What primary structures package cellular secretions for export from the cell?
a. Golgi bodies
b. ribosomes
c. mitochondria
d. lysosomes
e. endoplasmic reticula
ANSWER: a
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A healthy person can normally exhale what percentage of his or her vital capacity in one second?
A) 80 B) 50 C) 10 D) 100 E) 20
Which is the underlying cause of carcinogenesis?
A) irreversible DNA changes B) aging C) immunodeficiency D) chronic inflammation and irritation
Once the root-fungus-resistant gene was inserted into the papaya plants, the genetically modified papaya plants were __________.
a. heated up to over 100 degrees Celsius to sterilize the plant surfaces b. hybridized with genetically modified Hawaiian pineapple plants to produce hybrids resistant to all known papaya diseases c. tested to be sure that they were substantially equivalent to non-engineered fruit d. ready to be grown to produce fruit for human consumption
A mutation results in the loss of the finger-like cell wall ingrowths found in normal placental transfer tissues. What effect is this mutation most likely to have on the development of the embryo?
A. The embryo will be unable to develop because necessary sugars can no longer be transported across the plasma membrane. B. The embryo will be unaffected because plant embryos are not dependent on transfer of nutrients from maternal tissues. C. The embryo will develop at a slower rate because the rate of nutrient transfer from mother to embryo will be decreased. D. The embryo will be unaffected because the cell wall ingrowths of placental transfer tissues have no effect on nutrient transfer from maternal tissues. E. The embryo will develop too quickly because the rate of nutrient transfer from mother to embryo will be increased.