Tag: world of virus
Questions Related to world of virus
Histological differentiation is absent in ____________.
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Amoeba
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Hydra
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Cockroach
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Earthworm
In Amoeba, the cell division takes place ____
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Involving changes in the chromatin reticulum
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Without involving changes in the chromatin reticulum
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Leading to reduction in the number of chromosomes
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Without dividing the nucleus
Some bacteria are considered plants as they
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Are green in colour
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Have rigid cell wall
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Have chlorophyll
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Have stomata
In bacteria the site for respiratory activity is found in
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Episome
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Microsome
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Ribosome
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Cell membrane$/$ Mesosome
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.
Sex factor of bacteria is
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RNA
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Sex pili
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F-factor
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Chromosome replicon
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.
Which is not true of bacterial cell wall?
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Not antigenic
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Provides shape to bacterium
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Not stainable with simple dyes
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Made of mucopeptide
Murein of bacterial cell wall is derivative of
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Vitamin
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Fat
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Organic acid
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Sugar
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.
Bacterial cell membrane is made up of
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Chitin
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Cellulose
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Proteins and phospholipids
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Fats
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.
Teichoic acid is present in cell wall of
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Bacteriophage
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Mycoplasma
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Nostoc
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Pneumococcus
Some bacteria have a capsule outside cell wall. It is made of
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Protein
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Cellulose
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Fat
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Mucopolysaccharide
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.