Enzymes that cleave DNA at specific sites are called ________.
A. restriction endonucleases
B. DNAses
C. peptidases
D. vectors
Answer: A
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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
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
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
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.