BRCA1 and BRCA2 are considered to be tumor-suppressor genes because _____
A) they prevent infection by tumor viruses that cause cancer
B) their normal products participate in repair of DNA damage
C) the mutant forms of either one of these prevent breast cancer
D) the normal genes make estrogen receptors
E) they block penetration of breast cells by chemical carcinogens
Answer: B
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A naked virus only has a/an ________.
A. nucleocapsid B. capsomere C. antigenic surface D. envelope
Which of the following is defined as "heat content"?
A) energy output B) heat loss C) entropy D) solar radiation E) enthalpy
Which of the following is an endotherm?
a. a shark c. a monkey b. a frog d. a snake
Neurospora is an ideal organism to study the effects of genetic mutations because of several reasons. What is one of
these? a. Neurospora is a small mammal. b. Neurospora grows as a diploid organism. c. Neurospora requires a medium supplemented with only a few nutrients that it cannot manufacture on its own. d. Neurospora mutant strains that cannot make a particular amino acid can still grow if that amino acid is added to the growth medium. e. Neurospora contains homologous chromosomes that are easily viewed with a light microscope