Which birth control method avoids intercourse during fertile days?
a. rhythm method
b. withdrawal
c. vasectomy
d. tubal ligation
e. abstinence
ANSWER: a
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Which male organism contains two identical sex chromosomes?
a. turtles b. birds c. chimpanzees d. dogs e. lizards
Studies of sex chromosome aneuploidy reveal that ____ necessary for survival
a. the X chromosome is not b. the Y chromosome is not c. two copies of the X chromosome are d. two copies of the Y chromosome are e. at least one copy of both the X and the Y chromosome is
Consider three species (1, 2, and 3). It's known that species 1 and 3 were separated 10 million years ago based on geologic measurements
Genetic analysis at a neutral locus indicates that these species differ by 100 substitu-tions. If there are 10 substitutions separating species 1 and 2, how long ago did they diverge? a. 0.1 million years ago b. 1 million years ago c. 10 million years ago d. 100 million years ago e. cannot be determined based on the information provided
Which enzyme converts fibrinogen to fibrin
A. thrombin B. plasmin C. ADP d. factor X