Selective expression of either the maternal or paternal copy of a gene is called ____________________. Fill in the blank(s) with the appropriate word(s)
genetic imprinting
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In what way does hemoglobin act as a buffer against changes in blood pH?
A) Subsequent binding of oxygen is drastically reduced after the first one is bound. B) Hemoglobin binds some of the excess protons released by carbonic acid. C) Hemoglobin produces protons or hydroxide ions as needed to alter the blood pH. D) Hemoglobin removes excess protons from the red blood cells so that they can be excreted through the kidneys.
The disease osteoporosis involves loss of both mineral and organic components from bones. Factors that may contribute to the development of osteoporosis include
A. lack of calcium and vitamin D in the diet. B. excess fat in the diet. C. prolonged disuse of muscles. D. a history of extreme sport participation. E. a decline in estrogen following menopause in women.
As the lungs expand, intra-alveolar pressure ________ and air moves ________ the lungs.
A) decreases : out of B) decreases : into C) increases : out of D) increases : into E) does not change : neither into nor out of
Which of the following environmental conditions may have an influence on enzyme activity?
a. substrate concentration b. temperature c. pH d. all of these are correct