The two strands of a DNA double helix are said to be antiparallel. This means that
a. the 5' end of one strand is directly paired with the 5' end of the other strand.
b. since the double helix twists, it is not perfectly parallel.
c. one strand has a negative charge and the other strand has a positive charge.
d. the 5' end of one strand is directly paired with the 3' end of the other strand.
e. both strands have a negative charge.
D
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Which of the following is not true of mitotic recombination?
A. Recombination occurs during mitosis when replication forks encounter lesions in the process of repair or single-strand breaks. B. The recombinase Dmc1 is active in mitotic and meiotic recombination mechanisms. C. The BRCA2 protein is a recombination mediator active in mitotic recombination repair. D. It employs synthesis-dependent strand annealing (SDSA) most commonly. E. It can employ double-strand break repair (DSBR), which can lead to crossing over.
How do archaea differ from bacteria? What will be an ideal response?
A steady, low-level contraction of a muscle is referred to as
a. tetanus. b. treppe. c. spasm. d. tone. e. fatigue.
A restriction in genetic variability caused by a drastic reduction in population size is called a
A. adaptive effect. B. bottleneck effect. C. Hardy-Weinberg effect. D. founder effect. E. polymorphic effect.