What type of cell is the Cas9 enzyme naturally found in?

A) plant
B) animal
C) prokaryote
D) fungi


Answer: C

Biology & Microbiology

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One advantage of angiosperm seeds is the presence of seed ____, a nutritive tissue produced during fertilization that nourishes the developing embryo.

a. a coat b. endosperm c. ovule d. pollen sac e. ovary

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Which of the following carries amino acids to

ribosomes, where amino acids are linked into the primary structure of a polypeptide? a. mRNA b. tRNA c. hnRNA d. rRNA e. all of these

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Which of the following sequences indicates the promoter region of a gene?

a. CAAT b. UAAG c. CTTT d. ACAT e. TAAC

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What happens when cells cannot repair the damage caused by a mutagen?

a. the organism is not affected b. the organism is affected temporarily c. the DNA base sequence is not affected d. the DNA base sequence changes permanently

Biology & Microbiology