Tag: non cellular organism : virus

Questions Related to non cellular organism : virus

Hens egg is

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  1. An organ

  2. A single cell

  3. A tissue

  4. None of the above

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Correct Option: B
Explanation:

Hens egg is a single cell structure inside the shell before the fertilization that can be seen by naked eyes. But after fertilization, the cells fused and divide into two cells inside the shell.

Hence, option B is correct.

True nucleus is absent in

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

  1. Green algae

  2. Fungi

  3. Lichens

  4. Bacteria

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Correct Option: D
Explanation:

Bacteria are prokaryotes grouped in Kingdom Monera. Prokaryotes have a pro or primitive karyon. Thus the true nucleus is absent in bacteria. The chromosome, a single, continuous strand of DNA, is localized, but not contained, in a region of the cell called the nucleoid. All the other cellular components are scattered throughout the cytoplasm.

Bacteria are made up of

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

  1. Nucleic acid

  2. Only proteins

  3. Nucleic acid and Proteins

  4. Nucleosides

  5. None of these

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Correct Option: C
Explanation:

Nucleic acids constitute the genetic material and help in cellular expressions in bacteria, while proteins are important for constitutive activities in the bacterial cells. 15% of bacterial cell is protein, while 7% nucleic acids (DNA and RNA).
So answer is -'nucleic acid and proteins'.

A unicellular organism has

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

  1. just one cell

  2. many cells

  3. few cells

  4. no cells

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Correct Option: A
Explanation:

An organism made of just one cell is called an unicellular organism. Bacteria, Amoeba,  Paramoecium and Euglena are some examples of unicellular organisms.

Which of the following is the location of mucilage capsule present in bacteria which serves as an extra covering?

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  1. Outside the cell membrane

  2. Inside the cell membrane

  3. Outside the cell wall

  4. Inside the cell wall

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Correct Option: C
Explanation:

The mucilage capsule present in bacteria serving as an extra covering is present outside the cell because it is a temporary layer surrounding the cell wall and protects the bacteria from antibiotics and dessication.

So, the correct option is C.

Lifecycle of Saccharomyces cerevisiae is 

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

  1. haplontic type

  2. diplontic type

  3. haplo diplobiontic type

  4. none of these

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Correct Option: C
Explanation:
This type of life cycle is represented by haploid and diploid phases, of more or less equal duration, found in Saccharomyces cerevisiae. The haploid cells of opposite mating type normally multiply by budding. Two such cells of opposite mating behave as gametangia and undergo fusion initially only plasmogamy takes place, wherein the nuclei exist separately also called the dikaryotic phase. Later on the nuclei undergo fusion in specialized sac like structures called the ascus to form a diploid zygote, which undergoes meiosis to release the haploid ascospores.
So, the correct answer is 'haplodiplobiontic type'

Bacteria are-

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

  1. Aerobic

  2. Non-aerobic

  3. Aerobic and non aerobic both

  4. None of the above

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Correct Option: A

Oidia resemble yeast in?

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

  1. Fermentation

  2. Sexual reproduction

  3. Being diploid

  4. All of these

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Correct Option: A

Select the wrong statements.
A. Pyruvic acid decarboxylase and alcohol dehydrogenase catalyse fermentation.
B. $NADH+H^+$ is reoxidised to $NAD^+$ in alcohol and lactic acid fermentation.
C. Yeasts poison themselves to death when the concentration of alcohol reaches about $31$ percent.
D. Prolonged fermentation results greater alcohol contents in alcohol beverages.

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

  1. C and D

  2. A and B

  3. B and C

  4. A and D

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Correct Option: A

Bacterial genome consist of 

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

  1. Circular, ssRNA

  2. Circular, dsDNA

  3. Linear, triple stranded DNA

  4. zig-zag DNA

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Correct Option: B
Explanation:

Bacterial genome as that of a bacteria E.coli consists of Double-stranded DNA (ds DNA) which is circular which means it doesn't have ends like eukaryotic chromosomes. E.coli consists of 4.6 x 10$^6$ base pairs(bp).

So, the correct answer is 'Circular, dsDNA'.