All Free Biology MCQs with Answers

• A. Metaphase
• B. Anaphase
• C. Telophase
• D. Cytokinesis

Explanation: Phragmoplast is formed during cytokinesis. This complex assembly of microtubules, actin filaments and associated molecules act as a…

• A. Controlling active transport
• B. Acting as a membrane blood receptor
• C. Helping cells join together
• D. Regulating the flexibility at the membrane

Explanation: Cholesterol helps to regulate membrane fluidity over the range of physiological temperatures.

• A. Protein channels
• B. Active transport
• C. Endocytosis
• D. Diffusion
• E. Facilitated diffusion

Explanation: Explanation for this question will be added soon.

• A. Option A
• B. Option B
• C. Option C
• D. Option D
• E. Option E

Explanation: Explanation for this question will be added soon.

• A. Sol
• B. Gel
• C. Colloidal
• D. True solution

Explanation: The peripheral parts of a cell are often like gel.

• A. Glycoprotein
• B. Carrier protein
• C. Lipid
• D. Carbohydrates

Explanation: The fluidity of the plasma membrane is primarily controlled by the composition and arrangement of lipids, specifically phospholipids.

• A. Cellulose
• B. Cell
• C. Ribosomes
• D. Penicillin binding protein

Explanation: The cell wall is synthesized by cellulose which is a polymer of beta-glucose.

• A. Wall pressure
• B. Internal pressure
• C. Vacuole
• D. Osmotic pressure

Explanation: "The membrane that bounds vacuole, is called tonoplast which contains a number of active transport systems that pump ions into the vacuole…

• A. Cell wall
• B. Cell membrane
• C. Cytoplasm
• D. Nuclear membrane

Explanation: The plasma membrane of all cells represents the universal boundary between the cell and its surroundings.

• A. Vacuole
• B. Lysosome
• C. Nucleus
• D. Endoplasmic reticulum

Explanation: Nucleolus and nuclear membrane always disappear during mitosis and meiosis.

• A. Semi-permeable
• B. Differentially permeable
• C. Permeable
• D. Not permeable

Explanation: The cell wall is dead and fully permeable. It cannot regulate the entry of solvent or solute molecules.

• A. Proteins are not fixed at their position
• B. Hydrophobic tail facing inward and hydrophilic head facing outward
• C. The two surfaces and halves are not identical
• D. Cholesterol molecules are only present inside

Explanation: The cell membrane is an asymmetric structure. That means that the two sides of the membrane are structurally and functionally different.

• A. Lipid
• B. Comer
• C. Charge pores
• D. Carbohydrates

Explanation: Channel proteins, gated channel proteins, and carrier proteins are three types of transport proteins that are involved in facilitated…

• A. Glycoprotein
• B. Carrier prolein
• C. Lipid
• D. Carbohydrate

Explanation: The amount of cholesterol in animal plasma membranes regulates the fluidity of the membrane and changes based on the temperature of the…

• A. Outer to primary cell wall
• B. In between two primary cell walls
• C. Between the primary cell wall and plasma membrane
• D. Inner to plasma membrane

Explanation: Secondary cell walls in plants are present between the primary cell wall and the plasma membrane

• A. Hydrophobic
• B. Hydrophilic
• C. Globular
• D. Fitamentous

Explanation: According to the fluid mosaic model of the cell membrane, the Hydrophobic zone is embedded inside

• A. Lipids
• B. Corner Proteins
• C. Charged Pores.
• D. Carbohydrates

Explanation: Charged pores, also known as ion channels, are essential components of the cell membrane that facilitate the exchange of materials and…

• A. Chloroplasts
• B. Chromoplasts
• C. Leucoplasts
• D. All of these options are correct

Explanation: Plastids are of three types: 1. "Leucoplasts" --- In Roots ----colourless.

• A. 500X
• B. 250 000X
• C. 500 000X
• D. 100 000X

Explanation: Option B is correct since the typical ( scanning ) electron microscope magnification power is X 250000.

• A. Phospholipids
• B. Extrinsic proteins
• C. Intrinsic proteins
• D. All of these

Explanation: Plasma membrane separates the internal and external environment of a cell.