What is meant by the "directionality" of the strands of a DNA molecule? Explain how this directionality is ultimately responsible for Okazaki fragments. What will be an ideal response?
Concepts to Consider: The antiparallel nature of complementary strands; the directionality
of DNA polymerases; discontinuous versus continuous replication; the formation of Okazaki
fragments.
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Pesticide use has grown a great deal in the past century, and similar to the plant-herbivore evolutionary "arms race":
A. increased use of pesticides is leading to increased rates of resistance. B. widespread chemical treatments pose little concern because they wipe out all existing herbivores. C. pesticides are killing pests and their predators, reducing the overall level of herbivory in crop plants.
Epitopes or antigenic determinants
A. are parts of the antibody molecule. B. are T cell receptors. C. are a portion of antigen recognized by antibody. D. may be approximately 10-25 amino acids in length. E. are a portion of antigen recognized by antibody AND may be approximately 10-25 amino acids in length.
Epigenetic effects can sometimes even be passed from generation to generation. In what way would this kind of "inheritance" be an exception to Mendel's laws?
A. These effects must be caused by mutations. B. According to Mendel's laws, the effects of our environment are not passed on to the next generation. C. Mendel's laws apply only to pea plants, not all sexually reproducing organisms. D. Since they are scientific laws, Mendel's laws can't be violated even if there is new evidence to the contrary.
Which lobe of the cerebrum is a processing center for taste?
a. parietal b. occipital c. temporal d. frontal e. ganglional