What is the first step in genetic recombination?
a) the introduction of single- stranded breaks in aligned DNA molecules
b) the exchange of pieces of DNA between homologous chromosomes
c) the accurate alignment of DNA molecules
d) the introduction of double -stranded breaks in aligned DNA molecules
e) lengthening of the chromosomes
Ans: d) the introduction of double -stranded breaks in aligned DNA molecules
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Which of the following distinguish the field of microbiology from other fields of biology?
A. The techniques used to study organisms regardless of their size. B. Neither the size of the organism studied nor the techniques employed in the study of organisms regardless of their size. C. The size of the organism studied. D. Both the size of the organism studied and the techniques employed in the study of organisms.
In vertebrates, the main function of the urinary
system is to
a. rid the body of excess water. b. rid the body of unwanted solutes. c. conserve excess water. d. rid the body of excess water and unwanted solutes. e. do none of these
A composite organism consisting of a fungus
with either a cyanobacterium or green alga as a partner is called a
a. mycorrhiza. b. rust. c. lichen. d. mycelium. e. chytrid.
The most significant conclusion of the experiments on Heliconius butterfly mimics is that ________
A) evolution can sometimes happen by sudden jumps B) genes can occasionally be transferred between completely unrelated organisms C) natural selection is the only mechanism for evolutionary diversification D) the same developmental genetic mechanisms underlie a great range of variants E) development must be studied separately from evolutionary genetics