Tag: living world and classification of microbes

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Questions Related to living world and classification of microbes

Multiple choice biology living world and classification of microbes pathogen and their mode of transmission economic importance of bacteria and fungi five kingdoms of living organisms


Cells of many protistans, plants, and fungi, but not animals, commonly have

  1. cell wall

  2. ribosomes

  3. plasma membrane

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

(A) The cell wall is a structural layer around types of the cell outside the cell membrane which provides the cell with structural support and protection found in algae, fungi, plants, bacteria and archaea.

(B) Ribosomes are minute particles with associated proteins and RNA to synthesise proteins and it can be found floating in the cytoplasm or attached to the endoplasmic reticulum.
(C) Plasma membrane surrounds the cell wall, which is composed of a phospholipid bilayer arranged back to back and covered in cholesterol and protein molecule.
(D) Mitochondria are rod-shaped organelles, considered the power generators of the cell which converts nutrients and oxygen into ATP. They are not present in bacteria.
Hence, the correct answer is 'cell wall'

Multiple choice biology living world and classification of microbes pathogen and their mode of transmission economic importance of bacteria and fungi five kingdoms of living organisms

Artificial systems of classification were based on

  1. Vegetative characters

  2. Androecium structure

  3. All of these

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Artificial systems of classification were based on morphological characters such as habit, habitat, colour, number and shape of leaves. They were mainly based on vegetative characters or on the androecium structure.

So, the correct answer is 'All of these'.

Multiple choice biology living world and classification of microbes pathogen and their mode of transmission economic importance of bacteria and fungi five kingdoms of living organisms

In Whittaker's five kingdom system of classification, eukaryotes are distributed among

  1. two kingdoms

  2. three kingdoms

  3. four kingdoms

  4. all the five kingdoms
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

R.H. Whittaker proposed a Five Kingdom Classification. The kingdoms defined by him were named Monera, Protista, Fungi, Plantae, and Animalia. Among five kingdoms, only Monera is prokaryotic and remaining four are Eukaryotic.

So the correct option is "four kingdom".

Multiple choice biology living world and classification of microbes pathogen and their mode of transmission economic importance of bacteria and fungi five kingdoms of living organisms

The arrangement of parts in an organism in such a way that the structure can only be divided into similar halves along one plane is known as

  1. Uniplanner symmetry

  2. Radial symmetry

  3. Bilateral symmetry

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

The property of being divisible into symmetrical halves on either side of a unique plane.

So, the correct option is 'Bilateral symmetry'.

Multiple choice botany living world and classification of microbes gram staining microbiology: organisms in industry cell wall and cell membrane

Teichoic acid is present in 

  1. Gram +ve bacteria

  2. Gram -ve bacteria

  3. Spirochaete

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

Teichoic acids are found within the cell wall of Gram-positive bacteria. The main function of teichoic acid is to provide rigidity to the cell wall by attracting cations, such as magnesium and sodium.

Multiple choice botany living world and classification of microbes gram staining microbiology: organisms in industry cell wall and cell membrane

Which one of the following dyes cannot be used for staining chromatin material?

  1. Acetocarmine

  2. Crystal violet

  3. Haematoxylin

  4. Schiff's reagent (Feulgen stain)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Crystal violet dye is used as a histological stain and in Gram's method of classifying bacteria.
Rest all other dyes in option as acetocarmine, haematoxylin and Schiff's reagent are used to stain chromosome.
Thus, the correct answer is option B.

Multiple choice botany living world and classification of microbes gram staining microbiology: organisms in industry cell wall and cell membrane

All the following statements are true about exotoxins except 

  1. They are protein in nature.

  2. Are heat labile.

  3. Produced by Gram + positive bacteria.

  4. Are highly antigenic.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

An exotoxin is a toxin secreted by bacteria. An exotoxin can cause damage to the host by destroying cells or disrupting normal cellular metabolism. Exotoxin is secreted during lysis of the cell.