Fossils include
a. skeletons.
b. shells.
c. seeds.
d. tracks.
e. all of these.
Answer: e
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Although symbiotic relationships between nitrogen-fixing bacteria and plants are rare, many plants have symbiotic relationships with
A. other plants. B. nematode worms in the soil. C. filamentous algae. D. mycorrhizal fungi in the soil. E. soil insects.
Some scientists believe that RNA was the first information storage molecule because ____
a. some viruses use RNA as their information storage molecule b. RNA can be an enzymatic catalyst as well as an information storage molecule c. amino acids cannot form peptide bonds without ribosomes to catalyze their formation d. RNA is a less stable molecule than DNA e. proteins are made of far more amino acid monomers (over 20) than RNA (4)
Differential survival and reproduction of individuals of a population that vary in the details of shared traits is called
____________________. Fill in the blank(s) with the appropriate word(s).
Estrogen and progesterone exhibit which type of hormone interaction?
a. synergistic b. permissive c. opposing d. unrelating e. mutual