The functional group that forms covalent bonds between R groups within a polypeptide and that stabilizes tertiary structure is
A. -NH2
B. -COOH
C. -PO4
D. -SH
E. -OH
D. -SH
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In the Hershey-Chase experiment, bacterial viruses, called phage, were used to demonstrate that DNA is the genetic material. The phage that were used for this experiment consisted of DNA surrounded by a protein coat. Phage will attach to specific types of bacteria and inject their DNA into the bacterial cell. To scientifically determine whether DNA is the genetic material, Hershey and Chase made
phage in a medium containing radioactive sulfur-35 (S35). Why was S35 used in this experiment? A. Only amino acids contain sulfur. B. Only nucleic acids contain sulfur. C. Both nucleic acids and amino acids contain sulfur. D. The radioactive sulfur labels peptide bonds.
The Calvin cycle includes 15 enzymes, most of which are involved in __________
A. RuBP carboxylation B. RuBP regeneration C. reduction D. starch synthesis E. ATP synthesis
DNA polymerase III has an error in replication once every 100 million nucleotides
Indicate whether the statement is true or false
RNA contains the nitrogenous base ________ instead of ________, which is found only in DNA
A) a deoxyribose sugar... a ribose sugar B) uracil... thymine C) uracil... guanine D) thymine... uracil