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Biology And Human Welfare Mock Tests

27 questions available

Biology And Human Welfare Mock Test 1

Questions: 27

Sample Questions

NEET Biology
What is the primary function of a selectable marker in a cloning vector?
A To allow identification of recombinants vs non-recombinants
B To facilitate selection of cells that have taken up the vector
C To enable the vector to replicate in the host cell
D To provide a site for restriction enzyme cutting
NEET Biology
Which type of immunity is provided by the transfer of antibodies from mother to fetus through the placenta?
A Natural passive immunity
B Artificial active immunity
C Natural active immunity
D Artificial passive immunity
NEET Biology
Which of the following bacterial structures is primarily responsible for conjugation (transfer of genetic material between bacteria)?
A Capsule
B Pilus (sex pilus)
C Flagellum
D Plasma membrane
NEET Biology
Which of the following statements about malaria is INCORRECT?
A The gametocytes are formed in the bone marrow
B Haemozoin causes damage to red blood cells
C Female Anopheles mosquito is the vector
D Plasmodium falciparum causes the most lethal form of malaria
NEET Biology
Antibodies are proteins produced by:
A B-lymphocytes (B cells)
B T-lymphocytes (T cells)
C Macrophages
D Erythrocytes
NEET Biology
Antibiotics are substances that inhibit or kill microorganisms. Which of the following correctly matches the antibiotic with its target and mode of action?
A Penicillin — inhibits protein synthesis by binding to the 30S ribosomal subunit
B Tetracycline — inhibits cell wall synthesis by blocking peptidoglycan cross-linking
C Streptomycin — inhibits protein synthesis by binding to the 30S ribosomal subunit
D Cycloheximide — inhibits DNA replication by blocking DNA gyrase
NEET Biology
In the nitrogen cycle, which bacteria convert ammonia (NH₃) into nitrites (NO₂⁻)?
A Nitrobacter
B Nitrosomonas
C Azotobacter
D Clostridium
NEET Biology
Which of the following statements about HIV (Human Immunodeficiency Virus) is correct?
A HIV targets and destroys helper T lymphocytes (CD4⁺ T cells), leading to severe immunodeficiency
B HIV is a bacteriophage that infects white blood cells
C HIV primarily attacks red blood cells, causing anemia
D HIV causes the immune system to overproduce antibodies

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