DNA Replication MCQ Questions and Answers for Practice

1. A piece of double stranded DNA has 30% A, what will be the % of G?

1. 30%
2. 40%
3. 20%
4. 70%

2. ...........is the adaptor that is key to converting the triplet codons of mRNA into the protein polymers

1. rRNA
2. mRNA
3. siRNA
4. tRNA

3. DNA molecules are made up of subunits called nucleotides that are linked together. How many different types of nucleotides are used to make DNA molecules?

1. One type
2. Two types
3. Three types
4. Four types

4. During translation, the type of amino acid that is added to the growing polypeptide depends on the

1. codon on the mRNA and the anticodon on the rRNA.
2. anticodon on the mRNA and the anticodon on the tRNA.
3. anticodon on the rRNA and the codon on the mRNA.
4. codon on the mRNA and the anticodon on the tRN

5. Genes for medically important proteins can be cloned and inserted into bacteria, as shown in the diagram on the right. Why can bacteria recognize a human gene and then produce a human protein?

1. DNA replication in bacteria and humans is the same.
2. Bacterial cells contain the same organelles as human cells.
3. The basic components of DNA are the same in humans and bacteria.
4. Bacterial cells and human cells contain the same kind of chromosomes.

6. Genomic DNA is .............resulting in the production of ............

1. Transcribed, mRNA
2. Translated, tRNA
3. Transcribed, DNA
4. Translated, protein

7. How many amino acids are coded for the strand of mRNA show below? Assume the reading frame begins with the first nucleotide.

1. 1
2. 2
3. 3
4. 6

8. Humans, butterflies, and trees are all living things. In which of these organisms would you find DNA molecules?

1. Only in humans
2. Only in humans and butterflies
3. In humans, butterflies, and trees
4. In none of these organisms

9. In eukaryotes

1. Transcription takes place in the cytoplasm, and translation takes place in the nucleus.
2. Transcription takes place in the nucleus, and translation takes place in the cytoplasm.
3. Proteins are produced.
4. Transcription and translation both take place in the nucleus.

10. In humans, where does DNA replication take place?

1. Cytoplasm
2. Ribosomes
3. Nucleus
4. Cell membrane

11. The nitrogenous base is linked to the ribose or deoxyribose sugar via a

1. Glycosidic bond
2. Amide bond
3. Hydrogen bond
4. Phosphoanhydride bond

12. There are 64 codons and 20 amino acids. Which of the following is true?

1. Several different codons can specify the same amino acid.
2. Each codon specifies a different amino acid.
3. Some amino acids have no link to a codon.
4. Each amino acid is specified by only one codon.

13. What are the subunits that make up DNA molecules?

1. Amino acids
2. Nucleotides
3. Fatty acids
4. Proteins

14. What is the genetic code?

1. The sequence of subunits in a DNA molecule
2. The number of subunits in a DNA molecule
3. The sequence of subunits in a protein molecule
4. The number of subunits in a protein molecule

15. Which nucleotide in the figure below indicates the nucleic acid above is RNA?

1. Uracil
2. Cytosine
3. Guanine
4. Adenine