' results = "Number correct: " + numCorrect + br + "Number incorrect: " + numInCorrect + br + br; output = bodyColor + results + evaluation + spacer; //Create new window and display output if (output != null) { createResultsWindow(output); } } // end hiding from old browsers -->
                   
 Tranlsate esta paginación

Test Questions 2

1. The mRNA codons of amino acids in a sequence of part of a polypeptide chain are shown below. UGU-GAU-CAC-UAG-GAU-AAG-CAC . Which DNA base sequence could provide the code for this section of polypeptide?
a. ACA-CTA-GTG-ATC-CTA-TTC-GTG
b. ACA-CTA-GTG-ATG-CTA-AAC-GTG
c. ACA-CTT-GTG-ATG-CTA-TTC-GTG
d. ACA-CUA-GUG-AUG-CUA-UUC-GUG
e. CAC-ATC-UTU-CTU-ATC-TTA-UTU

2. It has been established that, in many cells, ribosomes occur in chains along messenger RNA molecules. What is the advantage of this arrangement when compared with a situation in which ribosomes occur singly?
a. A greater variety of polypeptides can be produced.
b. Fewer transfer RNA molecules are used in protein synthesis.
c. Larger polypeptide chains can be produced.
d. Polypeptides can be produced more rapidly.
e. The probability of gene mutation occurring is lower.

3. Which statement correctly describes the transcription of DNA?
a. It produces amino acids.
b. It produces messenger RNA.
c. It results in increased DNA synthesis.
d. It is a semi-conservative process.
e. It occurs at the surface of the ribosome.

4. What is the function of the enzyme DNA polymerase?
a. To build a strand of DNA using DNA as a template.
b. To build a strand of DNA using a polypeptide as a template.
c. To build a strand of mRNA using DNA as a template.
d. To build a polypeptide using mRNA as a template.
e. To build a strand of DNA using mRNA as a template.

5. Which of the following is only present in DNA?
a. Phosphate
b. Ribose
c. Deoxyribose
d. Purine
e. Pyrimidine

6. If there were 34 amino acids and DNA only contained two types of nitrogenous bases, what would be the minimum number of bases p
a. 2
b. 3
c. 4
d. 5
e. 6

7. The insulin molecule is composed of two polypeptide chains, one consisting of 20 amino acids and the other consisting of 31. What is the minimum number of base pairs of DNA required to code for this molecule?
a. 20
b. 40
c. 60
d. 100
e. 153

8. Pyrimidine bases contain 4 carbon atoms and purine bases contain 5. How many carbon atoms are there in a nucleotide containing cytosine?
a. 8
b. 9
c. 10
d. 11
e. 12

9. What is the action of the enzyme DNA ligase?
a. DNA is broken up at specific sites.
b. DNA fragments are joined together.
c. DNA replication occurs.
d. DNA transcription occurs.
e. DNA is condensed to chromosomes.

10. One complete turn of the double helix contains 10 pairs of bases and is 3.4nm long. What is the approximate length of the DNA coding sequence of lysozyme, a protein of 129 amino acids?
a. 132nm
b. 113nm
c. 66nm
d. 44nm
e. 33nm

11. A synthetic mRNA molecule is made by using only two types of nucleotide, containing adenine and cytosine. How many different codons could it contain?
a. 2
b. 4
c. 6
d. 8
e. 12

12. What does a molecule of transfer RNA carry?
a. An amino acid molecule
b. Enzyme for protein synthesis
c. Information from the DNA
d. Sequence of codons
e. A ribosome

13. Which process does not occur during the formation of messenger RNA?
a. Condensation
b. Replication
c. Transcription
d. Polymerization
e. Complementary base pairing

14. The DNA code for glutamic acid is CTC or CTT. The code for valine is CAA or CAT. In sickle cell hemoglobin, valine is present instead of glutamic acid. Assuming a single base pair substitution has occurred, what is the mRNA code in the affected mutant?
a. CUU
b. GAA
c. GAG
d. GUA
e. GUU

15. Which of the following nitrogenous bases is present in DNA but is not present in RNA?
a. Adenine
b. Cytosine
c. Guanine
d. Thymine
e. Uracil

16. The four children of two parents each have a different blood group of the ABO series. What were the blood groups of the parents?
a. A and B
b. A and O
c. A and AB
d. B and O
e. B and AB

17. In the human ABO blood group system, there are six possible genotypes but only four phenotypes. An explanation of this is that the ABO blood groups are controlled by
a. One gene locus with three incompletely dominant (co-dominant) alleles.
b. One gene locus with two incompletely dominant (co-dominant) alleles and two recessive alleles.
c. One gene locus with two incompletely dominant (co-dominant) alleles and one recessive allele.
d. Two unlinked gene loci each with two alleles, one dominant and one recessive.
e. Two linked gene loci each with two alleles, one dominant and one recessive.

18. When a homozygous tall plant (TT) and a homozygous short plant is crossed, how many different type(s) of offspring will be produced?
a. 1
b. 2
c. 3
d. 4
e. 5

19. When a heterozygous tall plant (Tt) is crossed with another heterozygous tall plant (Tt), what is the probability of getting a tall plant (TT)?
a. 0%
b. 25%
c. 50%
d. 75%
e. 100%

20. Where in the cell is the cell's DNA located?
a. Cytoplasm
b. Mitochondria
c. Ribosome
d. Nucleus
e. Plastids
Next Page >>

Test Yourself

Table of Contents:
› Test Questions 1
› Test Questions 2
› Test Questions 3
› Test Questions 4

 
Best viewed in 800 x 600 pixels N4.0 & IE4.0 and above