Restriction enzymes are mainly derived from:

A) fungi. B) animal cells. C) yeast. D) bacteria.


Answer: D

Biology & Microbiology

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Considering the catabolite repression mechanism, which observation would make you suspect it is NOT occurring?

A) CRP bound to promoter sites B) elevated levels of transcripts for maltose and sucrose catabolism C) relatively low intracellular cyclic AMP levels D) RNA polymerase bound to biosynthetic promoter sequences

Biology & Microbiology

Smooth endoplasmic reticulum is involved in protein synthesis

Indicate whether this statement is true or false.

Biology & Microbiology

The analysis of energy flow in an aquatic ecosystem in Silver Springs, Florida revealed that ____

a. energy flows are difficult to measure b. most of the sun's energy is harvested c. only a little energy is transferred from one trophic level to the next d. the energy flow in carnivores is equal to that of producers e. trophic energy losses are not significant

Biology & Microbiology

In the DNA isolation process, detergent was used to stabilize

a. the cellular and nuclear membranes. b. emulsify cellular and nuclear membranes. c. homogenize the cellular and nuclear membranes. d. neutralize the cellular and nuclear membranes. e. liquify the cellular and nuclear membranes.

Biology & Microbiology