Enzymes that cleave DNA at specific sites are called ________.

A. restriction endonucleases
B. DNAses
C. peptidases
D. vectors


Answer: A

Biology & Microbiology

You might also like to view...

Ultraviolet signals in swordtail fishes and electrical signals in weakly electrical fishes are examples of

____ communication.

a. network b. private channel c. sensory drive d. overheard e. sensory overdrive

Biology & Microbiology

The countercurrent exchange system found in fish gills maximizes gas exchange efficiency by:

a. producing rapid water flows across the gill surface. b. allowing water and blood to come in direct contact to maximize oxygen exchange. c. having the most oxygen-depleted blood come in contact with the most oxygen-rich water. d. having the most oxygen-depleted blood come in contact with the most oxygen-depleted water. e. decreasing the oxygen content of the blood leaving the gill filaments

Biology & Microbiology

Gram-positive bacteria would stain ____ in a gram stain because of a thick layer of ____ in their cell walls

a. green; cellulose b. red; polysaccharides c. green; peptidoglycan d. purple; peptidoglycan e. purple; polysaccharides

Biology & Microbiology

What is a key feature of an open circulatory system?

a. No vessels carry the blood. b. Open-ended vessels carry the blood. c. Closed vessels carry the blood. d. No heart pumps the blood. e. Hemoglobin is carried in the blood.

Biology & Microbiology