Sickle-cell anemia has been traced to what type of mutation?
a. frameshift
b. transposable element
c. mutagenic
d. base-pair substitution
e. viral
D
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What is the main prerequisite for clearance at the G2 checkpoint?
a. cell has reached a sufficient size b. an adequate stockpile of nucleotides c. accurate and complete DNA replication d. proper attachment of mitotic spindle fibers to
Altruism can be distinguished from reciprocal altruism because altruism is defined as ____ but
reciprocal altruism involves ____.
a. the sacrifice of an individual's reproductive success to help others; the expectation of a future favor in return for present aid b. aid given to nonrelatives; benefits given to close relatives only c. the expectation of a future favor in return for present aid; close relatives helping each other d. low-risk behavior that provides minor benefits to others; high-risk behavior providing major benefits to others e. aid given to relatives; benefits given to nonrelatives only
Viral chromosomes exist in a variety of conformations and can be made up of ________
A) DNA only B) DNA, RNA, or protein C) protein- or lipid-coding sequences D) DNA or RNA E) RNA only
Refer to the accompanying figure. What is the function of the structure labeled as 6?
a. digestion b. food intake c. water discharge d. waste elimination e. asexual reproduction