BIOLOGY

1. What are the base-pairing rules for DNA?

FORMCHECKBOX a) A-G, T-C

FORMCHECKBOX b) A-C, T-G

FORMCHECKBOX c) A-U, C-G

FORMCHECKBOX d) A-T, G-C.

2. Anticodons pair with

FORMCHECKBOX a) mRNA codons.

FORMCHECKBOX b) DNA codons

FORMCHECKBOX c) RNA anticodons.

FORMCHECKBOX d) amino acids.

3. A duplicated chromosome has

FORMCHECKBOX a) two chromatids.

FORMCHECKBOX b) four chromatids

FORMCHECKBOX c) eight chromatids.

FORMCHECKBOX d) one chromatid.

4. Crossing over mixes up

FORMCHECKBOX a) chromosomes

FORMCHECKBOX b) alleles

FORMCHECKBOX c) zygotes.

FORMCHECKBOX d) gametes

5. The stage of meiosis that makes the descendent cells haploid is

FORMCHECKBOX a) prophase I.

FORMCHECKBOX b) prophase II.

FORMCHECKBOX c) anaphase I.

FORMCHECKBOX d) anaphase II.

FORMCHECKBOX e) methaphase I.

FORMCHECKBOX f) metaphase II.

6. Assuming complete dominance, crosses between two dihybrid F1 pea plants, which are offspring from a cross AABB aabb, result in F2 phenotypic ratios of

FORMCHECKBOX a)1:2:1.

FORMCHECKBOX b) 3:1.

FORMCHECKBOX c) 1.1.1.1.

FORMCHECKBOX d) 9:3:3:1.

7. A gene that affects three traits is

FORMCHECKBOX a) epistatic.

FORMCHECKBOX b) a multiple allele system.

FORMCHECKBOX c) pleiotropic.

FORMCHECKBOX d) dominant.

8. The probability of a crossover occurring between two genes on the same chromosome

FORMCHECKBOX a) is unrelated to the distance between them.

FORMCHECKBOX b) decreases with the distance between them.

FORMCHECKBOX c) increases with the distance between them.

9. Which of the following is one of the very important differences between mitosis and meiosis?

FORMCHECKBOX a) Chromosomes align midway between spindle poles only in meiosis.

FORMCHECKBOX b) Homologous chromosomes pair up only in meiosis.

FORMCHECKBOX c) DNA is replicated only in mitosis.

FORMCHECKBOX d) Sister chromatids separate only in meiosis.

FORMCHECKBOX e) Interphase occurs only in meiosis.

10. The main evolutionary advantage of sexual over asexual reproduction is that it produces

FORMCHECKBOX a) more offspring per individual.

FORMCHECKBOX b) more variation among offspring.

FORMCHECKBOX c) healthier offspring.

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