Which antibiotic has bactericidal effect
Erythromycin
Streptomycin
Penicillin
Chloramphenicol
C.
Penicillin
Penicillin has bactericidal effect i.e., they kill bacteria by inhibiting cell wall synthesis.
Erythromycin, Streptomycin, Chloramphenicol produces bacteriostatic effect.
Streptomycin-Streptomycin is a protein synthesis inhibitor. It binds to the small 16S rRNA of the 30S subunit of the bacterial ribosome, interfering with the binding of formyl-methionyl-tRNA to the 30S subunit.
Erythromycin- It inhibits bacterial protein synthesis by binding to bacterial 50S ribosomal subunits; binding inhibits peptidyl transferase activity and interferes with translocation of amino acids during translation and assembly of proteins.
Chloramphenicol- It prevents protein chain elongation by inhibiting the peptidyl transferase activity of the bacterial ribosome. It specifically binds to A2451 and A2452 residues in the 23S rRNA of the 50S ribosomal subunit, preventing peptide bond formation.
Identify the give figure and select the correct option
Neutrophil- phagocytic cell which destroy foreign organisms entering the body.
Eosinophil- their number increases during allergic infection.
Lymphocyte - small sized non-motile and non-phagocytic.
Monocyte - motile and phagocytic in nature.
Assertion: Filarial worm is transmitted to humans by Culex mosquito.
Reason: Culex prefers to breed in fresh water.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Assertion: AIDS and hepatitis B are sexually transmitted diseases.
Reason: There is no permanent cure for both of them
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Which one of the following immune system components does not correctly match with its respective role
Interferons - secreted by virus-infected cells and protect non-infected cells from further viral infection
B-lymphocytes-produces antibodies in response to pathogens into blood to fight with them
Macrophages-mucus secreting cells that trap microbes entering in the body
IgA-present in colostrum in early days of lactation and protect infant from diseases
Sexual stage (gametocytes) of Plasmodium occurs in
Salivary glands of mosquito
Human RBC
Intestine of mosquito
Human liver
Assertion: AIDS is caused by the HIV, a retro-virus.
Reason: Retroviruses have RNA genome.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Select the option having all the correct characteristics.
Structure Percentage Function
Structure Percentage Function
Structure Percentage Function
Structure Percentage Function
Choose the correctly matched pair from the following.
Gonorrhoea, hepatitis B- sexually transmitted diseases
AIDS, gonorrhoea - viral infection
Diphtheria, ringworm - fungal infection
Diphtheria, tuberculosis - protozoan infection
Which of the following is not a character of cancerous cells in our body
Contact inhibition
Neoplasia
Metastasis
Inability for differentiation
