Formation of menisci, such as occurs in a tube filled with water, is an important factor in plant water movement. A meniscus is created by _____
A) the upward pull of gravity on the water column in the tube
B) downward pressure from the atmosphere on the topmost layer of water molecules
C) the water molecules being pulled upward by adhesion to the air
D) the topmost layer of water molecules being pulled downward by the hydrogen bonds to the water molecules below
D
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Can a woman with blood type A have a child with blood type O with a man who is AB?
A) Yes, because of codominance between the IA and IB alleles. B) No, because a man with type AB blood could not contribute an i allele. C) Yes, because of epistasis between the I and the H genes. D) No, because the child's genotype must be ii.
Which population dispersion is the most common in nature?
a. random b. clumped c. uniform d. dynamic e. unpredictable
The severe diarrhea associated with cholera is brought about by
a. an associated virus. b. an enterotoxin. c. an exotoxin. d. a buildup of electrolytes. e. retention of water.
An RNA primer is synthesized by RNA primase
__________________ Indicate whether the statement is true or false.