Proteins isolated from bacteria and used in recombinant DNA technology to cut DNA at specific sequences are
A) restriction enzymes.
B) bacteriophage enzymes.
C) plasmids.
D) methylating enzymes.
A) restriction enzymes.
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The structure indicated by the letter “B” above
represents a. actin. b. myofibril. c. myosin. d. sarcoplasmic reticulum. e. muscle fiber.
In the human knee-jerk reflex of a seated individual, as the calf is raised from a vertical position to a horizontal position, the muscles of the quadriceps (on the front of the thighs) and the muscles of the hamstring (on the back side of the thighs
) are _____. A) both excited and contracting B) both inhibited and relaxed C) excited and inhibited, respectively D) inhibited and excited, respectively
Which hypothesis is most likely to be productive for their initial investigation?
A) The nucleotide chain of the enzymes may be incorrectly formed. B) The dye in the fabric may have hydrolyzed the fatty acids in the enzymes. C) The three-dimensional structure of the proteins may have been altered. D) There may not have been enough phospholipids for the volume of fabric.
When you are breathing normally, exhalation results mainly from
A) the contraction of muscles in the chest. B) the contraction of the diaphragm. C) the relaxation of the diaphragm and muscles between the ribs. D) low pressure in the lungs.