V
A) A
B) B
C) C
D) D
E) E
Answer: A
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You cut a plasmid with a restriction enzyme that cuts it into three pieces — one fragment is 240 base pairs, one fragment is 600 base pairs, and one fragment is 1200 base pairs. You carry out electrophoresis of the digested sample. Which of the fragments will be closer to the top of the gel where the sample was inserted?
A. The 240 base pair fragment. B. The 600 base pair fragment. C. The 1200 base pair fragment. D. They will all be near the top because they all have sticky ends. E. It depends on the charge of the DNA fragment.
The main problem for sufferers of cystic fibrosis is
A. abnormal hemoglobin. D. missing DNA repair enzymes. B. elevated levels of cholesterol. E. formation of cysts in kidneys. C. mucus blocking ducts of glands.
What is the body's response to a rise in temperature above 37.0 degrees C?
A. Blood vessels in the skin begin to constrict which increases blood flow to the surface of the skin. Environmental variables will help decrease the temperature of the blood. The nervous system also activates the sweat glands which help decrease temperature. B. Blood vessels in the skin begin to dilate which increases blood flow to the surface of the skin. Environmental variables will help decrease the temperature of the blood. The heart rate decreases in an attempt to slow down blood flow. C. Blood vessels in the skin begin to dilate which increases blood flow to the surface of the skin. Environmental variables will help decrease the temperature of the blood. The nervous system will deactivate the sweat glands to help decrease body temperature. D. Blood vessels in the skin begin to dilate which decreases blood flow to the surface of the skin. Environmental variables will help decrease the temperature of the blood. The heart rate increases in an attempt to slow down blood flow. E. Blood vessels in the skin begin to dilate which increases blood flow to the surface of the skin. Environmental variables will help decrease the temperature of the blood. The nervous system also activates the sweat glands which help decrease temperature.
What is the key difference between photoheterotrophs and photoautotrophs?
a. Photoautotrophs only use bacteriochlorophyll; photoheterotrophs only use chlorophyll a. b. Photoheterotrophs produce oxygen as a by-product; photoautotrophs do not. c. Photoheterotrophs use hydrogen sulfide for reducing power; photoautotrophs do not. d. Photoheterotrophs use organic compounds as their carbon source; photoautotrophs use carbon dioxide as their carbon source.