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 directions
c) Complimentary strands are held together by hydrogen bonds between phosphate groups
d) Nucleotides within a single strand are connected by covalent bonds
e) 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 daughters
b) half of his daughters
c) all of his sons
d) half of his sons
e) all of his children
A double-stranded DNA molecule that has 22% guanine will have __________.
a) 28% thymine
b) 22% cytosine
c) 44% adenine
d) 26% uracil
e) both A and B are correct

The ability of fireflies and angler fish to produce light is an example of convergent evolution. What can you conclude about these two animals based on this information?
a) They share a recent common ancestor
b) They are both adapted to environments low in light
c) The ability to produce light is an ancient trait
d) They are found in the same location
e) All of the above