An individual described as heterozygous has a _____.
A) pair of identical dominant alleles
B) pair of nonidentical alleles
C) pair of identical recessive alleles
D) phenotype that clearly indicates the genotype
Ans: B) pair of nonidentical alleles
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You are studying two traits in fruit flies: 1. eye color where there are two colors, brown and red 2. wing shape where there are straight and curled phenotypes
You mate two flies that are heterozygous for the genes that control both of these traits and get the following phenotypes in the following ratio: 9 red and straight; 3 red and curled; 3 brown and straight; 1 brown and curled Which phenotypes are dominant? What will be an ideal response?
The antibiotics streptomycin and erythromycin work by inhibiting the function of ____ in bacteria but not eukaryotes
a. RNA polymerases b. aminoacyl-tRNA synthetases c. spliceosomes d. DNA polymerases e. ribosomes
Natural or man-made substances released into soil, air, or water in greater than natural amounts are called:
a. acids b. pollutants c. nutrients d. metals e. chemicals
The two photosystems of light reactions are
designated a. type 1 and type 2. b. type I and type II. c. photosystem A and photosystem B. d. photosystem 680 and photosystem 700. e. photosystem I and photosystem II