Individuals with xeroderma pigmentosum inherit a faulty DNA repair mechanism. As a consequence,
they
a. are sterile.
b. have no proofreading during DNA replication.
c. cannot join the Okazaki fragments produced during DNA replication.
d. easily develop skin cancer when exposed to sunlight.
e. lose part of the DNA on the ends of chromosomes during each round of DNA replication.
D
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Rod cells differ from cone cells in that
a. rod cells respond to changes in light intensity, and cone cells detect very dim light. b. rod cells contain pigments which enable the perception of color, and cone cells respond to changes in light intensity. c. rod cells respond to changes in light intensity, and cone cells contain pigments which allow for the perception of color. d. rod cells are responsible for acute daytime vision, and cone cells detect very dim light. e. they are none of these.
Which of the following has been found in
association with the K-T boundary layer?
a. iridium b. shocked quartz c. tektites d. all of these e. none of these
Which of the following reservoirs holds the most carbon?
a. marine sediments b. ocean water c. plant biomass d. the atmosphere e. fossil fuel
Oparin and Haldane's hypothesis states that the
A. Earth's early atmosphere contained 02. B. first organic macromolecules originated in Earth's early atmosphere. C. first cells were autotrophs. D. first cells originated in the oceans.