The primary reason that Earth experiences seasons is because of the:a
Earth's rotation.
b. Earth's orbit.
c. Earth's tilt on its axis.
d. unequal thickness of the Earth's atmosphere.
e. different layers of the Earth's atmosphere.
c
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During normal DNA replication, part of the DNA at the ends of linear chromosomes is not copied into
the new DNA strands because
a. DNA ligase cannot join pieces at the end of a chromosome. b. RNA primers at the beginning of a new strand cannot be replaced with DNA. c. those ends are Okazaki fragments that are lost. d. cells do not need the DNA at the ends of chromosomes. e. the ends of chromosomes are made of protein, not DNA.
A solution with a pH of 8 has how many times
fewer hydrogen ions than a solution with a pH of 6?
a. 2 b. 5 c. 10 d. 100 e. 1,000
What occurs in a missense mutation?
a. All of the amino acids beyond the mutation point are changed. b. A nucleotide is added to the DNA. c. A nucleotide is deleted from the DNA.
d. A single amino acid is substituted for another in a protein. e. The protein is always completely nonfunctional.
Darwin used the phrase struggle for existence to describe the competition among organisms for the resources needed to survive. What condition would increase the struggle for existence experienced by members of a population?
a) All of the other answer choices b) an increase in the population's food supply c) an increase in the size of the population's environment d) an increase in birth rate among members of the population