The incorporation of the lacZ gene into the JCVI-syn1.0 genome was used as an indicator for successful transplantation because ________
A) the original genome of M. mycoides contained lacZ
B) the M. capricolum genome did not include lacZ
C) tetracycline resistance is conferred by lacZ
D) tetracycline resistance is a selective marker
Answer: B
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Which of the following is NOT a typical cellular change that occurs during lung cancer?
A. cellular hyperplasia B. loss of ciliated cells C. cellular displasia D. elevated gas transport E. increases in basal cell number and thickening of epithelium
Beta-N-Methylamino-L-Alanine, or BMAA, is a glutamate receptor agonist produced by cyanobacteria. Since Glu is an excitatory neurotransmitter, it is not surprising that BMAA is associated with neurological damage. Buildup of BMAA in fruit bats was hypothesized to cause neurodegenerative disease in islanders that fed on the bats. A recent study found high levels of BMAA in sharks, suggesting that consumption of shark fin soup is also dangerous. The researchers suggested that a secondary effect of BMAA may actually make these hazardous foods surprisingly desirable. What might this be?
A. Since BMAA is a Glu receptor agonist, it promotes incorporation of Glu into proteins, and has health-promoting effects. B. Since BMAA is derived from cyanobacteria, it provides unique nutrients not found in the animal or plant kingdom. C. Since BMAA is a Glu receptor agonist, it imparts a strong umami flavor that makes food more delicious. D. Since BMAA contains alanine, it improves protein synthesis by providing this rare nutrient. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about glutamate? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
By the end of spermatogenesis, how many mature sperm have been formed?
a. 1 b. 2 c. 4 d. 3
The occurrence of human identical twins is evidence that:a
all human cells are totipotent. b. no human totipotent cells have been identified. c. the only totitpotent human cell is the one-cell embryo. d. cells in a two-cell human embryo are totipotent. e. cells in a two-cell human embryo are pluripotent.