Tag: biology

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Questions Related to biology

Multiple choice biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

Correct arrangement of the following in increasing size is
(i) Width of biological membrane.
(ii) Diameter of E.coli DNA
(iii) Human ribosome
(iv) Length of E.coli DNA
(v) Diameter of human liver cell.

  1. i, iii, ii, iv, v

  2. ii, i, iii, iv, v

  3. i, iii, ii, v, iv

  4. ii, iii, i, iv, v
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Answer :
i) Biological Membranes are typically 7.5–10 nm in thickness with two regular layers of lipid molecules.
ii) E coli cells are typically rod-shaped, and are about 2.0 μm long and 0.25–1.0 μm in diameter.
iii) Prokaryotic ribosomes are around 20 nm in diameter.
iv) E.coli chromosomes have about 4.7 x 10^6 base pairs which results in a length of 1.6 mm.
v) Diameter of human liver cell 50–100µm
So correct answer is option C. i, iii, ii, v, iv.

Multiple choice biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

Which of the following cells are round and biconcave in shape?

  1. White blood cells

  2. Red blood cells

  3. Columnar epithelial cells

  4. Nerve cells

  5. Mesophyll cells
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • An erythrocyte is a cell containing large amounts of hemoglobin and specialized for oxygen transport. In mammals, erythrocytes are round and biconcave in shape. 
  • They are devoid of nucleus and other membrane-bound organelles. They derive energy through glycolysis and serve as tiny packets of hemoglobin.
Multiple choice biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

The longest cell in the human body is

  1. Nerve cell

  2. Muscle cell

  3. Liver cell

  4. Kidney cell
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Nerve cell is considered as the longest cell of the body. It is the abundantly traced in the brain. It carries the nerve stimulus from the organs to the brain. It also carries the nerve response from the brain to the effector organs.
So, the correct answer is option A.
Multiple choice biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

Which one is smallest cell?

  1. Bacteria

  2. Parenchyma

  3. PPLO

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

The cell is the structural unit of life with various shapes and size. The size of the cell ranges from 0.5 micrometers to 100 micrometers. Mycoplasma gallicepticum, a parasitic bacterium is thought to be the smallest known organisms with the size from 0.2 to 0.3 micrometer, capable of independent growth and reproduction. Later, the name for mycoplasma was pleuropneumonia-like organisms or PPLO.

Multiple choice biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

.......... are the longest cells in human body.

  1. Nerve cells

  2. Epithelial cell

  3. Mast cell

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

The tissues which cover or protect the body are called epithelial tissues. Cells of the epithelial tissues are tightly packed and have a small amount of cementing material in between them. These are small cells covering the organs and cavities of the body.  
Mast cells are a type of cells belonging to areolar connective tissues. It fills the space around the organs. 
Kupffer cells are star-shaped macrophages present in the liver lining. 
Nerve cells possess a cell body and one or many thin fiber-like axons. Some nerve cells possess axons as long as 1 meter and thus, are the largest cell in the human body. It is also known as the longest cell in the human body. Thus, the correct answer is option A.

Multiple choice biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

Cell size in unicellular organisms is 

  1. 0.5-10 micrometer

  2. 1.5-2.0 micrometer

  3. 2.5-3.0 micrometer

  4. 3.5-4.0 micrometer
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • The cell is the structural unit of life. Unicellular organisms are made up of one cell that performs all the functions. Its size is 0.5-10 micrometers, whereas, in multicellular organisms, cell size is 10-100 micrometers.
Multiple choice biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

Longest cells in human body are________.

  1. Nerve cells.

  2. Bone cells.

  3. Leg muscle cells.

  4. Heart muscle cells.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
ANSWER
The length of the muscle cell is 1-40 micrometers.
Nerve cells possess a cell body and one to many thin, fiber-like axons.
Some nerve cells possess axons as long as 1 meter. 
Therefore, option A is correct.
Multiple choice biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

Large plant cells are

  1. Xylem vessel cells.

  2. Parenchyma cells.

  3. Sieve tube cells.

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

Sclerenchyma, in plants, support tissue composed of any of various kinds of hard woody cells. Mature sclerenchyma cells are usually dead cells that have heavily thickened secondary walls containing lignin. The cells are rigid and nonstretchable and are usually found in nongrowing regions of plant bodies, such as the bark or mature stems. Sclerenchyma is one of the three types of ground, or fundamental, tissue in plants.Sclerenchyma fibers can be found below the epidermis of monocotyledons, organized in two or three layers of cells. They are known as cortical fibers. Thus correct option is D.

Multiple choice biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

Human egg is larger than human sperm because it has

  1. Larger nucleus.

  2. More membranes.

  3. Core cytoplasm.

  4. All of the above.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Human sperm consists of a head and tail, the head carrying the genetic material and tail has mitochondria which derives the movement of sperm. It is very small in size (0.05mm) and a drop of serum contains millions of sperms. The human egg consists of genetic material along with core cytoplasm surrounding nucleus that has all the cellular components such as ribosomes, RNAs which are essential for protein synthesis and which ultimately gives rise to the whole body of an organism. Human egg measures 2cm against human sperm 0.05mm.