Tag: world of virus

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Multiple choice botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

Histological differentiation is absent in ____________.

  1. Amoeba

  2. Hydra

  3. Cockroach

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

Amoeba is a unicellular organism; therefore, it lacks the complex histological differentiation found in multicellular organisms like Hydra, cockroaches, or earthworms.

Multiple choice botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

In Amoeba, the cell division takes place ____

  1. Involving changes in the chromatin reticulum

  2. Without involving changes in the chromatin reticulum

  3. Leading to reduction in the number of chromosomes

  4. Without dividing the nucleus
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Through the cell division process one cell splits into two identical cells. There can be two kind of cell divisions- Mitosis and Meiosis. Cell division mitosis takes place in Amoeba for replicating genetic material (chromatin network) into the daughter cells. It is a form of asexual reproduction in unicellular organisms like Amoeba. The process is known as binary fission.
So, the correct answer is 'Involving changes in the chromatin reticulum'
Multiple choice botany the world of microbes bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

Some bacteria are considered plants as they

  1. Are green in colour

  2. Have rigid cell wall

  3. Have chlorophyll

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

Some bacteria, such as cyanobacteria, are photosynthetic and contain chlorophyll, which led to their historical classification as plants.

Multiple choice botany the world of microbes bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

In bacteria the site for respiratory activity is found in

  1. Episome

  2. Microsome

  3. Ribosome
  4. Cell membrane$/$ Mesosome
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In bacteria the site for respiratory activity is found in mesosomes. Mesosomes are folded invaginations in the cell membrane of bacteria. They increases the surface area required for respiration. They contain respiratory enzymes. It is the site of respiratory activity.

Thus, the correct answer is 'Cell membrane/ Mesosome.'

Multiple choice botany the world of microbes bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

Sex factor of bacteria is

  1. RNA

  2. Sex pili

  3. F-factor

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

F-factor is also called as fertility factor. It is the sex factor of bacteria. It allows the transfers of genes from one bacterium carrying the factor to another bacterium lacking the factor by the process of conjugation. It is found in some bacteria only.

Thus, the correct answer is 'F-factor.'

Multiple choice botany the world of microbes bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

Murein of bacterial cell wall is derivative of

  1. Vitamin

  2. Fat

  3. Organic acid

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

The bacterial cell wall is made up of Peptidoglycan or murein. It is a polymer that is made up of sugars and amino acids. The sugar component is made up of alternating N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM). NAM is then attached to an amino acid chain of L-alanine, D-glutamic acid, diaminopimelic acid (DAP) and D-alanine. 

Thus, the correct answer is 'Sugar.'

Multiple choice botany the world of microbes bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

Bacterial cell membrane is made up of

  1. Chitin

  2. Cellulose

  3. Proteins and phospholipids

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

Bacteria is a unicellular prokaryotic organism. It has a cell wall around the cell membrane. The bacterial cell membrane is made up of proteins and phospholipids. the proteins in are randomly distributed in the phospholipid bilayer of the cell membrane.

Thus, the correct answer is 'Proteins and phospholipids.'

Multiple choice botany the world of microbes bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

Teichoic acid is present in cell wall of

  1. Bacteriophage

  2. Mycoplasma

  3. Nostoc

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

Teichoic acids are characteristic components of the cell wall of Gram-positive bacteria. Pneumococcus is a well-known Gram-positive bacterium, whereas the others listed do not possess this specific cell wall structure.

Multiple choice botany the world of microbes bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

Some bacteria have a capsule outside cell wall. It is made of

  1. Protein

  2. Cellulose

  3. Fat

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

Some bacteria have a capsule outside cell wall. It is made up of mucopolysaccharide. The functions of mucopolysaccharide are;

  • It enhances the ability of bacteria to cause disease. 
  • It protects cells from engulfment by macrophages. 
  • It protects cells from desiccation.
Thus, the correct answer is 'Mucopolysaccharide.'