Using gene knockout organisms can reveal the function of a gene by
A.) rearranging the sequence of an organism's genes.
B.) showing the effect of turning off a gene.
C.) comparing the DNA fingerprint of two organisms.
D.) distinguishing between an original organism and its clone.
Answer: B.) showing the effect of turning off a gene.
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Freshwater sponges reproduce asexually by forming resistant internal buds called
(a) spicules. (b) larvae. (c) ovaries. (d) gemmules.
Sea turtles are likely to die when they are young, but have a good chance of surviving once they reach
large size. Which survivorship curve best fits them?
a. Type I, which is graph A b. Type II, which is graph B c. Type I, which is graph C d. Type III, which is graph C e. Type III, which is graph A
Energized myosin heads bind to actin only when ____ is present
a. myosin b. AMP c. calcium d. ATP e. sodium
Fossils
a. are found in underground layers of rock. b. are distributed underground, with the oldest forms near the top. c. have more complex structures the deeper they are buried. d. are the same throughout the world no matter where they are found. e. that are most like living organisms are found deepest in the ground.