In Mendel's pea plants, yellow seeds are dominant to green seeds. Purple flowers are dominant to white flowers. Use Y and y for the seed color alleles and P and p for the flower color alleles. Flower color and seed color assort independently. If a plant
that is heterozygous for both flower color and seed color genes is self-fertilized, what proportion of the offspring will have one of the dominant phenotypes, either the seed color or flower color, but not both?
A) 9/16 B) 9/32 C) 6/64 D) 6/16 E) 6/32
Answer: D
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Which animal makes human interleukin-2, a protein that triggers immune cells to divide and is being used as a cancer
drug?
a. cowsb. sheep c. mice d. goats e. rabbits
Four of the five organisms listed below do not have
vascular tissue. Select the exception. a. ferns b. liverworts c. mosses d. hornworts e. algae
Runners are modified stems that resemble roots and
are also known as a. stolons. b. rhizomes. c. bulbs. d. corms. e. tubers.
What is the key factor determining whether or not attenuation will occur when transcription of the E. coli trp operon has been initiated?
A. The trp operon repressor B. The activity level of adenyl cyclase C. The level of tryptophan in the environment D. The level of trp-tRNA that is charged with tryptophan