Natural form of passive immunity involves the transfer
A) IgA antibodies to an infant through the mother's milk.
B) IgG antibodies to an infant through the mother's milk.
C) IgG antibodies by kissing.
D) IgE antibodies by sneezing.
E) IgA antibodies across the placenta.
Ans: A) IgA antibodies to an infant through the mother's milk.
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Mammals may ____ as a response to cold in order to limit the amount of heat lost to the surroundings
a. shiver b. go off to lay alone so that others do not take their heat c. press hair shafts close to the body d. reduce blood flow to the skin e. lose brown adipose tissue
Assuming incomplete dominance, if a homozygous red-flowered plant is crossed with a homozygous white-flowered plant, what will be the color of the offspring?
A) Red B) White C) Pink D) Red and white
Please match the types of mutations with the statements that most accurately describe them, to test your understanding of their causes.
Induced mutation A) Random change in the DNA arising from errors in replication that occur without a known cause B) Result from exposure to known mutagens, which are primarily physical or chemical agents that damage DNA C) Changing of single base in the DNA code that may result in the placement of a different amino acid D) Addition or deletion of bases that changes the reading of mRNA codons
Although Burkholderia cepacia could be very useful in bioremediation programs, it is not feasible to use it. Why?
A. Because it can cause opportunistic infections in the respiratory tract. B. Because it cannot be cultured in the lab to necessary numbers. C. Because it is too expensive at this time to grow it. D. It encourages the overgrowth of fungus in the environment, which is not desirable. E. It produces a foul odor making it a poor choice for most situations.