The condition known as microbial antagonism may be defined as
A) microorganisms that remain with a person throughout life.
B) a relationship between two organisms where one member harms the other.
C) a relationship between two organisms where only one member benefits.
D) an unsuccessful microbial invasion due to the presence of preexisting microbes.
E) a relationship between two organisms where both members benefit.
D
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The enzyme telomerase is essential for unlimited cell division because
A) it is essential for DNA replication initiation at origins of replication. B) a lack of telomerase will result in chromosome shortening and cell death. C) it is essential for kinetochore attachment to the spindles. D) a lack of telomerase results in decreased p53 activity.
Consider a typical food chain. Which level would be at the greatest risk of suffering from exposure to
a toxin based on the concept of biological magnification? What will be an ideal response?
Some genes, such as the human ABO blood groups, have more than two alleles. For these genes:
a. a greater proportion of the individuals must be heterozygous than homozygous. b. some individuals can be triply heterozygous. c. normal dominance relationships are not possible. d. individuals can only possess two alleles. e. All of the above are correct
Any gene located on a sex chromosome
A) is called a recessive gene. B) is called a sex-linked gene. C) will exhibit pleiotropy. D) will exhibit codominance.