Test Questions 1

1. A diploid cell contains two pairs of homologous chromosomes. Each pair is heterozygous for a pair of alleles, Aa and Bb respect. After meiosis, how many different combinations of these alleles could be produced in the haploid daughter cells?
a. 2
b. 4
c. 8
d. 16
e. 64

2. Which of the following is a major difference between mitosis and meiosis?
a. Interphase is present only in mitosis.
b. Homologous chromosomes associate only in meiosis.
c. DNA replication occurs only in mitosis.
d. Daughter chromatids separate only in meiosis.
e. Chromosomes line up on the cell equator only in meiosis.

3. During which stage of meiosis do chromatids separate completely?
a. Anaphase I
b. Anaphase II
c. Metaphase I
d. Metaphase II
e. Telophase I

4. If X units of DNA are present in the nucleus of a cell, which has just divided, what is the relative amount present in this cell during prophase of the next mitosis?
a. X/4
b. X/2
c. X
d. 2X
e. 4X

5. Throughout which phase of the mitotic cycle would DNA be present in the lease amount in a nucleus?
a. Anaphase
b. Interphase
c. Metaphase
d. Prophase
e. Telophase

6. The genotype of a human zygote will differ from that of both parents. Which of the following does not contribute to this variation?"
a. Chiasmata occurring during meiosis
b. Mutation of genes
c. Presence of dominant genes
d. Random combination of gametes
e. Independent assortment

7. When a research horticulturalist needs to propagate from an experimental plant, why are cuttings used?
a. Seeds may show poor germination.
b. Seeds may show hybrid vigor.
c. Cuttings will be genetically identical.
d. Cuttings are more likely to survive and produce new plants.
e. Cuttings grow faster.

8. The mitotic index is defined by the following ratio: [Number of cells undergoing mitosis]/[total number of cells present]. When will the value of the mitotic index be high?
a. During cell enlargement
b. During pollen formation
c. During root tip growth
d. In mature tissues
e. In brain cells

9. The following events occur in mitosis and/or meiosis. Which event occurs only in meiosis?
a. Chromatid formation
b. Chromosome condensation
c. Chromosome movement to poles
d. Homologous chromosomes pairing
e. @Oe

10. During which stage of the mitotic cell cycle is DNA replicated?
a. Prophase
b. Metaphase
c. Telophase
d. Interphase
e. Cytokinasis

11. Which statement correctly describes homologous chromosomes?
a. They are formed during meiosis.
b. They are held together by centromeres.
c. They are identical.
d. They carry the same gene loci.
e. They are separated during mitosis.

12. Which statement describes the base pairing in nucleic acids?
a. Purine bases always pair with other purine bases.
b. Purine bases can only pair with pyrimidine bases.
c. Adenine cannot pair with either uracil or thymine.
d. Hydrogen bonding can only occur between the pyrimidine bases.
e. Guanine is always paired with adenine.

13. Which one of the following is NOT immediately essential for protein synthesis?
a. ATP
b. Enzyme
c. Glucose
d. mRNA
e. Ribosomal RNA

14. What is the maximum number of possible amino acids which could be coded for using the triplet code?
a. 3
b. 16
c. 48
d. 56
e. 64

15. What is the advantage of DNA having two complementary strands?
a. What is the advantage of DNA having two complementary strands?
b. Transcription and replication can occur simultaneously.
c. Semi-conservative replication is possible.
d. Diploid cells can inherit DNA from both parents.
e. Pyrimidines can form one strand and purines the other.

16. Which of the following basis is never found in RNA?
a. Which of the following basis is never found in RNA?
b. Cytosine
c. Guanine
d. Uracil
e. Thymine

17. Adenine comprised 36% of the nitrogenous bases in the DNA of cells from a bacterial clone. What was the percentage of guanine in the DNA?
a. 14%
b. 18%
c. 28%
d. 36%
e. 64%

18. Which of the following statements about the strands of a newly replicated DNA molecule is correct?
a. Both strands are made up of newly assembled nucleotides.
b. One strand is new and the other is part of the original molecule.
c. Both strands contain some nucleotides from the original molecule.
d. The sugar-phosphate chains are conserved and new bases are inserted between them.
e. The base pairs are conserved and new sugar-phosphate backbones are built up on them.

19. Which of the following is involved in the inter-chain linkage between complementary strands of DNA?
a. Covalent bonding between the sugar and nitrogenous bases
b. Covalent bonding between the sugar and the phosphate groups
c. Covalent bonding between adjacent sugar groups
d. Hydrogen bonding between the nitrogenous bases
e. Hydrogen bonding between adjacent sugar groups

20. How many nitrogenous bases code for 1 amino acid?
a. 1
b. 2
c. 3
d. 4
e. 5

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