One strand of DNA serves as a template for the synthesis of another so that __________.
A. the progeny of each cellular replication gets the same genetic information
B. there are two copies of each gene on a single DNA molecule
C. DNA can serve as a template for the synthesis of other polymers
D. the helical shape of DNA is conserved
A. the progeny of each cellular replication gets the same genetic information
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Ctenophores and Cnidaria both have nerve and muscle cells, but Ctenophores lack Hox genes that occur in both Cnidaria and Porifera. What is the most likely explanation?
a. Porifera diverge from a common ancestor before nerve and muscle cells evolved, then Cnidaria and Ctenophores absorbed viral genomes containing Hox genes from plasmids contained within their environment. b. Hox genes were deleted from the Ctenophore genome after Ctenophores diverged from a common ancestor with Cnidaria, and Porifera developed nerve and muscle cells. c. Hox genes developed in a common ancestor of Cnidaria and Porifera after it diverged from an ancestor in common with Ctenophores, then nerve and muscle cells developed via parallel evolution. d. Hox genes are produced by mitochondria; Porifera lack mitochondria, and therefore cannot contain Hox genes. The presence of nerve and muscle cells is entirely unrelated and irrelevant.
One of the problems associated with the control of virus-caused diseases is that they
A. cannot survive outside the host. B. have a complicated life cycle. C. have a rapid mutation rate. D. can infect many kinds of cells in many kinds of organisms.
Which of the following is a virus with an icosahedral head, a capsid that contains primarily three proteins, a connecting neck with a collar and long whiskers, a long tail and a complex base plate?
A. influenza virus B. tuberculosis C. measles virus D. HIV E. T4 bacteriophage
Mammalian appendages with similar bone structures can be used for flying, swimming, running, or grasping. These are examples of ________ structures
Fill in the blank(s) with correct word