The final proof for DNA as the genetic material came from the experiments of
Griffith
Hershey and Chase
Avery, Mcleod and McCarty
Avery, Mcleod and McCarty
B.
Hershey and Chase
Hershey and Chase gave unequivocal proof which ended the debate between protein and DNA as genetic material.
Antiparallel strands of a DNA molecule means that
one strand turns anti-clockwise
the phosphate groups of two DNA strands, at their ends, share the same position
the phosphate groups at thestart of two DNA strands are in opposite position (pole)
the phosphate groups at thestart of two DNA strands are in opposite position (pole)
C.
the phosphate groups at thestart of two DNA strands are in opposite position (pole)
J.D. Watson and F.H.C. Crick (1953) showed that DNA has a double helical structure with two polynucleotide chains structure with two polynucleotide chains connected by hydrogen bonds and running in opposite directions (antiparallel). The antiparallel strands of a DNA molecule means that the phosphate groups at the start of two DNA strands are in opposite position (pole).
Amino acid sequence, in protein synthesis is decided by the sequence of
t-RNA
m-RNA
c-DNA
c-DNA
B.
m-RNA
In the process of protein synthesis, the messenger RNA (m-RNA) is responsible for carrying the genetic code transcribed from DNA to specialized sites within the cell (called ribosomes) where the information is translated into protein composition. The sequence of amino acids in a particular protein is determined by the sequence of t-RNA, c-DNA or r-RNA do not decide the amino acid sequence in protein synthesis.
Which of the following are not polymeric?
Nucleic acids
Proteins
Polysaccharides
Polysaccharides
D.
Polysaccharides
One turn of the helix in a B-form DNA is approximately
20 nm
0.34 nm
3.4 nm
3.4 nm
C.
3.4 nm
B-DNA is helical structure with 20 diameter and the distance between the two base pairs is 3.4 and there are 10 base pairs in each turn or pitch (one round). Hence, one turn of the helix is approximately 34 or 3.4 nm