Sometimes a single-stranded molecule of RNA is able to fold back on itself because the nucleotide sequence on one part of the RNA is complementary to another part. This sequence motif results in a:
A. transcription factor binding site.
B. hairpin-shaped structure.
C. chromosome scaffold.
D. negative supercoil.
E. positive supercoil.
B
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Who proposed that the structure of DNA is a double helix with two polynucleotide chains running in opposite directions and held together by hydrogen bonding between pairs of nitrogenous bases?
A. Hershey and Chase B. Chargaff C. Franklin D. Watson and Crick E. Meselson and Stahl
Transposons that insert at a new location while a copy remains at the original location are said to mediate ________ transposition.
A. replicative B. composite C. simple D. incomplete
Acids have pH values below 7, whereas bases have pH values above 7
Indicate whether the statement is true or false
What level of taxonomy is Eukarya?
What will be an ideal response?