1. Which one of the following is a catabolic process carried out by bacteria? A.

Question

1. Which one of the following is a catabolic process carried out by bacteria?

A. Calvin cycle

B. cell division

C. synthesizing

DNAD. breakdown of starch

A. anaerobic respiration

B. abiotic respiration

C. axenic respiration

D. fermentation

E. anoxic respiration

3a.An organism that gets its energy from light is known as a__________.

A. chemotroph

B.heterotroph

C.lithotroph

D.phototroph

3b. These organisms also usually grow as autotrophs, meaning that they require carbon in the form of___________.

A. CH3OH

B. CH4

C, C6H12O6

D. CO2

Explanation / Answer

Ans. #1. Catabolism is the breakdown of biomolecules into simpler one. Breakdown of sucrose into glucose is a catabolic process.

So, correct option is- D. Breakdown of starch

# Calvin cycle synthesizes biomolecules.

# Synthesis of biomolecules is called Anabolism.

# Cell division is NOT a catabolic process.

#2. Correct option- A. Anaerobic respiration.

# Anaerobic respiration is a type of cellular respiration where the terminal electron acceptor is a molecule other than O2, for example, nitrate, sulfate, etc.   

# Fermentation is the conversion of pyruvate into lactate, ethanol, etc. for the regeneration of NAD+. It is NOT an event of cellular respiration- which means complete oxidation of acetyl-CoA (obtained from pyruvate of glycolysis) to produce ATP through oxidative phosphorylation.

#3. Correct option- Phototrophs: The organisms deriving their energy from light are called phototrophs.

# Chemotrophs derive their energy from chemical compounds.

# Chemotrophs derive their energy from inorganic compounds.

# Heterotrophs derive their energy from chemical compounds.

#4. Correct option- D. CO2

Autotrophs (chemoautotrophs, photoautotrophs) use CO2 as the source of carbon.

Those using organic compounds like glucose, methane or methanol as source of CO2 are called heterotrophs.

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