A portion of DNA that encodes a specific protein is
a) a gene.
b) a chromosome.
c) a chromatid.
d) a centromere.
e) a kinetochore.
Ans: a) a gene.
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When bacilli in a chain fold back upon each other like a hinge, this cellular arrangement is termed a ________.
A. sarcina B. tetrad C. palisade D. strep E. staph
As a result of experimentation,
a. more hypotheses may be developed. b. more questions may be asked. c. a new biological principle could emerge. d. entire theories may be modified. e. all of these.
If a trait is inherited in an autosomal recessive fashion, which of the following is not true?
A. Both sexes are equally affected. B. The trait will not occur in offspring if one of the parents is homozygous dominant. C. About one-fourth of the offspring of two heterozygotes will be affected. D. The trait often appears in the progeny of unaffected parents. E. Two affected individuals can have an unaffected child.
The individual with genotype AaBbCCDdEE can make many kinds of gametes. Which of the following is the major reason?
A) recurrent mutations forming new alleles B) crossing over during prophase I C) different possible assortment of chromosomes into gametes D) the tendency for dominant alleles to segregate together