Isotopes of an element have the same ________, but different ________
A) number of electron shells; numbers of protons
B) atomic number; atomic masses
C) number of neutrons; numbers of protons
D) atomic mass; atomic numbers
E) name; chemical symbols
B
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A heterozygote has
A) two different alleles for a gene. B) only one allele for a gene. C) an extra genome. D) one copy of each sex chromosome.
What is true of exercise and aging? a. Tendons stiffen with age but are no more likely to tear
b. Strength training slows age-related loss of muscle tissue. c. Exercise stimulates the addition of new muscle fibers in people of all ages. d. Exercise causes muscle mass to increase in old people as much as in younger ones.
Do any of the dinosaurs appear to be omnivores?
a. Yes b. No
The usual F2 phenotypic ratio of a dihybrid cross is
a. 1:1. b. 2:1. c. 9:3:3:1. d. 1:2:1. e. 3:1.