At which position does the phosphate group attach to the pentose sugar in a nucleotide?

Which of the following ratios is generally not constant for all given species?

Thymine is also known as . . . . . . .

Which of the following molecules is inherited by living organisms?

How many hydrogen bonds connect adenine to thymine?

Read the following statements and choose the set of correct statements:
$(a)$ Euchromatin stains light.
$(b)$ Heterochromatin is transcriptionally inactive.
$(c)$ Histone octamer contains eight molecules of histone proteins.
$(d)$ Packaging of chromatin at higher level requires additional set of proteins that are referred to as non-histone chromosomal $(NHC)$ proteins.
$(e)$ In a human diploid cell,$6.6 \times 10^9$ base pairs are present,not $6.6 \times 10$ nucleosomes.
Choose the correct answer from the options given below: