One of the major causes of panda bears becoming
endangered is
a. habitat loss and fragmentation.
b. increasing the effects of chemical pollution.
c. a sexually transmitted disease that plagues the
bears.
d. introduced exotic species into a habitat.
e. all of these.
Answer: a
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During winter in the Northern Hemisphere, the Intertropical Convergence Zone
A) sits directly over the equator. B) is shifted into the northern latitudes. C) is shifted into the southern latitudes. D) does not exist.
The two groups of angiosperms are
A. mosses and club mosses. B. ginkgos and cycads. C. monocots and eudicots. D. horsetails and ferns. E. conifers and gnetophytes.
Lard is a solid fat at room temperature. What does this tell you about the triglycerides in lard?
A) Lard is composed of saturated fats. B) The fats in lard are mostly phospholipids. C) The fats in lard are not organic molecules. D) Lard is composed of unsaturated fats.
Trisomy 21, or Down syndrome, occurs when there is a normal diploid chromosomal complement but one (extra) chromosome 21. While there is reduced fertility in both sexes, females have higher fertility than males. Van Dyke et al. (1995; Down Syndrome
Research and Practice 3(2 ): 65-69 ) summarize data involving children born of Down syndrome individuals. Given the fact that conceptuses with 48 chromosomes (four #21 chromosomes) are not likely to survive early development, what percentage of surviving offspring would be expected to have Down syndrome if both parents have Down syndrome? A) One-third of the surviving offspring would be expected to have Down syndrome. B) All the children would be expected to have Down syndrome. C) One-half of the surviving offspring would be expected to have Down syndrome. D) Two-thirds of the surviving offspring would be expected to have Down syndrome. E) None of the surviving offspring would be expected to have Down syndrome.