Question

1. Which of these is used for locomotion in an aquatic environment?

		A) endoflagella
		B) fimbriae
		C) pili
		D) all of these

Which of these represents an acidic pH value?

		A) 4
		B) 7
		C) 10
		D) all of these

Microbial growth is determined by an increase in the number of ____________.

		A) mitochondria
		B) chloroplasts
		C) cells
		D) vesicles

A pH value is the -log₁₀ concentration value of _______.

		A) H+ ions
		B) OH- ions
		C) proteins
		D) NaCl

A glycocalyx ____________.

		A) is a sticky polysaccharide found outside the cell
		B) could be in the form of a capsule
		C) could be in the form of a slime layer
		D) all of these

What is an autoclave used for?

		A) bacterial cell quantification
		B) sterilization
		C) freeze drying
		D) none of these

In a protein, ________________ structure involves multiple polypeptide chains.

		A) primary
		B) secondary
		C) tertiary
		D) quaternary

Sugars and starches are ___________.

		A) lipids
		B) nucleic acids
		C) carbohydrates
		D) proteins

Answer 1

Which of these is used for locomotion in an aquatic environment?

Ans. D) all of these

Endoflagella, fimbriae and pili are present on the external surface of the bacterial cells which gives them the property of motility allowing them to locomote.

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Which of these represents an acidic pH value?

A) 4

A pH scale shows the acidity and alkalinity of an substance . In which a substance with pH 7 is Neutral and with lower pH is Acidic .

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Microbial growth is determined by an increase in the number of ____________.

Ans. C) cells

The proliferation of the microbial community is when the microbes divide and reproduce daughter cells.

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A pH value is the -log10 concentration value of _______.

Ans. A) H+ ions

pH is measurement of concentration of the presence of H+ions in the solution. If the concentration of H+ions is high then the solution is acidic and if the concentration is low then the solution is basic.

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A glycocalyx ____________.

Ans. D) all of these

Glycocalyx is considered as layer of slime when the glycoprotein protein is loosely composed. And is known to form a capsule protecting the cell and is primarily composed of polysaccharide.

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What is an autoclave used for?

Ans. B) sterilization

Autoclave is an instrument that uses steam and high pressure to kill microbes, pathogen and spores.

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In a protein, ________________ structure involves multiple polypeptide chains.

Ans.  D) quaternary

A protein structure with multiple polypeptides is said to have a Quaternary structure.

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Sugars and starches are ___________.

Ans. C) carbohydrates

Carbohydrates are biomolecules composed of carbon, hydrogen and oxygen atoms. Starch is a polymeric carbohydrate while sugar is a soluble, sweet tasting carbohydrate.