Tag: number and shape of cells

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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.

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

Some organs are used in more than one system.

  1. True

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

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

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

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.

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

Which  is the correct order for levels of organization in humans

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