Animals that are able to rely on diffusion of
gases tend to
a. be small.
b. be large.
c. have all cells close to the body surface and
digestive cavity.
d. be both a and c.
e. be both b and c.
D
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Key sequences exist within promoters, which vary somewhat among various promoters but are sufficiently constant that they can be represented by a sequence of bases most often found at each position. These representations are called ________ sequences.
A. convergence B. consensus C. idealized D. common
The final by-products of many condensation
reactions are a. carbon dioxide molecules. b. hydrogen ions. c. hydroxyl ions. d. oxygen gas and hydrogen gas. e. water molecules.
Ectothermic animals
a. commonly have fur or feathers to minimize heat loss. b. shun the sun during the daylight hours. c. are more adapted to cold. d. use behavioral adjustments for temperature regulation. e. fit all of these descriptions.
In a set of classic experiments performed in the early 1950s, Urey and Miller subjected an experimental system composed of H2, CH4 (methane), and NH4 (ammonia) to electrical sparks. A few days later, they found ________________ in their system.
a. cells b. rRNA c. DNA d. tRNA e. amino acids