The structural level of a protein least affected by a disruption in hydrogen bonding is the _____
A) primary level
B) secondary level
C) tertiary level
D) quaternary level
E) All structural levels are equally affected by a disruption in hydrogen bonding.
Answer: A
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For a science fair project, two students decided to repeat the Hershey and Chase experiment, with modifications. They decided to label the nitrogen of the DNA, rather than the phosphate. They reasoned that each nucleotide has only one phosphate
and two to five nitrogens. Thus, labeling the nitrogens would provide a stronger signal than labeling the phosphates. Why won't this experiment work? A) There is no radioactive isotope of nitrogen. B) Radioactive nitrogen has a half-life of 100,000 years, and the material would be too dangerous for too long. C) Although there are more nitrogens in a nucleotide, labeled phosphates actually have sixteen extra neutrons; therefore, they are more radioactive. D) Amino acids (and thus proteins) also have nitrogen atoms; thus, the radioactivity would not distinguish between DNA and proteins.
_____ was probably not present in the Earth's early atmosphere.
A. H2O B. NH3 C. O2 D. CO2
During DNA replication, the continuous daughter strand is the leading strand
Indicate whether the statement is true or false
Species of Veillonella are always parasites of warm-blooded animals and are never found as part of the normal biota.
Answer the following statement true (T) or false (F)