Red algae ____
a. are primarily marine organisms
b. are thought to have developed from green algae
c. contain xanthophylls as their main accessory pigments
d. are actually brown
e. are primarily freshwater organisms
ANSWER: a
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The phylogeny below represents a hypothesis for the evolutionary relationships among major groups of plants. If it is correct, in what order should we predict to find the fossils of these groups, in order from oldest to youngest?
A. flower group, conifer group, ferns, moss group B. conifer group, ferns, moss group, flower group C. ferns, moss group, conifer group, flower group D. moss group, ferns, daisy E. ferns, conifer group, moss group
At pH 7, a peptide with the sequence G-M-G-V-S-D-P-D-A has a net charge of:
A. -3 B. -2 C. -1 D. +1 E. +2
Genes organized into an operon are beneficial to certain bacteria because the operon allows for
A. differential regulation of individual genes that encode proteins with a common function. B. coordinated regulation of a group of genes that encode proteins with a common function. C. separate regulation of individual genes that encode proteins with different functions. D. coordinated regulation of a group of genes that encode proteins with different functions. E. coordinated regulation of a group of proteins involved in numerous cellular activities.
The major difference between the human male and female reproductive systems is the
a. provision of a site for fertilization and embryo development in the female. b. production of haploid gametes only by the male. c. diploid polar bodies of the female. d. generation of millions of eggs but only thousands of sperm each month. e. presence of a duct system opening to the body's exterior only in females.