The oxidizing agent in the enzyme superoxide dismutase is
A) superoxide anion (?O2-).
B) H2O2.
C) Copper.
D) O2.
E) All of the above.
C) Copper.
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At the beginning of this century there was a general announcement regarding the sequencing of the human genome and the genomes of many other multicellular eukaryotes. Many people were surprised that the number of protein-coding sequences was much smaller
than they had expected. Which of the following could account for much of the DNA that is not coding for proteins? A) most of the DNA serving as origins of DNA replication B) DNA that consists of histone coding sequences C) DNA that is translated directly without being transcribed D) non-protein-coding DNA that is transcribed into several kinds of small RNAs with biological function E) non-protein-coding DNA that serves as binding sites for reverse transcriptase
Based on the table of attributes given below, which of the following statements are FALSE about the two organisms?
Characteristic Bacterium A Bacterium B Endospore formation yes no Capsule no yes Type IV pili yes no Flagella no no Morphology bacillus bacillus A) Bacterium A is more resistant to heat and ultraviolet light. B) Bacterium B likely forms a slime layer better than Bacterium A. C) Bacterium B is likely to exhibit motility. D) Both bacteria may attach to surfaces.
The ____ gives structure to many unwalled, single-celled protists
a. contractile vacuole
b. pellicle c. Golgi body d. endoplasmic reticulum e. nucleus
Mycorrhizal fungi interact with plants at the
A. cuticle. B. edge of ponds. C. stomata. D. seed coat. E. roots.