Which of the following is NOT a feature of DNA?

Which of the following is NOT a feature of DNA?
a) Adenine (A) forms a base pair with thymine (T)b) Complimentary strands are anti-parallel, running in opposite directionsc) Complimentary strands are held together by hydrogen bonds between phosphate groupsd) Nucleotides within a single strand are connected by covalent bondse) All of the above are features of DNA
A man who carries a harmful sex-linked gene on his X chromosome, will pass the gene on to _______________________.
a) all of his daughtersb) half of his daughtersc) all of his sonsd) half of his sonse) all of his children
A double-stranded DNA molecule that has 22% guanine will have __________.
a) 28% thymineb) 22% cytosinec) 44% adenined) 26% uracile) both A and B are correct