Which of the following is TRUE of fertilization?
A. It is critical to maintaining membrane polarity.
B. It restores the egg to a diploid state.
C. It both restores the egg to a diploid state and maintains membrane polarity.
D. It activates cell division.
E. It both restores the egg to a diploid state and activates cell division.
Answer: E
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Proto-cells are considered to have
a. been simple membrane-bound sacs. b. been able to capture energy. c. been able to engage in metabolism. d. been able to reproduce. e. all of these.
Gary and Stan are both about 6 ft tall and maintain a weight of 170 lb. Stan works at a desk and, for entertainment, watches a lot of movies. Gary also works at a desk and, for entertainment, plays on a soccer team
Who has a higher resting metabolism, and why? A) Because they are the same height and weight, their resting metabolisms are the same. B) Stan, because his fat cells burn more calories C) Gary, because his muscle cells burn more calories D) We need to know more about their dietary habits.
Tobacco smokers (and those exposed to tobacco smoke) are at greater risk of an ectopic (tubal) pregnancy. Based on your understanding of the structures of the cytoskeleton, what is the BEST explanation?
A) Tobacco interferes with the microtubule network of eggs thus weakening their structure. B) Tobacco interferes with the functioning of the flagella propelling sperm. C) Tobacco interferes with microfilament formation in sperm, thereby forcing the zygote to implant in a fallopian tube. D) Tobacco interferes with the sweeping motion of cilia that aids in the movement of the egg toward the uterus.
When an atom or molecule gains one or more electrons, it is said to be
A. energized. B. reduced. C. oxidized. D. polarized.