeds.
E
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Why can corn seeds germinate in total darkness?
A. The seed coating absorbs water. B. Seeds are heterotrophic and can capture nutrients from the soil. C. The endosperm provides the embryo with the nutrition needed during the initial germination stages. D. Soil microbes degrade the seed coating allowing the seed to germinate.
Four of the five answers listed below are produced by the same germ layer. Select the exception
a. nervous system b. muscle system c. circulatory system d. reproductive system e. urinary system
Testosterone and other androgens are required for ______ in men.
A. spermatogenesis B. primary sex characteristics C. secondary sex characteristics D. two of the above E. all of the above
Which of the following methods used to study proteins is limited to proteins with a molecular mass of 50 kD or less?
(a) X-ray crystallography (b) fingerprinting (c) nuclear magnetic resonance (d) mass spectroscopy