Where is the trp repressor gene located?
a. just upstream of the trp operon
b. on a region of the chromosome quite distant from the trp operon
c. adjacent to the lac repressor gene
d. just downstream of the trp operon
e. directly adjacent to the promoter region
B
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Why is nonhomologous end joining (NHEJ) more frequent in eukaryotes?
A. Bacteria replicate frequently and so can use recombination repair to repair most double-strand breaks. B. The period of time between DNA synthesis events is longer so double-strand breaks occurring outside of the period require NHEJ. C. NHEJ is a mutagenic process that is tolerated better in larger genomes. D. Some eukaryotic cell types use NHEJ as a source of gene variation. E. All of the choices given are correct.
Groups of sites within an area that are at different stages of succession are known as
A) autosequences. B) ecotypes. C) clines. D) chronosequences.
The most advanced stone tools were made by:
a. Homo habilis. b. Homo erectus. c. Neandertals. d. Cro-Magnons. e. Homo africanus.
Which of these is a type of chemical bond that involves the sharing of electrons
a. hydrogen b. buffer c. surface tension d. ionic e. covalent