Plants lacking a well-developed vascular system, true roots and leaves are informally known as
a. gametophytes
b. sporophytes
c. angiosperms
d. gymnosperms
e. bryophytes
Ans: e. bryophytes
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Which of the following is false?
a. All mammals have either an estrous or a menstrual cycle. b. Some primates have a menstrual cycle. c. Some female primates may be physically and behaviorally receptive to sexual activity at any time. d. About 10% of detected pregnancies end in miscarriage. e. Mifepristone (RU-486) is approved to indiuce abortion any time during the first six months.
The formation of tissues and organs in ordered
spatial patterns begins with a. fertilization. b. gamete formation. c. embryonic induction. d. cytoplasmic localization. e. morphogenesis.
Disease spread in poorer countries of the world is increased by
A) inadequate medical care. B) lack of immunizations and antibiotics. C) malnourishment. D) all of the above.
Foodborne diseases caused by pathogenic Escherichia coli strains are relatively ________ and ________ require hospitalization
a. common / often b. common / rarely c. rare / often d. rare / rarely