A square meter of fertile soil contains trillions of bacteria
a. True
b. False
ANSWER: True
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Nearsightedness is also called
(a) myopia. (b) hyperopia. (c) presbyopia. (d) none of the above
Why are organisms with an odd number of chromosome sets usually sterile?
A) Almost all gametes will have an unbalanced set of chromosomes. B) Chromosomes will fail to segregate independently during meiosis I. C) Chromosomes will fail to segregate independently during meiosis II. D) Because an odd number of chromosomal sets is present, meiosis will not occur at all.
Amniocentesis and chorionic villus sampling are two methods of prenatal diagnosis. One important
difference between these techniques is that A. chorionic villus sampling is more routinely prescribed. B. amniocentesis can diagnose chromosome disorders, while chorionic villus sampling cannot. C. chorionic villus sampling can be performed earlier than amniocentesis. D. maternal risks are higher with chorionic villus sampling. E. the risk of miscarriage is higher with amniocentesis than with chorionic villus sampling.
Why has the diverse group of protists traditionally been grouped together?
a. They all have the same type of nutrition. b. They are not prokaryotes, fungi, plants, or animals. c. They all have very similar shapes. d. They all have very similar DNA sequences