According to the competitive exclusion principle, two species cannot continue to occupy the same _____
A) habitat
B) niche
C) territory
D) range
E) biome
Answer: B
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By the eighth week of human fetal development, ____
a. the embryo does not look human yet b. the neural tube has just begun to differentiate c. upper and lower limbs have formed, but individual fingers and toes have not begun to differentiate d. male or female reproductive structures have not started to form yet
e. male or female reproductive structures are formingCytoplasmic extensions by which some protozoa move are
A. cilia. B. flagella. C. pseudopodia. D. All answers are correct. E. pili.
For the polymerase chain reaction to occur, ____.
A. the reaction temperature must be cycled from low to high B. all DNA fragments must be identical C. the DNA must remain double stranded D. a sticky end must be available for the ligase enzyme to function E. a large sample of DNA is needed
Which of the following statements regarding sexual and asexual reproduction is true?
A) Cell division only occurs after sexual reproduction. B) Only offspring from asexual reproduction inherit traits from two parents. C) Sexual reproduction typically includes the development of unfertilized eggs. D) Sexual reproduction is more likely to increase genetic variation than is asexual reproduction.