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Worksheets

Page 1

Total questions: 10

Worksheet time: 2mins

Name
Class
Date
1.

Which microorganism is responsible for the fermentation of milk into yogurt?

a)

Lactobacillus bulgaricus

b)

Escherichia coli

c)

Saccharomyces cerevisiae

d)

Streptococcus thermophilus

2.

What is the primary substrate utilized in fermentation?

a)

Protein

b)

Carbohydrate

c)

Fat

d)

Nucleic acid

3.

Yeast ferments glucose to ethanol. Which co-product is released to the environment?

a)

Nitrogen gas

b)

Carbon dioxide

c)

Hydrogen gas

d)

Ozone

4.

During lactic acid fermentation in muscle, which molecule accepts electrons from NADH to regenerate NAD+?

a)

Pyruvate

b)

Citrate

c)

Acetyl-CoA

d)

Oxaloacetate

5.

Which condition most strongly favors anaerobic fermentation in a bioreactor?

a)

Oxidative metabolic flux

b)

High dissolved oxygen

c)

Strict oxygen exclusion

d)

Continuous aeration

6.

In which type of fermentation is yeast most commonly involved?

a)

Alcoholic fermentation

b)

Lactic acid fermentation

c)

Acetic acid fermentation

d)

Butyric acid fermentation

7.

During alcoholic fermentation, what is the primary starting substrate yeast metabolizes?

a)

Fats

b)

Glucose

c)

Proteins

d)

Nucleic acids

8.

Which pathway provides pyruvate that is subsequently reduced in alcoholic fermentation?

a)

Urea cycle pathway

b)

Beta-oxidation pathway

c)

Glycolytic pathway

d)

Pentose phosphate pathway

9.

Compared to lactic acid fermentation, alcoholic fermentation primarily differs in which main end product?

a)

Ethanol alcohol

b)

Lactate anion

c)

Carbon dioxide gas

d)

Acetate ion

10.

Which organism class commonly carries out lactic acid fermentation rather than alcoholic fermentation?

a)

Yeast fungi

b)

Lactic acid bacteria

c)

Acetic acid bacteria

d)

Clostridium species