Tag: non cellular organism : 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

Hens egg is

  1. An organ

  2. A single cell

  3. A tissue

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

True nucleus is absent in

  1. Green algae

  2. Fungi

  3. Lichens

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

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

Bacteria are made up of

  1. Nucleic acid

  2. Only proteins

  3. Nucleic acid and Proteins

  4. Nucleosides

  5. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
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'.

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

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

  1. Outside the cell membrane

  2. Inside the cell membrane

  3. Outside the cell wall

  4. Inside the cell wall
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

Lifecycle of Saccharomyces cerevisiae is 

  1. haplontic type

  2. diplontic type

  3. haplo diplobiontic type

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
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'
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

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.

  1. C and D

  2. A and B

  3. B and C

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

Yeast cells are typically killed by alcohol concentrations around 12-14 percent, not 31 percent. Prolonged fermentation does not indefinitely increase alcohol content because the yeast dies.

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 genome consist of 

  1. Circular, ssRNA

  2. Circular, dsDNA

  3. Linear, triple stranded DNA

  4. zig-zag DNA
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.