A number of different genes have been identified as affecting skin color and there are probably more as yet unidentified. Each of these genes likely has several regulatory protein factors affecting their expression, and those proteins are coded for by
yet more genes. Thus there are many genes involved in determining skin color. A reasonable hypothesis about the geographic distribution of these genes is
A) different mutations affecting skin color are likely to be present in geographically different populations of humans.
B) humans living in areas with less UV radiation are likely to have many more mutations for skin color and therefore have a greater variation in skin color.
C) in any given geographic area, natural selection is likely to lead to a wide variation in skin color.
Answer: A
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A person who has lost a large amount of blood but is still alive is found in a wrecked automobile under a highway bridge. Several people are helping the paramedics load the victim into the ambulance. After the ambulance has departed for the hospital, you overhear the following conversation from the persons who helped the paramedics. "I am certain that when that guy gets to the hospital, they will transfuse him with any blood that they have in the blood bank since he has lost so much blood." The other person says, "Yeah, I bet you're right!" Having had a biology course, you know which blood could be safely given to anyone. Select it below.
A. A B. B C. AB D. O
Based on molecular evidence, fungi were present on land at least
a. 1 billion years ago. b. 500 million years ago. c. 250 million years ago. d. 125 million years ago. e. 10 million years ago.
Isotopes
a. are identical in mass number to the "standard" element. b. contain a different number of electrons than the "standard" element. c. contain a different number of protons than the "standard" element. d. contain the same number of protons but a different number of neutrons than the "standard" element. e. are actually a different element than the "standard" element.
In the cell, more than half of the energy produced by the metabolic breakdown of glucose is released as ________ and the remaining energy is stored in ________
Fill in the blank(s) with correct word