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. The organism which grows best above 45°C are called
A. psychrophilic
B. mesosphilic
C. thermophilic
D. any of these
2. Which of the following is correct?
A. All members of photolithotrophic autotrophs are also members of algae, but not all members of algae are members of photolithotrophic autotrophs
B. All members of algae are also members of photolithotrophic autotrophs, but not all members of photolithotrophic autotrophs are members of algae
C. All members of photolithotrophic autotrophs are members of algae, and all members of algae are members of photolithotrophic autotrophs
D. No member of photolithotrophic autotrophs is a member of algae
3. Which of the following genera is included in the family Bacteroi-daceae?
A. Bacteroides
B. Fusobacterium
C. Leptotrichia
D. All of these
4. The gram-negative organisms is
A. Actinomyces
B. Bacillus
C. Clostridium
D. None of these
5. Most spoilage bacteria grow at
A. acidic pH
B. alkaline pH
C. neutral pH
D. any of the pH
6. The bacteria involved in the production of dental caries is/are
A. Streptococcus mutans
B. S sanguis
C. Both (a) and (b)
D. Streptococcus pyogenes
7. Xylose lysine deoxycholate (XLD) agar is better selective medium than the deoxycholate citrate agar (DCA) because
A. it is selective
B. it imparts better growth
C. it contains high salt concentration
D. it is less inhibitory to S. Dysentriae and S. flexneri
8. Which of the following bacteria is susceptible to thiophen-2-carboxylic acid hydrazide?
A. M bovis
B. Mycobacterium tuberculosis
C. M chelonei
D. M fortuitum
9. Reverse transcriptase is a useful enzyme to have when
A. an RNA virus converts its RNA to DNA
B. there are no host cells present
C. nutrients are scarce
D. spikes are forming in the new virus
10. Which of the following is not true regarding IgE antibodies
A. It mediates release of histamine and other chemical mediators
B. It is the primary antibody involved in allergic reactions
C. It is involved in anti-parasitic immune responses
D. May cross the placenta and fix complement
11. Cycloserine inhibits
A. alanine racemase
B. D-alanyl - D-alanine synthetase
C. Both A and B
D. amidase
12. In DNA sequencing, the primer
A. specifies where the sequence ends
B. specifies where the sequence begins
C. both A and B
D. generates variety of different sized fragments
13. Which algal division is divided up into three main groups consisting of the golden-brown algae, the yellow-green algae and the diatoms?
A. Chlorophyta
B. Chrysophyta
C. Phaeophyta
D. Pyrrophyta
14. The immediate source of the flat sour bacteria is usually the
A. plant equipment
B. sugar
C. starch
D. soil
15. CMV infection immediate diagnosis by?
A. Direct DNA estimation
B. Antigen detection
C. Isolation of the virus
D. ELISA for serum antibody
16. In cellular metabolism, O2 is used
A. to provide electrons for photophosphorylation
B. in glycolysis
C. as a terminal electron acceptor
D. in the Krebs cycle
17. An endergonic reaction is one that
A. requires energy in order to proceed
B. releases energy for work
C. gives off much heat
D. looses energy
18. Genetic variations are
A. temporary
B. influenced by the environment
C. stable
D. not heritable
19. In chilled shrimp __________ is chiefly responsible for spoilage.
A. Achromobacter
B. Pseudomonas
C. Micrococcus or Bacillus species
D. Molds or yeasts
20. Which of the following characteristic of the Rotavirus was important for the construction of the Rotashield vaccine?
A. The possession of a segmented RNA genome
B. A limited number of capsule types
C. The ability of monkey Rotavirus strains to cause serious illness (diarrhea) in human beings
D. The ability of the Rotavirus to be transmitted faster
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