James Watson, Francis Crick, Rosalind Franklin, and Maurice Wilkins are recognized for their contributions to the

discovery of the ____.



a. presence of nuclein (DNA) in white blood cells
b. role of DNA in cells
c. chemical components of DNA
d. three-dimensional structure of DNA
e. location of DNA in cells


ANSWER: d

Biology & Microbiology

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If all of the variation in a trait in the population is due to differing genotypes, then the mean phenotype of the offspring would be identical to the parental mean

A. true B. false

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Farmers often spray spores of which bacterial species that make a protein toxic only to some insect larvae?

A. Aspergillus niger B. Proteobacteria C. Verticillium D. Agrobacterium tumefaciens E. Bacillus thuringiensis

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The major source of diversity for B and T cell receptors is____

a. mitosis b. meiosis c. transcript processing d. random recombination of gene segments e. mutation

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The pH of seawater is important to living organisms because:

a. it can affect the functioning of enzymes. b. it can interfere with metabolism. c. it can affect growth. d. All the above.

Biology & Microbiology