Which group has high resistance to HIV, because it helped them combat smallpox and the plague?
A. europeans
B. caucasians
C. asians
D. africans
Answer: A. europeans
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If a pea plant strain is true-breeding for a particular trait, then:
A. crosses between two true-breeding plants with the same trait will have offspring identical to the parents. B. it will be homozygous for all genes. C. it must be a recessive trait. D. it is not useful for studying inheritance. E. it only self-fertilizes.
The number of linkage groups in an organism with sex chromosomes equals:
A. 1n B. 2n +1 C. 1n + 1 D. 2n + 2
The iron meteorites
a. never fall on the Earth. b. are only found in the Antarctic. c. are composed of carbonaceous chondrites. d. are responsible for most of the meteor craters on the surface of the moon. e. appear to have formed in the interiors of molten planetesimals.
Which of the following lack a nucleus and are structurally simple?
a. eukaryotes b. prokaryotes c. fungi d. algae e. protists