Earth has not been visited by aliens, according to your textbook

a. True
b. False
Indicate whether the statement is true or false


True

Biology & Microbiology

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What type of sensory receptors function in balance and sensing gravity?

A. mechanoreceptors B. photoreceptors C. nociceptors D. chemoreceptors

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LUCA, the last universal common ancestor, is:

A. a prehistoric protozoan cell. B. an embryonic cell (in fetus). C. the simplest bacterial cell. D. a cell from which all organisms descended.

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Although most of the mechanisms of evolution are nonrandom, the one that is absolutely random is ________

A) sexual selection B) natural selection C) artificial selection D) genetic drift

Biology & Microbiology

Which of the following transgenic techniques requires linker proteins?

A) Embryonic stem cell method B) Retrovirus-mediated method C) Pronuclear injection method D) Sperm-mediated transfer method E) Plasma cell membrane fusion method

Biology & Microbiology