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- Question
Cyanobacteria have
Options- A. a gram-positive cell wall
- B. a gram-negative cell wall
- C. Neither (a) nor (b)
- D. No cell wall
- Correct Answer
- a gram-negative cell wall
- 1. Intracellular structures formed during many viral infections, called __________ , which can directly disrupt cell structure.
Options- A. prokaryotes
- B. chromosomal disruptions
- C. inclusion bodies
- D. cytocidal bodies Discuss
- 2. Viroids are composed of
Options- A. single-stranded DNA
- B. double-stranded DNA
- C. single-stranded RNA
- D. double-stranded RNA Discuss
- 3. Virulent and nonvirulent viruses may not
Options- A. inhibit host cell DNA synthesis
- B. inhibit host cell RNA synthesis
- C. stimulate host cell macromolecule synthesis
- D. degrade host cell DNA Discuss
- 4. Antibodies to which of the following antigens of Bacillus anthracis are protective?
Options- A. Capsular polypeptide
- B. Somatic polysaccharide
- C. Anthrax toxin
- D. None of these Discuss
- 5. Which of the following is a characteristic unique to the ciliates?
Options- A. Use of cilia as a sensory function
- B. Presence of both a macronucleus and several micronuclei
- C. Both (a) and (b)
- D. Possess a light-detecting eye spot Discuss
- 6. Which of the following virus is always detectable after infections?
Options- A. Hepatitis B virus
- B. Herpes simplex virus
- C. Varicella-zoster virus
- D. Cytomegalovirus Discuss
- 7. The expression of gene X (which has promoter Px) is to be monitored. A gene fusion construction for carrying this work will
Options- A. have Px but not the rest of the X coding region
- B. have the promoter of lacZ or some other reporter gene
- C. allow to monitor the expression of all genes with a promoter similar in sequence to Px
- D. give the same information as from a microarray Discuss
- 8. Which of the following best represents the hierarchy of levels of biological classification?
Options- A. Phylum, kingdom, class, order, genus, species, family
- B. Kingdom, phylum, class, order, family, genus, species
- C. Kingdom, phylum, family, class, order, genus, species
- D. Class, order, kingdom, phylum, family, genus, species Discuss
- 9. Cholera toxin is an A-B type toxin in which the B portions bind to a receptor on a host cell and the A portion enters the cell to cause
Options- A. ADP ribosylation of adenylate cyclase that stops production of cAMP
- B. ADP ribosylation of a G protein that locks it into an active form that stimulates adenylate cyclase to make cAMP
- C. cleavage of rRNA that results in disruption of ribosome function
- D. ADP ribosylation of guanylate cyclase that stimulates production of cGMP Discuss
- 10. Which of the following statement is correct?
Options- A. The size and sequence of introns can be deduced from the cDNA sequence
- B. Restriction endonuclease can cleave ss and dsDNA both
- C. Restriction fragment length polymorphism (RFLP) is usually formed in coding sequence of a gene
- D. Amino acid sequence of a protein can be deduced from corresponding cDNA nucleotide Discuss
More questions
Correct Answer: inclusion bodies
Correct Answer: single-stranded RNA
Correct Answer: degrade host cell DNA
Correct Answer: Anthrax toxin
Correct Answer: Both (a) and (b)
Correct Answer: Hepatitis B virus
Correct Answer: have Px but not the rest of the X coding region
Correct Answer: Kingdom, phylum, class, order, family, genus, species
Correct Answer: ADP ribosylation of a G protein that locks it into an active form that stimulates adenylate cyclase to make cAMP
Correct Answer: Amino acid sequence of a protein can be deduced from corresponding cDNA nucleotide
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