Which of the following conditions would most likely be due to high blood pressure in a mammal?
A) bursting of blood vessels in capillary beds
B) inability of the right ventricle to contract
C) reversal of normal blood flow direction in arteries
D) destruction of red blood cells
A
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Which of the following statements is not true concerning hormonal control over the male reproductive system?
A. Luteinizing hormone controls the production of sperm in the seminiferous tubules. B. These hormones are involved in a negative feedback relationship. C. The hypothalamus secretes a hormone called gonadotropin-releasing hormone. D. Follicle-stimulating hormone and luteinizing hormone are present in both males and females. E. The interstitial cells produce testosterone.
You are interested in mapping the relative positions of three genes in the E. coli genome and have access to several cell types to use for the mapping:
a) Describe F?, F+, Hfr, and F' bacterial cell types. b) How would you use one or more of these cell types to map genes A, B, and C in the E. coli genome? c) If you found that the results were A = 10, B = 5, and C = 3 (in the correct units), what could you conclude about the order and proximity of the three genes? What will be an ideal response?
When a mixture of live nonvirulent bacteria and dead virulent bacteria was injected into mice, Griffith unexpectedly found that the injected mice died. He explained this result by suggesting that the nonvirulent bacteria are being
A. transformed. B. translated. C. activated. D. expressed. E. transcribed.
Enzymes work by _____.
a) lowering the activation energy of a reaction and thus speeding up the reaction b) changing the free energy of a reaction and thus speeding up the reaction c) raising the activation energy of a reaction and thus speeding up the reaction d) lowering the delta G of a reaction and thus speeding up the reaction e) raising the delta g of a reaction and thus speeding up the reaction