For each of the following lac operon mutations, state whether transcription of ß-galactosidase will increase, decrease, or be unaffected. a. Plac- b. lacY+ c. lacI- d. lacO- e. lacA-
What will be an ideal response?
(a) decrease.
(b) initially unaffected.
(c) increase.
(d) increase.
(e) unaffected.
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Epithelial tissues covers ________.
A. the outer lining of blood vessels B. the outer lining of intestines C. the outer layer of skin D. All of the above are covered by epithelial tissues
In order for DNA molecules to undergo
recombination, a. they must be from the same species. b. their strands must separate as in replication. c. they must be cut and spliced at specific nucleotide sequences. d. one of the two DNA strands must be degraded. e. they must first be transcribed.
What are two of the characteristics of water that make it so important in living organisms?
What will be an ideal response?
Which key symptoms listed below can be used to distinguish between plants deficient in phosphorous vs. nitrogen (which symptom(s) is only associated with one of the deficiencies)?
A) the plants are stunted. B) the plants show symptoms on older leaves first. C) the plants are darker green and show evidence of wide spread purple anthocyanin pigmentation, especially in the veins. D) the plants show symptoms on younger leaves first.