The mass number of an atom is:
A. the number of neutrons only
B. the number of protons plus the number of neutrons
C. the number of electrons plus the number of protons
D. the number of electrons, plus the number of neutrons, plus the number of protons
E. the number of protons only
Answer: B
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A man inherited a chromosome with a deletion that removes a tumor-suppressor gene. The protein encoded by this gene normally functions in DNA damage repair. Which series of events would be most likely to lead to cancer?
A) Loss-of-heterozygosity of the tumor-suppressor gene followed by driver mutations in two different proto-oncogenes B) A loss-of-function mutation in a proto-oncogene followed by a gain-of function mutation in a tumor-suppressor gene C) Loss-of-heterozygosity of the tumor-suppressor gene followed by passenger mutations in several genes of unknown function D) A gain-of-function mutation in a proto-oncogene followed by a chromosomal duplication of a region including a tumor-suppressor gene that functions the G1-to-S checkpoint
The molecule that connects a growing polypeptide chain and mRNA is called:a
tRNA. b. RNA polymerase. c. rRNA. d. a promoter. e. a ribosome.
Which is the correct series of events in the evolution of life on Earth?
A) O2 ? aerobic metabolism ? photosynthesis B) Photosynthesis ? O2 ? aerobic metabolism C) Aerobic metabolism ? photosynthesis ? O2 D) O2 ? photosynthesis ? aerobic metabolism
The kidneys excrete metabolic wastes, including urea, a by-product of glucose metabolism.
Answer the following statement true (T) or false (F)