Tag: number and shape of cells

Questions Related to number and shape of cells

Which of the following characteristics concludes that Amoeba is a unicellular animal?

botany caskets of life the cell structure multicellular organisms number and shape of cells

  1. It is able to move.

  2. It has a single cell.

  3. It lacks specialized organs for various function.

  4. Both B and C

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Correct Option: D

Paramoecium is a multicellular animal.

botany caskets of life the cell structure multicellular organisms number and shape of cells

  1. True

  2. False

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Correct Option: B
Explanation:

The organisms can be broadly classified into two groups, namely unicellular organisms and multicellular organisms depending upon the number of cells. Unicellular organisms are made up of only one single cell. Examples include Amoeba, Paramecium, yeast, bacteria. Multicellular organisms are those organisms that are made up of more than one cell. Examples include human beings, animals.

Hence the statement paramoecium is a multicellular animal is false. 

Cells are composed of highly independent and randomly interacting components.

botany caskets of life the cell structure multicellular organisms number and shape of cells

  1. True

  2. False

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Correct Option: B
Explanation:

The cell is a basic biological unit of living organisms.

A cell contains different membrane-bound organelles which are structural and functional units constructed from several macromolecules bonded together.A typical animal cell contains, the nucleus which possesses genetic material DNA, mitochondria to generate energy, nucleolus in the nucleus to produce ribosomes, ribosomes to produce proteins and endoplasmic reticulum which packages and transports proteins, sugars and lipids to Golgi bodies to distribute them through lysosomes to different parts of the cell. All organelles are anchored in cytoplasm of the cell and work in harmony with each other.
Therefore the option B is correct.

Which one of the following pairs of selectable marker genes and substrates used to select transformed cells is not correctly matched?

botany caskets of life the cell structure multicellular organisms number and shape of cells

  1. Npt II-Kanamycin

  2. Hpt- Hygromycin

  3. Dhfr- Gentamycin

  4. Bar- Bialaphos

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Correct Option: A

In the presence of glucose and lactose. Escherichia coli utilizes glucose. However, lactose also enters the cells because.

botany caskets of life the cell structure multicellular organisms number and shape of cells

  1. low level of permease is always present in the cell

  2. it uses the same transporter as glucose

  3. it diffuses through the bacterial cell membrane

  4. it is transported through porins

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Correct Option: A

Name the kinds of cells found in the following places:

botany caskets of life the cell structure multicellular organisms number and shape of cells

  1. Surface of the human skin

  2. Salivery gland

  3. Brain

  4. Inner lining of the wind pipe

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Correct Option: A,B,C,D
Explanation:

A. merkel cells, keratinocytes, melanocytes andLangerhans cells.

B.epithelial cells, mucous cells.

C. astrocytes, oligodendrocytes andependymal cells.

D. goblet cells, columnar epithelial cells.

Most of our cells are surrounded by:

botany caskets of life the cell structure multicellular organisms number and shape of cells

  1. blood

  2. interstitial fluid

  3. pure water

  4. air

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Correct Option: D
Explanation:

Most of our cells are surrounded by air.

So, the correct option is 'air'.

Some organs are used in more than one system.

botany caskets of life the cell structure multicellular organisms number and shape of cells

  1. True

  2. False

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Correct Option: A
Explanation:

There are certain organs which are parts of more than one system and perform functions for both of them. For example, the pancreas produces hormones where they have an endocrine role ad also secrete digestive juices being a part of digestive system. Similarly, male urethra acts as a duct for both male sperms as well as urine, thereby acting as a part of both reproductive system and excretory system. Bone marrow is a part of skeletal; as well as the circulatory system as it also produces RBC's and WBC'S. 

Thus, the correct answer is option A. 

Which of the following cells can be seen with a naked eye?

botany caskets of life the cell structure multicellular organisms number and shape of cells

  1. Egg cell of a hen

  2. Neurons of a giant squid

  3. Cells of the elephant's brain

  4. No single can be seen with a naked eye

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Correct Option: A
Explanation:

In all mammals, the ovum is fertilized inside the female body. typically visible to the naked eye without the aid of a microscope.

So, the correct option is 'Egg cell of a hen'.

Which  is the correct order for levels of organization in humans

botany caskets of life the cell structure multicellular organisms number and shape of cells

  1. Cell $\rightarrow$ Tissue$\rightarrow$Organ$\rightarrow$Organ system$\rightarrow$Organism

  2. Cell$\rightarrow$Organ$\rightarrow$Organ system$\rightarrow$Organism

  3. Cell$\rightarrow$Tissue$\rightarrow$Organ$\rightarrow$Organism

  4. Cell$\rightarrow$Tissue$\rightarrow$Organism

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Correct Option: A
Explanation:

Cells are grouped into tissues, tissues are grouped into organs, different organs are grouped into organ systems and many organ systems come together to form complex organisms like human beings.