In an experiment described in a chemistry lab book, the directions state that after mixing two chemicals (A and B) and waiting 5 minutes that A will be oxidized. This means that:
A. chemical A has lost electrons to chemical B.
B. chemical A has gained electrons from chemical B.
C. chemical A has gained energy in the form of heat from chemical B.
D. chemical A has lost energy in the form of heat to chemical B.
E. chemical A has reacted with oxygen.
A
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Thymine dimers are caused by
A) X-rays. B) active oxygen species. C) a mutagen such as ethylmethane sulfonate (EMS). D) depurination. E) UV light.
Which of these statements concerning the
centromere is NOT true? a. It appears to join duplicated DNAs. b. It anchors proteins to DNA. c. Its position along the chromosome varies. d. It is the location site for microtubule attachment. e. It is temporary.
Computer programs can scan DNA sequences and identify potential genes, which may or may not be functional genes. A functional gene must
a. share an exon with another functional gene. b. result in a mutant phenotype if its sequence is mutated. c. have an open reading frame. d. be expressed in all cell types of the organism. e. have a functional ortholog in another species.
Proteins that are loosely associated with the cytoplasmic membrane are called ________ proteins.
A. integral B. peripheral C. external D. internal