Spallanzani's experiment was criticized because
A. he did not thoroughly sterilize his equipment.
B. he did not have a control group.
C. he sealed half of his containers, thereby excluding air.
D. his sample size was small.
C. he sealed half of his containers, thereby excluding air.
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Which of the following structural motifs are notcommonly found in the DNA-binding motifs of proteins that act as transcriptional regulators?
A. homeodomain B. leucine zipper C. ?-barrel D. helix-turn-helix
Which repair mechanism is responsible for repairing damage from UV radiation?
A. Recombinational repair B. Base excision repair C. Mismatch repair D. Nucleotide excision repair E. Nonhomologous end joining (NHEJ)
Cell walls are not typically possessed by ________.
A. protozoa B. bacteria C. algae D. fungi
Which of the following is thought to be the
descendant of engulfed ancient bacteria? a. nuclei b. Golgi bodies c. ER d. mitochondria e. lysosomes