When molecules are referred to as D- or L- (for example D-forms of sugars and L-forms of amino acids), the D- and Ldesignations
refer to the specific ____.
a. functional group
b. structural isomer
c. covalent bond
d. secondary structure
e. stereoisomer
ANSWER: e
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Translocations and inversions may result in
A. TNRE B. Anticipation C. Position effect D. Genome mutations
An r-strategist is characterized by
A) slow population growth. B) a slow rate of development. C) a long life expectancy. D) density-independent mortality.
The stage of mitosis characterized by the physical separation of sister chromatids is called
A. telophase. B. anaphase. C. prometaphase. D. metaphase.
Which of the following occurs in the placenta?
A) Eroding blood vessels in the endometrium bathe chorionic villi in pools of maternal blood. B) Hormones are absorbed to prevent them from influencing the developing fetus. C) Fetal blood and maternal blood mix. D) All substances in maternal blood that may be harmful to the fetus are prevented from moving across the walls of the villi. E) The amnion and the chorion grow into the endometrium.