The Mesozoic era lasted from
A. 65 million years ago to 2 million years ago.
B. 500 million years ago to 250 million years ago.
C. 250 million years ago to 65 million years ago.
D. 540 million years ago to 250 million years ago.
E. one billion years ago to 500 million years ago.
Answer: C. 250 million years ago to 65 million years ago.
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The tongue length of an animal is controlled by two alternative alleles at a single locus, L (long) and l (short). If an individual has parents that are both homozygous dominant, it will be
A) homozygous dominant with a long tongue. B) heterozygous with a long tongue. C) heterozygous with a short tongue. D) homozygous recessive with a long tongue.
The "world is green" hypothesis advocates which mechanism?
A) bottom-up control B) top-down control C) the null model D) diffuse competition
Which of the following does not contain sugars?
A.) glycoproteins B.) steroids C.) glycolipids D.) cellulose E.) nucleotides
A gene is said to be poised if it
a. is inactive. b. has an assembled basal apparatus but requires a second signal for activation. c. has a partially assembled basal apparatus. d. is active. e. is prevented from being expressed by chromatin structure.