Specific immunity is due to which of the following WBCs a. basophils b. eosinoph

Question

Specific immunity is due to which of the following WBCs a. basophils b. eosinophils c. monocytes d. lymphocytes Inhibits growth of bacteria but does not kill a. bacteriocidal agent b. bacteriostatic agent c. pasteurization d. disinfectant Binds to bacterial ribosomes to inhibit protein synthesis a. penicillin b. polymixin c. tetracycline d. rifamycin Replication, transcription and translation are which of the following respectively a. DNA, RNA, and protein synthesis b. protein, RNA, and DNA synthesis c. protein, DNA, and RNA synthesis d. RNA, protein, and DNA synthesis Base substitution mutations may cause the production of a. an active, modified protein b. an inactive protein c. an unchanged, active protein d. all of these Mutation least likely to be harmful a. frame shift mutation b. neutral mutation c. point mutation d. missense mutation The lac operon is a. repressible b. inducible c. constitutive d. repressed by its gene products The F plasmid may be transferred to other bacteria through a. conjugation b. transduction c. transformation d. mutation The location at which a pathogen enters a host is called the a. portal of entry b. mode of transmission c. mouth d. parenteral area A large number of people become i11 with the same disease on a global basis a. endemic b. epidemic c. pandemic Can be used to determine if two bacterial cultures are identical a. biochemical assay b. DNA fingerprinting c. Gram stain d. serological tests

Explanation / Answer

1) d.Lymphocytes fight against specific foreign substances like bacteria and viruses .

2) b.Bacteriostatic agents inhibits growth of bacteria by interfering the DNA replication,protein production of the bacterial cellular metabolism.

3) c.Tetracycline binds to the 30s ribosome and blocks the initiation of 70s formation complex., thus inhibiting protein synthesis.

4) c.Proteins undergoes replication ,DNA undergoes transcription and reduces to RNA , RNA undergoes translation to form proteins .

5) d.Addition or removal of nucleotide base causes mutations which results in the formation of active modified protein or inactive protein or active unchanged protein .

6) b.Neutral mutations are the changes in the sequence of base pairs of DNA which are neither beneficial nor harmful to the life of the organism.

7) Lac operon is inducible as it is in turned off state until a inducer attaches to it.

8) F plasmid is replicated in F positive bacteria and transferred to the F negative bacteria through the conjugation tube,this process is called conjugation.

9) a.The location at which the pathogen enters is called the portal of entry.

10) c.Pandemic,diseases which are commonly found in most of the individuals of a population are known to be pandemic diseases.

11) c.Gram staining can help in identifying two similar cultures of bacteria.Bacteria are classified into two types which are gram positive bacteria which take up the gram stain and gram negative bacteria which doesn't take up the gram stain.

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