Biology · Science General

Cell Biology and Structure

3,062 Questions

Cell biology focuses on the structure and function of cellular organelles. Key topics include cellular respiration, DNA inheritance, and energy production. These fundamental biology concepts are crucial for medical entrance and state service examinations.

Cell organelles functionsCellular respiration sitesDNA and ribosomesAnimal cell structurePlant cell components

Cell Biology and Structure Questions

Multiple choice biology organisation of the organism introduction to cell what are the living organisms made of component of the cell

The structure that are involved in the manufacture and supply of energy to the cell are:

  1. Centroies

  2. Nucleoius

  3. Pestide

  4. Mitochondria
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Mitochondria is responsible for manufacturing and supplying chemical energy by releasing energy stored in food molecules and synthesising ATP. It is called the power house of the cell. 

So, the correct option is 'Mitochondria'.

Multiple choice biology caskets of life the cell structure cytoplasm unicellular and multicellular organisms number and shape of cells

Select the correct option:

The best material for the study of structure of cell membrane is

  1. RBC of human

  2. Liver cell

  3. Kidney cell

  4. Muscle cell
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

RBCs lack a nucleus and may other cell organelles thus they are best suited to study cell membrane without any complication.

So, the correct answer is 'RBC of human'.

Multiple choice biology caskets of life the cell structure cytoplasm unicellular and multicellular organisms number and shape of cells

Which of the following show selective permeability?

  1. Cell membrane

  2. Cell wall

  3. Cytoplasm

  4. Protoplasm
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • The cell membrane or plasmalemma is a phospholipid bilayer that are selectively permeable membranes which separate the interior of the cells (cell organelles and cytoplasm) from the outside environment or the extracellular space.
  •  A selectively permeable can be defined as a cell membrane which allows only certain molecules or ions to pass through the membrane by active or passive transport.
  • So, the correct answer is 'Cell membrane'.
Multiple choice biology caskets of life the cell structure cytoplasm unicellular and multicellular organisms number and shape of cells

Cell membranes consist mainly of a

  1. Carbohydrate bilayer and proteins

  2. Protein bilayer and phospholipids

  3. Lipid bilayer and proteins

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
In the fluid mosaic model of the cell membrane, proposed by Singer-Nicolson in 1972, the phospholipid bilayer has integrated as well as peripheral proteins embedded in it. The integrated proteins are found on the inside and span across the bilayer, while the peripheral proteins are found at the periphery of the lipid layers.

So, the correct answer is 'lipid bilayer and proteins',
Multiple choice botany caskets of life the cell structure cytoplasm unicellular and multicellular organisms number and shape of cells diversity and classification in animals cell parameters

Hybridoma cells are

  1. nervous cells of frog

  2. hybrid cells resulting from myeloma cells

  3. only cells having oncogenes

  4. product of spore formation in bacteria.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hybridoma cells are created by fusing a B-lymphocyte (antibody-producing cell) with a myeloma cell (cancerous cell). This fusion allows the resulting cells to produce specific antibodies indefinitely.

Multiple choice botany mineral nutrition in plants mechanism of absorption mineral absorption significance of transpiration

With reference to absorption of minerals, the term 'outer space' represents ______ while 'inner space' represents _______. 

  1. Intercellular space and cell wall; cytoplasm and vacuole

  2. Cytoplasm and vacuole; intercellular space and cell wall

  3. Intercellular space; vacuole

  4. Cytoplasm; vacuole
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In plant mineral absorption, the apoplast (outer space) consists of non-living components like cell walls and intercellular spaces. The symplast (inner space) consists of the living cytoplasm and the vacuole.

Multiple choice botany mineral nutrition in plants mechanism of absorption mineral absorption significance of transpiration

The main constituents of cytoplasm is C, N, O, H. These are derived from-

  1. Protein

  2. Carbohydrate

  3. Water

  4. None of these.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The cytoplasm is primarily composed of water (70-90 percent). The elements C, N, O, and H are fundamental components of water molecules and organic biomolecules dissolved within the aqueous cytoplasm.

Multiple choice botany photosynthesis electron transport system modern concept of photosynthesis photosynthesis in higher plants
Electron Transport System (ETS) is located in mitochondrial

  1. Outer membrane

  2. Inter membrane space

  3. Inner membrane

  4. Matrix
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

An electron transport system (ETS) or electron transport chain (ETC) is a series of coenzymes and cytochromes that take part in the passage of electrons from one carrier to another and to its ultimate acceptor. The various components of ETS are arranged in five kinds of complexes, arranged in a definite sequence in the inner mitochondrial membrane.

So the correct option is C.

Multiple choice botany root - external morphology zones of the root morphology of root root system in plants

Root hair is always.

  1. Very long

  2. Multi cellular

  3. Cuticularized

  4. Unicellular
Reveal answer Fill a bubble to check yourself
A,D Correct answer
Explanation
Root is typically a non-green underground cylindrical structure forming the descending water absorbing axis of the plant which gives rise to endogenous branches and does not possess nodes, leaves and buds. Each functional root is covered at the tip by a root cap. Near their tip the finer roots bear unicellular tubular root hair.
So the correct answer is 'Unicellular'.
Multiple choice biology concept of life living organism living vs nonliving living vs non living

An irreversible or permanent increase in size, mass or volume of a cell, organ or organism is called as ________.

  1. growth

  2. differentiation

  3. dedifferentiation

  4. development
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Growth is defined as a permanent or irreversible increase in thy weight, size, mass or volume of a cell, organ or organism.

Multiple choice mitosis structure of chromosome, cell cycle and cell division cell division biology cell division in embryo development division for growth and reproduction

Power is regeneration is poor in.

  1. Brain cell

  2. Bone cell

  3. Chondroblasts

  4. Striated muscles
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Brain cells (neurons) have very limited capacity for regeneration compared to other tissues like bone or muscle. This is why injuries to the central nervous system are often permanent.

Multiple choice mitosis structure of chromosome, cell cycle and cell division cell division biology cell division in embryo development division for growth and reproduction

Number of cells daily replaced in human body is

  1. $1 \times 10^9$
  2. $5 \times 10^9$
  3. $1 \times 10^{10}$
  4. $5 \times 10^{10}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The human body replaces approximately 1 billion (1 x 10^9) cells daily, primarily through processes like cell turnover in the skin and gut lining.