A nonsense mutation:
A: results in a protein that is truncated from the N-terminal end.
B: would likely not affect the activity of a protein.
C: would not affect the primary structure of a protein.
D: must result from a shorter mRNA transcript of the gene.
E: is a result of a change in a codon for an amino acid in a protein to a stop codon.
Answer: E: is a result of a change in a codon for an amino acid in a protein to a stop codon.
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You decide to repeat the Meselson-Stahl experiment, except this time you plan to grow the cells on light 14N medium for many generations and then transfer them to heavy 15N medium and allow them to grow for 2 additional generations (2 rounds of DNA replication). If the semiconservative model of DNA replication is correct, what is the expected distribution of DNA in the density gradient after two rounds of replication?
A. One band of intermediate density. B. One band of intermediate density and one band of light density. C. One band of intermediate density and one band of heavy density. D. One band of heavy density and one band of light density. E. One band of heavy density. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain? Gather Content · What do you already know about the Meselson-Stahl experiment? 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?
If genetically engineered bees could express a receptor for TNT in their olfactory neurons, how would the bees respond to the presence of TNT?
A. It would ignore the stimulus. B. It would be attracted. C. It would be repelled. D. It would depend on which olfactory neuron expresses the transgene. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about olfaction? What other information is related to the question? Choose Answer Given what you now know, what information 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?
A linear strand of DNA with two restriction enzyme cut sites will yield three fragments on digestion
Indicate whether the statement is true or false
In a grazing food chain,
A. secondary consumers eat detritus. B. secondary consumers eat photosynthetic organisms. C. primary consumers eat detritus. D. all the consumers are primary consumers. E. primary consumers eat photosynthetic organisms.