If 16% of the nucleotides in one strand of a DNA molecule contain the base G, what percent of the nucleotides on the complementary strand will also contain the base G?
A. 34%
B. 8%
C. 32%
D. 16%
E. Impossible to determine from the information given.
Answer: E
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Teratogens are substances that
A) cause birth defects. B) protect against infection. C) prevent accumulation of cholesterol. D) cause genetic disease.
Four of the five answers listed below are
characteristics of xylem. Select the EXCEPTION.
a. dead at maturity b. cell walls are impregnated with lignin c. conducts dissolved sugars d. includes tracheids and vessels e. has pits in the walls of the cells
You are interested in sequencing the gene for Tangier disease (OMIM 205404). The disorder is rare, so it is feasible to obtain only very few samples. The approximate chromosomal location of the gene is known
How would you set about deciding on a model organism to use to study this disease, and what would you do once you had decided? (An outline of your procedure after the organism is chosen will be sufficient).
A species that plays a major role in determining the structure of its ecological community is
A) a predator. B) a keystone species. C) a dominator species. D) the species with the largest size. E) the most abundant species in the community.