Both deoxyribose and ribose belong to a class of sugars called
trioses
hexoses
pentoses
polysaccharides
The fact that a purine always paired base through hydrogen bonds with a pyrimidine base leads to, in the DNA double helix
the antiparallel nature
the semiconservative nature
uniform width throughout DNA
uniform length in all DNA
The net electric charge on DNA and histones is
both positive
both negative
Both (a) and (b)
zero
The promoter site and the terminator site for transcription are located at
$3^{\prime}$ (downstream) end and $5^{\prime}$ (upstream) end, respectively of the transcription unit
$5^{\prime}$ (upstream) end and $3^{\prime}$ (downstream) end, respectively of the transcription unit
the $3^{\prime}$ (downstream) end
Which of the following statements is the most appropriate for sickle-cell anaemia?
It cannot be treated with iron supplements
It is a molecular disease
It confers resistance to acquiring malaria
All of the above