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

Biology & Microbiology

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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.

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

Ground tissue is found in the primary plant only, never in the secondary plant

Indicate whether the statement is true or false

Biology & Microbiology