Explain why a pregnant woman should not have an abdominal X-ray and identify the possible consequences to the
fetus if she does. What will be an ideal response?
ANSWER: Pregnant women should avoid all unnecessary X-rays. Radiation, especially medical X-rays,
can be a teratogen. The human embryo is most sensitive to teratogens during the early stages
of pregnancy. Large doses of radiation during weeks 2 –18 can affect the brain and central
nervous system and significant radiation exposure before birth can increase the risk of cancer
later in life. Pregnant women should avoid all unnecessary X-rays.
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A reaction is
(a) a reflex. (b) involuntary. (c) voluntary. (d) both a and b.
The Gulf Stream takes relatively cold water toward northwestern Europe
Indicate whether the statement is true or false.
Immune sera is produced in horses for all the following except
A. snake bites. B. diphtheria. C. botulism. D. chickenpox. E. spider bites.
What is golden rice?
A) Golden rice is rice that has had genes from other organisms added to it. These genes produce gold. B) Golden rice is rice that has genes taken from it for use in other organisms. These genes produce beta-carotene. C) Golden rice is rice that has had genes from other organisms added to it. These genes produce beta-carotene. D) Golden rice is rice that has had genes from other organisms added to it. These genes produce vitamin A. E) Golden rice is rice that has genes taken from it for use in other organisms. These genes produce vitamin A.