One nucleotide contains one
A. pentose sugar.
B. phosphate.
C. nitrogen base.
D. All of the choices are correct.
Answer: D
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The disinfectant of choice for municipal water supplies is ________.
A. ultraviolet light B. either fluorine or chlorine C. fluorine D. chlorine
Acute viral gastroenteritis is the leading cause of death in
A. children in the United.States. B. children in developing countries. C. children in day care centers. D. children worldwide.
Which of these may show enzymatic activity?
a. lipids b. proteins c. DNA d. lipids and proteins e. proteins and carbohydrates
Consider a chromosome with ordered loci A (A/a), B (B/b), C (C/c), D (D/d), and E (E/e) where the letters in the parentheses indicate the alleles at loci
On a chromosome in which A, C, D, and E are coupling, a new allele arises at the locus B. This new allele B, has a negative effect on fitness. As a result, we would expect: a. the genetic variation at neighboring loci to decrease. b. the alleles A, C, D, and E may be lost due to background selection. c. the alleles A, C, D, and E may be lost due to genetic hitchhiking. d. A and B. e. All of the above.