Explore topic-wise MCQs in Biology.

This section includes 5751 Mcqs, each offering curated multiple-choice questions to sharpen your Biology knowledge and support exam preparation. Choose a topic below to get started.

1.

The First step of Bacterial Replication is
A. Pinching of the plasma membrane
B. Separation of daughter cells
C. Attachment of the dna to the plasma membrane
D. Dna replication
Answer» E.
Discussion
2.

Synapsis occurs during
A. Mitosis
B. Meiosis
C. Both a & b
D. None
Answer» C. Both a & b
Discussion
3.

Which statement about capillaries is correct?
A. Their walls are covered with cilia
B. They warm and humidify inhaled air
C. Their walls are only one cell thick
D. They move mucus through the lungs
Answer» D. They move mucus through the lungs
Discussion
4.

Which of the following pairs is mismatched?
A. Hooke - cell theory
B. Van leeuwenhoek - germ theory
C. Lister - aseptic surgery
D. Jenner - vaccines
Answer» C. Lister - aseptic surgery
Discussion
5.

What sugar is found in RNA?
A. Deoxyribose
B. Ribose
C. Pentose
D. Sucrose
Answer» C. Pentose
Discussion
6.

Which of these is Not a Carcinogen?
A. Cadmium
B. Asbestos
C. Benzene
D. All the above
Answer» E.
Discussion
7.

What sugar is found in DNA?
A. Ribose
B. Deoxyribose
C. Pentose
D. Sucrose
Answer» C. Pentose
Discussion
8.

Which of the following statements is most accurate regarding infection with parvovirus B19?
A. Parvovirus b19 causes severe anemia because it preferentially infects erythrocyte precursors
B. Parvovirus b19 can cause hydrops fetalis via transplacental infection of a fetus in a seropositive mother
C. Parvovirus b19 can be diagnosed by detection of viral rna using pcr or hybridization assays
D. Parvovirus b19 replicates in the host cell nucleus utilizing a virally encoded dna polymerase to create a double- stranded dna intermediate
Answer» B. Parvovirus b19 can cause hydrops fetalis via transplacental infection of a fetus in a seropositive mother
Discussion
9.

How many Nucleotides make up a Codon?
A. 3
B. 4
C. 5
D. 6
Answer» B. 4
Discussion
10.

Nitrogenous Food is
A. Proteins
B. Carbohydrates
C. Salts
D. Lipids
Answer» B. Carbohydrates
Discussion
11.

What carries Blood away from the Heart?
A. Arteries
B. Veins
C. Both a & b
D. None
Answer» B. Veins
Discussion
12.

What are the building blocks of Nucleic Acids?
A. Pentose sugar
B. Dna
C. Rna
D. Nucleotides
Answer» E.
Discussion
13.

What carries Blood back to the Heart?
A. Veins
B. Arteries
C. Both a & b
D. None
Answer» B. Arteries
Discussion
14.

Nucleoli are present during
A. Prophase
B. Anaphase
C. Interphase
D. Prometaphase
Answer» D. Prometaphase
Discussion
15.

Bacteria divide by
A. Binary fission
B. Spirilla
C. Rna
D. Fusion
Answer» B. Spirilla
Discussion
16.

What do genes code for?
A. Ptoteins
B. Dna
C. Rna
D. None
Answer» B. Dna
Discussion
17.

Which feature do Prokaryotic and Eukaryotic cells share
A. Nucleus
B. Dna
C. Nuclear membrane
D. Membrane bound organelles
Answer» C. Nuclear membrane
Discussion
18.

At what temperature do pathogenic bacteria grow best in food?
A. 5 to 15 degrees celsius
B. 15 to 25 degrees celsius
C. 20 to 45 degrees celsius
D. 40 to 65 degrees celsius
Answer» D. 40 to 65 degrees celsius
Discussion
19.

Which of these does not contain a structural protein?
A. Tendons
B. Ovalbumin
C. Muscles
D. Ligaments
Answer» C. Muscles
Discussion
20.

Which of the following does not occur during Mitosis?
A. Spindle formation
B. Condensation of the chromosomes
C. Breakdown of the nuclear membrane
D. Replication of the dna
Answer» E.
Discussion
21.

What is the phase following the metaphas In cell division known as:
A. prophase
B. anaphase
C. telophase
D. extophase
Answer» C. telophase
Discussion
22.

how many contractile vacuoles are there In most species of Paramecium?
A. one
B. two
C. three
D. four
Answer» C. three
Discussion
23.

The cerebral lobes is the speech center is located in ........?
A. frontal
B. parietal
C. temporal
D. occipital
Answer» B. parietal
Discussion
24.

When a human donor gives a pint of blood, how many weeks are required for the body RESERVE of red corpuscles to be replaced?
A. 1 week
B. 3 week
C. 7 week
D. 21 week
Answer» D. 21 week
Discussion
25.

The condition in which there is a DECREASE in the number of white blood cells in humans is called
A. leukocytosis (pron: lew-kO-sigh-toe-sis)
B. leukopenia (pron: lew-kO-pea-nee-ah)
C. leukemia (pron: lew-kee-me-ah)
D. leukohyperia (pron: lew-kO-high-per-e-ah)
Answer» C. leukemia (pron: lew-kee-me-ah)
Discussion
26.

Surplus red blood cells, needed to meet an emergency, are MAINLY stored in which organ of the human body?
A. pancreas
B. spleen
C. liver
D. kidneys
Answer» C. liver
Discussion
27.

Of the following, which mechanisms are important in the death of erythrocytes (pron:eh-rith-reh-sites) in human blood? Is it
A. phagocytosis (pron: fag-eh-seh-toe-sis)
B. hemolysis
C. mechanical damage
D. all of the above
Answer» E.
Discussion
28.

Enzymes are produced by
A. Endocrine glands
B. Exocrine glands
C. Liver
D. Spleen
Answer» C. Liver
Discussion
29.

Genes are made of
A. Carbohydrates
B. Proteins
C. Fats
D. Nucleotides
Answer» E.
Discussion
30.

Which among the following is a Vitamin?
A. Citric acid
B. Follic acid
C. Glutonic acid
D. None
Answer» C. Glutonic acid
Discussion
31.

Water pollution of a river is measured by_______
A. Amount of chlorine dissolve in water
B. Amount of ozone dissolve in water
C. Amount of nitrogen dissolve in water
D. Amount of oxygen dissolve in water
Answer» E.
Discussion
32.

The artificial kidney is a
A. Transplant
B. Machine
C. Another's kidney
D. Other kidney from same body
Answer» C. Another's kidney
Discussion
33.

The book Historia plantrum is written by
A. Aristotle
B. Theophrastus
C. Hipporates
D. Darwin
Answer» C. Hipporates
Discussion
34.

Infection of salivary glands by a virus leads to
A. Tetanus
B. Mumps
C. Pyorrhoea
D. Ulcers
Answer» C. Pyorrhoea
Discussion
35.

In photosynthesis________
A. Light energy is converted into chemical energy
B. Chemical energy is converted into light energy
C. Chemical energy is converted into electrical energy
D. Light energy is converted into mechanical energy
Answer» B. Chemical energy is converted into light energy
Discussion
36.

Organisms need Nutrients in order to
A. Breaking down food
B. Utilize chemical compounds
C. Recycling
D. None
Answer» B. Utilize chemical compounds
Discussion
37.

Which is the Largest Organ in the Human Body?
A. Heart
B. Brain
C. Skin
D. Liver
Answer» D. Liver
Discussion
38.

Metastasis is the process by which _________
A. Cell divide rapidly under the influence of drugs
B. Cancer cell spread through the blood or lymphatic system to other site or organs
C. The chromosome in cell nuclei are attached to the soindle before moving to the anaphase poles
D. Cancer cells are successfully inhibited to divide any further
Answer» C. The chromosome in cell nuclei are attached to the soindle before moving to the anaphase poles
Discussion
39.

Which organelles in the cell, other than nucleus contains DNA?
A. Centriole
B. Goalgi apparatus
C. Lysosomes
D. Mitochondria
Answer» E.
Discussion
40.

Organisms that live in the deep sea are mainly
A. Herbivores
B. Carnivores
C. Detritivores
D. None of the above
Answer» D. None of the above
Discussion
41.

Which of the following is not a function of proteins?
A. Build tissues such as bone and muscle
B. Help to fight disease
C. Nail formation
D. Store and transmit heredity
Answer» E.
Discussion
42.

Study Of Cells Is Called
A. Cellogysm
B. Cell biology
C. Cell organism
D. None
Answer» C. Cell organism
Discussion
43.

From the following pairs, find the one which is correctly matched?
A. Scurvy- thiamine
B. Tuberculosis- ats
C. Tetanus- bcg
D. Malaria- chloroquine
Answer» E.
Discussion
44.

Nitrogen Fixation is carried out primarily by
A. Plants
B. Humans
C. Consumers
D. Bacteria
Answer» E.
Discussion
45.

In which Organelle does Cellular Respiration Occur?
A. Chloroplast
B. Atp and nadph
C. Cytoplasm
D. Mitochondria
Answer» E.
Discussion
46.

Which of the following crops would be preffered for sowing in order to enrich the soil with nitrogen?
A. Wheat
B. Mustard
C. Sunflower
D. Gram
Answer» E.
Discussion
47.

An area of dead myocardial tissue is called
A. An infarct
B. Stenosis
C. An induration
D. Hypertrophy
Answer» B. Stenosis
Discussion
48.

The most healthy edible oil for heart is
A. Almond oil
B. Sesame oil
C. Mustard oil
D. Olive oil
Answer» E.
Discussion
49.

Important component that helps in clotting of the blood is called ____.
A. Haemoglobin
B. Platelets
C. Serum
D. Plasma
Answer» C. Serum
Discussion
50.

Transmission of stimuli from one part of body to other part takes place through __________
A. Muscular tissue
B. Epithelium tissue
C. Connective tissue
D. Nervous tissue
Answer» E.
Discussion