The egg-bearing structure of a flower is the
A. anther.
B. sepal.
C. stigma.
D. style.
E. ovary.
E. ovary.
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Which of the following nucleic acid elements
is thought that viruses might have evolved from?
a. mRNA b. introns c. transposons d. mitochondrial DNA e. exons
A graduate student is studying the feeding behavior of a small octopus that must be laboriously collected from the shores of a remote island. Her intern wishes to do experiments to look at the octopus’s mating behavior. Why might the graduate student veto this idea?
A. The octopus has semelparous reproduction, and will eat its mate. B. The octopus has iteroparous reproduction, and will eat its mate. C. The octopus has semelparous reproduction, and will die after laying one batch of eggs. D. The octopus has iteroparous reproduction, and will die after laying one batch of eggs.
The carotid bodies detect carbon dioxide in the blood and is, therefore, a
a. chemoreceptor. b. photoreceptor. c. thermoreceptor. d. mechanoreceptor. e. movement receiver.
In the 1940s, proteins were thought to be the more likely molecules to house genetic information. What was the primary reason that DNA was not originally believed to be the genetic material?
(a) DNA has a high density of negative charges. (b) Nucleotides were known to be a source of chemical energy for the cell. (c) Both protein and nucleic acids were found to be components of chromosomes. (d) DNA was found to contain only four different chemical building blocks.