Discussion: Complementary Strands

Discussion: Complementary Strands

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14. Which of the following is NOT a feature of DNA?

A) Adenine (A) forms a base pair with thymine (T)

B) Complementary strands are anti-parallel, running in opposite directions

C) Complementary 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

15. 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

16. 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

17. Which of the following variations could be subject to natural selection?

A) A dog with short legs due to malnutrition is able to crawl into holes better than his litter mates

B) A tree is not infested by a ground-dwelling beetle when the homeowner cuts the lower branches

C) A hyena is born with a spotted fur pattern that allows it to hide in the grass better than his litter mates

D) A pigeon learns than when its keeper comes near it will be fed

E) All of these variations may be acted on by natural selection

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18. 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

19. You observe the following outside your window: A grasshopper is munching away on a leaf when a hawk swoops down and eats the grasshopper. What is the grasshopper in this situation?

a) secondary consumer

b) prey

c) herbivore

d) predator

e) b, c and d

20. Which of the following statements is *NOT* true?

a) The cells resulting from meiosis are diploid and the cells resulting from mitosis are haploid.

b) Meiosis and meiosis both starts with one cell, but meiosis ends with four and mitosis with two.

c) Mitosis produces new cells for growth and repair, meiosis produces gametes.

d) Mitosis goes through cytokinesis once, meiosis goes through cytokinesis twice.

e) Cross over happens in meiosis, but not in mitosis.

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