A primary difference between cyanobacteria and purple and green phototrophic bacteria is
A) energy source.
B) cell wall type.
C) electron donor for CO2 reduction.
D) cell type.
E) color.
C
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You are studying meiosis in an organism where 2n= 28. How many chromosomes will be present in each cell after meiosis I is complete but before meiosis II begins?
A. 7 B. 14 C. 28 D. 56 Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you know about meiosis? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Evolutionarily, the jaws of vertebrates developed from:
A. the circular mouth of lampreys B. the last pharyngeal arch of jawless fishes C. the third pharyngeal arch of jawless fishes D. the operculum E. the claspers
The mode of transmission of A. denitrificans can best be described as:
a. person-to-person contact. b. exposure to contaminated water. c. contaminated fluids or medical solutions. d. close contact with animals.
The wobble hypothesis is that
a. codon-anticodon pairing must only follow the standard base-pairing rules at the first two codon positions. b. some mutations introduce termination codons. c. most amino acids have more than one codon representing them. d. an mRNA may encode more than one polypeptide, and the ribosome may "wobble," or begin at alternate start codons. e. mutations are less likely to occur at the third base of the codon.