Tag: the cell structure

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

Any organism performed all the activities by single cell is called as

  1. Multicellular

  2. Unicellular

  3. Acellular

  4. Plants
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

An organism which performs and exhibits all functions of life via a single cell, it is an unicellular organism. Such as prokaryotes like bacteria, eukaryotes like yeast are unicellular organisms. They lack conglomerate of cells (tissue) or organ systems to perform specific functions. All the cellular functions for it to be living are performed by the individual cell.  So, the correct answer is 'Unicellular'.

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

Which of the following statements concludes that ruminants are multicellular animals?

  1. They have specialized organs for digestion.

  2. They can reproduce.

  3. They have lungs for breathing.

  4. Both A and C.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Reproduction is the characteristic for living organisms i.e., both unicellular and multi cellular organisms can reproduce irrespective of their cellular level. But, only multi cellular organisms have specialized organs for digestion and respiration/breathing that is GIT (Gastro Intestinal Tract) and Respiratory tract respectively, unlike unicellular organisms who respire and engulf food by general body surface. Thus, digestive tract and respiratory tract are defining feature of multicellular organism (ruminant). 
So, the correct answer is 'Both A and C'.

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

Identify the unicellular organism.

  1. Algae

  2. Amoeba

  3. Snail

  4. Ant
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Some living organisms are made up of once cell only, these are called unicellular. These organisms have a large surface area to volume ratio and rely on simple diffusion to meet their needs. An example of a unicellular animal is Amoeba. Amoeba feed on smaller organisms such as bacteria.

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

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

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Amoeba is unicellular because it consists of a single cell (B) and lacks specialized organs (C), performing all life processes within that single cell.

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

Paramoecium is a multicellular animal.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
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. 

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

Cells are composed of highly independent and randomly interacting components.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  1. Npt II-Kanamycin

  2. Hpt- Hygromycin

  3. Dhfr- Gentamycin

  4. Bar- Bialaphos
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The selectable marker gene dhfr confers resistance to methotrexate, not gentamycin. The other pairs correctly match antibiotic or herbicide resistance genes with their respective selecting agents.

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

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

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Even when glucose is preferred, a basal, low level of lactose permease is constitutively expressed in E. coli, allowing some lactose to enter the cell to induce the lac operon.

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

Name the kinds of cells found in the following places:

  1. Surface of the human skin

  2. Salivery gland

  3. Brain

  4. Inner lining of the wind pipe
Reveal answer Fill a bubble to check yourself
A,B,C,D Correct answer
Explanation

A. merkel cells, keratinocytes, melanocytes andLangerhans cells.

B.epithelial cells, mucous cells.

C. astrocytes, oligodendrocytes andependymal cells.

D. goblet cells, columnar epithelial cells.