1. The first antibody to contact invading microorganisms was
a) lgG
b) IgM
c) IgA
d) IgD
2. The light emitted by luminescent bacteria is mediated by the enzyme
a) Coenzyme Q
b) Luciferase
c) Lactose dehydrogenase
d) Carboxylase reductase
3. Pick out the vector using in human Genome project
a) Phagemid vector
b) Yeast artificial chromosomes
c) Cosmid vectors
d) Yeast episomal plasmids
4. Salt and sugar preserve foods because they
a) Make them acid
b) Produce a hypotonic environment
c) Deplete nutrients
d) Produce a hypertonic environment
5. In a fluorescent microscope the objective lens is made of
a) Glass
b) Quartz
c) Polythene
d) None of these
6. Fixation of atmospheric nitrogen is by means of
a) Biological process
b) Lightining
c) Ultraviolet light
d) All of the above
7. Which one of the following fungi is the most serious threat in a bone marrow transplant unit?
a) Candida albicans
b) Aspergillus
c) Blastomyces
d) Cryptococus
8. Direct microscopic count can be done with the aid of
a) Neuberg chamber
b) Anaerobic chamber
c) Mineral oil
d) Olive oil
9. The image obtained in a compound microscope is
a) Real
b) Virtual
c) Real inverted
d) Virtual inverted
10. Enzymes responsible for alcoholic fermentation
a) Ketolase
b) Zymase
c) Peroxidase
d) Oxidase