The linear DNA fragments taken up from disrupted infective cells recombine with the chromosomal DNA of the
noninfective cells by ____, much in the same way as genetic recombination takes place in conjugation.
a. meiosis
b. metaphase II
c. nuclear division
d. crossovers
e. transformation
ANSWER: d
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If pollen of one species of plant lands on the stigma from another species, then ________
a. it binds but does not germinate b. a hybrid plant is produced that may or may not survive c. it germinates but the sperm will not fertilize the egg d. it does not bind because it lacks the proper recognition proteins
Which of the following statements is NOT true about the debate over the nature of genetic material?
A. Many scientists believed that DNA was not the genetic material because, with only four types of nucleotides, DNA did not have enough variability to store information. B. Some scientists thought that RNA was likely to be the genetic material. C. Scientists focused on carbohydrate and protein in their studies of possible genetic material since they knew that genes were on chromosomes and that chromosomes were made of carbohydrate and protein. D. Many scientists thought that proteins had a greater capacity for storing information because proteins contain 20 amino acids that could be sequenced differently.
A carrier of a genetic disorder who does not show symptoms is most likely to be ________ to transmit it to offspring
A) heterozygous for the trait and able B) heterozygous for the trait and unable C) homozygous for the trait and able D) homozygous for the trait and unable
One division of the autonomic nervous system, called the ________ nervous system, is active in times of stress.
Fill in the blank(s) with the appropriate word(s).