Genetics MCQs Quiz Multiple Choice Questions & Answers

1. Proteins are made of amino acids linked together by specific bonds called

1. Peptide bonds
2. Nitrogen bonds
3. Hydrogen bonds
4. Hydrogen & Nitrogen bonds

2. What are the repeating units of nucleic acids?

1. phosphate molecules
2. nucleotides
3. bases
4. sugar molecules

3. ______ is a genetic changes that occur in more than 1 percent of the population

1. Polymorphisms
2. Monotheism
3. Frameshift mutation

4. Which of the following is not needed for DNA transcription?

1. Ribosomes
2. Nucleotides
3. DNA
4. Enzymes

5. A pedigree chart shows:

1. The genotypic ratios of the offspring.
2. The types of gametes produced by the parents.
3. The pattern of inheritance of a specific gene.
4. Which genes are co-dominant.

6. BRCA-1 is associated with which cancer?

1. Thyroid
2. Leukemia
3. Lung
4. None of the above

7. A heritable feature is a ______ and may have two or more variants called

1. trait/characteristics
2. character/traits
3. character/factors
4. trait/factors

8. Proteins that assist the binding of RNA polymerase to the promoter region on DNA strand are called

1. Transcription factor
2. SSB protein
3. Sigma factor
4. All of the above

9. Cancer cells are

1. Unlimited number of cell divisions
2. Growth without external signals
3. Avoidance of cell death
4. All of the above

10. Normal human eggs have

1. 22 autosomes and an X chromosome.
2. 22 autosomes and a Y chromosome.
3. 23 autosomes.
4. 46 chromosomes.

11. The cytoplasm of an animal cell is divided by means of:

1. A cleavage furrow.
2. A cell plate.
3. A cell membrane formed within the cytoplasm.
4. Mitosis.

12. Which of the following is correct?

1. A forms 2 hydrogen bonds with G; T forms 3 hydrogen bonds with C
2. A forms 3 hydrogen bonds with T; G forms 2 hydrogen bonds with C
3. A forms 2 covalent bonds with T; G forms 3 covalent bonds with C
4. A forms 2 hydrogen bonds with T; G forms 3 hydrogen bonds with C

13. Which of the following may contribute to causing cancer?

1. a mutation in a gene that slows the cell cycle
2. faulty DNA repair
3. loss of control over telomere length
4. all of the above

14. Which of the following is not true of DNA?

1. A pairs with T and G pairs with C
2. Nitrogen bases are 0.34 nm apart on a DNA strand
3. The double helix is 2.0 nm wide
4. The double helix is 3.4 nm wide

15. Those mutations that occur by environmental damage or mistakes during DNA replications are

1. Acquired mutations
2. Inherited mutations
3. A and B
4. None of these

16. Why is sickle cell disease so called?

1. because it makes people sick
2. its named after a special type of white blood cell
3. pH changes in the blood cells make them collapse into a sickle shape
4. because its caused by an infectious microorganism that has sickle shaped cells

17. Those cancers that derived from ectoderm or endoderm of epithelial cell are called

1. Carcinoma
2. Sarcoma
3. Leukaemia
4. Myeloid

18. During cell division there are three types of check points one of them (M checkpoint) to ensure

1. Chromosomes are attachedto the spindle
2. Complete DNA replication
3. DNA not damage or broken
4. All of the above

19. Proto-oncogene in normal cells

1. Code for proteins involved in the stimulus of cell division
2. Suppresses progression through the cell cycle in response to DNA damage
3. Initiates apoptosis
4. None of the above

20. Which of the following factors could lead to variations in the offspring of asexually reproducing organisms?

1. Crossing over.
2. Fertilization.
3. Mutations.
4. Independent assortment.

21. The enzyme which builds a mRNA strand complimentary to the DNA transcription unit is called:

1. DNA polymerase
2. RNA polymerase
3. Helicase
4. DNA ligase

22. Changes in the nucleotide sequence of DNA which arent passed to offspring occur in

1. Eggs & sperm cells
2. Non-sexual cells
3. Diploid and haploid cells
4. All of the above

23. A gene is a section of DNA that codes for a protein, this unique sequence of bases will code for the production of a unique protein is:

1. Exon
2. Intron
3. Regulatory sequence
4. None of these

24. The triplet code of CAT in DNA is represented as ______ in mRNA and ______ in tRNA.

1. GAA, CAT
2. CAT, CAT
3. GUA, CAU
4. GTA, CAU

25. ______ portions of chromosomes that stain lightly andonly partially condensed

1. Heterochromatin
2. Euchromatin
3. Facultative chromatin
4. Constitutive

26. Those mutations that arise in the absence of known mutagen are known

1. Induced mutations
2. Fused mutations
3. Spontaneous mutations
4. None of the above

27. Chromosomes measurements are generally taken during

1. Interphase
2. Prophase
3. Anaphase
4. None of these

28. Which of the following is correct with regard to aneuploidy?

1. Inversion
2. 2n + 1
3. All aneuploid individuals die before birth
4. 4n

29. The X - ray diffraction studies conducted by ______ were key to the discovery of the structure of DNA

1. McClintock
2. Franklin
3. Meselson and Stahl
4. Chargaff

30. Carriers of the colour-blindness trait include:

1. Men who are heterozygous for the trait.
2. Men who are homozygous for the trait.
3. Women who are heterozygous for the trait.
4. Women who are homozygous for the trait.

31. Which of the following descriptions of chromosomes is not correctly matched?

1. Metacentric chromosome arms are almost equal in size.
2. Submetacentric chromosome arms are slightly different in size.
3. Acrocentric chromosome arms are identical in size.
4. Telocentric there is only one chromosome arm.

32. When cancer cells gain the ability to move independently and invade other tissues, they are said to have:

1. Mobilized.
2. Evolved.
3. Metastasized.
4. Metamorphed.

33. A ______ made inside the nucleus of a cell, associates with proteins to form ribosomes.

1. mRNA
2. rRNA
3. tRNA
4. All of the above

34. If you performed a laboratory analysis of DNA, you would find that the amount of adenine is ____________ the amount of thymine.

1. much greater than
2. much less than
3. about the same as
4. shows no relationship

35. The most common form of severely affected people who are havingmore than 1000 repeats of the CTG triplet are called

1. Myotonic dystrophy
2. Fragile X syndrome
3. Retinoblastoma

36. Histone four (H4) consists of 102 aminoacids and it has

1. Negative charge
2. Positive charge
3. Neutral
4. None of these

37. In addition of histone protein chromatin contains an approximately equal mass of a wide variety of

1. Non-histone protein
2. RNA
3. Positive charge protein
4. Unknown protein

38. Which blood type would not be possible for children of a type AB mother and a type A father?

1. O
2. A
3. B
4. AB