Test Your Knowledge - Free MCQ PRACTICE
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DRIVINGTEST
A fresh set of 20 random questions is generated every time you open this page and every time you refresh it.
For each of the following multiple choice questions, choose the most appropriate answer :

1. Enzymes that recognize and cleave specific 4 to 8 base pair sequences of DNA are
A. DNA ligase
B. helicases
C. restriction endonucleases
D. DNA gyrase

2. Normally CO2 and O2 enter a plant by
A. osmosis
B. active transport
C. diffusion
D. evaporation

3. How many nucleotides are there in Ss RNA molecule of picorna virus causing FMD?
A. 1000
B. 5000
C. 8000
D. 10000

4. The element neon (Ne) has eight electrons in its outermost electron shell. How many covalent bonds will Ne readily form?
A. None
B. One
C. Two
D. Four

5. For gene probes to be useful they must
A. be large enough to contain gene-specific sequences
B. be labeled in some manner to allow detection
C. both A and B
D. none of the above

6. Which group of land plants is most restricted to moist environments?
A. Lycophyta
B. Sphenophyta
C. Bryophyta
D. Angiosperms

7. The preserved embryoids are termed as
A. synthetic seeds
B. semi-synthetic seeds
C. natural seeds
D. fermented seeds

8. Which group of plants has the greatest diversity (i.e. the most species) living today?
A. Bryophyta
B. Lycophyta
C. Gymnosperms
D. Angiosperms

9. Which is not true about a photon?
A. It is a packet of light energy
B. The shorter the wavelength, the greater the energy of the photons
C. It is trapped by photosynthetic unit
D. It donates electron to reduce carbon dioxide to glucose

10. The encapsulation of somatic embryos can be carried out by
A. automatic encapsulation process
B. gel complexation
C. both A and B
D. coating proteins

11. The event(s) which does not occur during interphase, is/are
A. Chromatin condenses
B. Protein Synthesis
C. Organelles replication
D. DNA replication

12. Which of the following is an ethylene biosynthesis inhibitor?
A. Citric acid
B. Succinic acid
C. Activated charcoal
D. Silver thiosulphate

13. Which of the following is obtained using processed mRNA molecules as a template?
A. rDNA
B. mDNA
C. cDNA
D. tDNA

14. pH of the fermentation medium for chlorotetracyclins is
A. 5-6
B. 6-7
C. 7-8
D. 8-9

15. pBR 322 has/have which of the following selection marker(s)?
A. Ampr
B. Tetr
C. Both A and B
D. Kanr

16. For culturing, plasma from the adult chicken is preferred to mammalian plasma because
A. it forms a clear and solid coagulum even after dilution
B. it is too opaque
C. it doesn't produce solid clots
D. it forms a semi solid coagulum

17. In angiosperm, the endosperm is
A. haploid
B. diploid
C. triploid
D. none of these

18. What is the normal role of restriction endonucleases in bacterial cells?
A. To degrade the bacterial chromosome into small pieces during replication
B. To degrade invading phage DNA
C. To produce RNA primers for replication
D. All of the above

19. The advantage of using DNA polymerases from thermophilic organisms in PCR is that
A. the DNA polymerases of these bacteria are much faster than those from other organisms
B. the DNA polymerases of these bacteria can withstand the high temperatures needed to denature the DNA strands
C. the DNA polymerases of these bacteria never make mistakes while replicating DNA
D. all of the above

20. Some types of variation are due to changes in the genetic material. What is this type of change called?
A. Fertilisation
B. Mutation
C. Radiation
D. Sterilisation

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