Members of which of the following groups exhibit radial symmetry?
a. Platyhelminthes
b. Cnidaria
c. Porifera
d. Nematoda
e. Mollusca
Ans: c. Porifera
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If a bacterium carrying a plasmid that confers resistance to ampicillin is placed into medium without ampicillin, it may
A) gain resistance to other antibiotics. B) transfer resistance to other cultures in the laboratory. C) undergo a reversion mutation. D) lose the plasmid because there is no selection for ampicillin resistance.
Heritability is measured as:
A. the slope of the line that relates the average phenotype of parents to the average phenotype of their offspring. B. the slope of the line that relates the average phenotype of parents to the average environment in which they live. C. the slope of the line that relates individual phenotype to environmental conditions. D. the degree of skewness of the distribution of offspring phenotypes. E. the difference between the norms of reaction of two phenotypes across the same range of environmental conditions.
Once the strands of DNA are separated, the enzyme DNA polymerase ____ and links nucleotides together
a. reads the nucleotide sequence of the template strand b. transforms the template strand to either 3' or 5' c. transforms adenine to thymine and guanine to cytosine d. folds the bases back on themselves e. unwraps the DNA from the nucleosomes
The ________ is the electron donor in a redox reaction.
A. reductant B. product C. enzyme D. oxidant