Anoxygenic phototrophs
A) may use a variety of electron donors for photosynthesis.
B) are an ancient monophyletic group of bacteria.
C) can be either autotrophic or heterotrophic.
D) can be either autotrophic or heterotrophic and may use a variety of electron donors for photosynthesis.
Answer: D
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Damage to the sinoatrial node in humans _____
A) is a major contributor to heart attacks B) would block conductance between the bundle branches and the Purkinje fibers C) would have a negative effect on peripheral resistance D) would disrupt the rate and timing of cardiac muscle contractions E) would have a direct effect on blood pressure monitors in the aorta
A signal sequence
A) directs RNA nucleotides to a particular gene. B) attracts tRNAs to an mRNA. C) is the first part of a protein's amino acid sequence that helps to direct it to a certain part of the cell. D) is a coding codon that mutates into a stop codon.
Which of the following characteristics would NOT have evolved with the others in the life history
strategy of a single species?
a. low fecundity b. active parental care c. multiple reproductive episodes d. low chance of survival in adulthood e. late reproduction
The following steps occur during multiplication of herpesviruses. Which is the third step?
A) attachment B) biosynthesis C) penetration D) release E) uncoating