MCQ on Bacterial genetics



1)Select all of the correct statements about DNA molecule
a. It carries genetic information
b. It consists of double-helical nucleotides
c. Exists as double stranded DNA in all bacteria and viruses
d. Composed of four nitrogen containing bases

2) All of the following are the major types of RNA that are classified according to their structure and functions, Except
a.messenger RNA
b.transfer RNA
c.ribosomal RNA
d.complementary RNA

3)Identify the correct statements about the nitrogen bases present in DNA and RNA
a. Adenine is complementary to thymine only in DNA
b. Adenine is complementary to Uracil both in  DNA and RNA
c. Cytosine is complementary to guanine only in DNA
d. Cytosine is complementary to guanine both in DNA and RNA

4)Which of the following organism consists of single-stranded DNA?
a. Fungi
b. Viruses
c. Protozoa
d. Eukaryotes

5) Which of the following statement about chromosomes is correct?
a. It consists of genetic information and is found in eukaryotes but not in bacteria
b. Present in DNA and RNA that carries the genetic information
c. The bacterial chromosome has DNA that exists in a linear form
d. It is a strand of nucleic acid and proteins of DNA that carry the genetic information

6) The bacteria consists of circular DNA molecules that are present in the cytoplasm of the bacteria.          What is the term given for the genetic material?
a. Chromosomal DNA
b. Chloroplast DNA
c. Extra-Chromosomal DNA 
d. Mitochondrial DNA

7)  Changes in the nucleotide sequence of DNA can lead to mutation which may result in hereditary variation. Delta variant is the mutant of which of the following pathogen?
a) Coronavirus
b) Poxvirus
c) Hepatitis B virus
d) Ebola virus

8)What are the different terms given for the methods of transmission of genetic information that occur in bacteria?
a) Transformation
b) Conjugation
c) Transduction
d) Transcription

9) R plasmids are the plasmids that
a) have an effect on the production of bacterial toxins     
b) have the effect in resistance to antibiotics 
c) have control on structural components of pathogenic bacteria
d) None of the above

10) The gene transfers in microorganisms occurs via the transposons or 'jumping genes', these are also a...........................
a) RNA molecule
b) Genome   
c) Plasmids
d) DNA molecule 

11)What is the transduction process?
a) The genome is transferred from one bacterium to another bacterium
b) The part of the DNA is transferred by bacteriophage from one bacterium to another
c) The plasmid is transferred from one bacterium to another
d) The part of the DNA molecule is transferred into the RNA molecule 

12) The antibiotic resistivity of bacteria occurs mainly by mutation or genetic transfer, which of the following is the mechanism of action through which bacteria acquires resistance to the penicillins
a) Inhibition of Nucleic acid synthesis
b) Inhibition of metabolic pathways
c) Inhibition of cell wall synthesis
d) Inhibition of protein synthesis 




Answers:
1- a), b), and d)
2- d) complementary RNA
3- a)Adenine is complementary to thymine only in DNA, (d) Cytosine is complementary to guanine both in DNA and RNA
4- b) Viruses
5- d)It is a strand of nucleic acid and proteins of DNA that carry the genetic information
6- c)Extra-Chromosomal DNA 
7- a) Coronavirus
8- a), b), and c)
9-b) have the effect in resistance to antibiotics
10- d) DNA molecule
11- b) The part of the DNA is transferred by bacteriophage from one bacterium to another
12-c) Inhibition of cell wall synthesis



 









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