Self-replicating DNA vectors used to transmit a gene into an organism can include
a. plasmids.
b. viruses.
c. antigen.
d. Both a and b
Answer: d. Both a and b
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Usually, an egg cell from a human female contains
a. one X chromosome and one Y chromosome. b. one X chromosome. c. one Y chromosome. d. two X chromosomes. e. two Y chromosomes.
Four of the five time periods listed below represent
milestones in the evolution of life on Earth. Select the exception. a. 12 to 15 billion years ago b. 3.2 billion years ago c. 2.1 billion years ago d. 570 million years ago e. 200 million years ago
What event is usually responsible for terminating signal transduction by RTKs?
a) degradation of the ligand b) phosphorylation of the receptor c) dephosphorylation of the receptor d) receptor internalization e) acetylation of the receptor
Ground tissue is found in the primary plant only, never in the secondary plant
Indicate whether the statement is true or false