Mutations in human DNA rarely impair normal cell function because
A) repair of DNA prevents all mutations from ever causing damage to a cell.
B) damaged cells commit "suicide" to prevent damage to the body.
C) cells have one major repair enzyme that corrects the mutations quickly.
D) multiple DNA repair enzymes usually quickly correct the mutations before any damage can occur.
E) the cells attack dysfunctional gene products, averting damage to the cell.
D
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Sequence assembly is accomplished by:
A. aligning the fragments in the laboratory by running them through gel electrophoresis. B. aligning the fragments on paper. C. aligning the fragments by using a complex computer program. D. aligning the fragments by joining histones. E. None of the answer options is correct.
A plant will usually wilt when which component of water potential reaches 0 MPa?
A. solute potential B. turgor pressure C. total water potential D. gravity potential
In a search for new antibiotics, a previously unknown organism has been recovered from the soil. It is nonmotile and is composed of long threadlike structures formed from nucleated cells. It is not-photosynthetic and absorbs its nutrients. This organism will most likely be classified among the
A. Eukaryotes (Fungi) B. Archaea C. Eukaryotes (Algae) D. Eukaryotes (Protozoa) E. Bacteria
The endosymbiont hypothesis is supported by the work of ____ on bacteria-infected Amoeba proteus
a. Stanley Miller b. Kwang Jeon
c. Leslie Orgel d. Harold Urey e. Australian researchers