Question

BIOCHEMISTRY ASSIGNMENT

Please use your understanding to address the few concerns below

* Required

Index Number: *

Your answer

Program:

Choose

BSc Midwifery

BSc Nursing

Which of the diagrams illustrates the way in which the rate of an enzyme-controlled reaction depends on substrate concentration? *

Captionless Image

A

B

C

D

When starch and amylase are mixed in the presence of iodine solution, the blue-black colour rapidly disappears. This is due to the formation of which molecule? *

glucose

glycogen

sucrose

maltose

Which of the following enzyme groups can catalyse oxidation reactions? *

phosphorylases

isomerases

hydrolases

dehydrogenases

The graph below shows an enzyme-controlled reaction. The enzyme concentration is kept constant. At concentrations of substrate greater than X, which of the following statements is true? *

Captionless Image

The rate of reaction is limited by enzyme concentration.

The rate of reaction tends towards zero.

The substrate has an inhibitory effect.

The products have an inhibitory effect.

Enzymes differ from inorganic catalysts in that they are highly specific. Which property of an enzyme is responsible for this specificity? *

The insoluble nature of enzymes.

The high molecular mass of enzymes.

The surface configuration of enzymes.

The absence of metallic ions in an enzyme.

Which of the following enzyme catalyzes the first step of glycolysis? *

Hexokinase

Pyruvate kinase

Glucokinase

Phosphofructokinase-1

What is the general term used for the anaerobic degradation of glucose to obtain energy? *

Anabolism

Oxidation

Fermentation

Metabolism

Whenever the cell’s ATP supply is depleted, which of the following enzyme’s activity is increased? *

Hexokinase

Pyruvate kinase

Glucokinase

Phosphofructokinase-1

Cleavage of Fructose 1, 6-biophosphate yields ___________

Two aldoses

Two ketoses

An aldose and a ketose

Only a ketose

Clear selection

Dihydroxyacetone phosphate is rapidly and reversibly converted to ___________

Glyceraldehyde 3-phosphate

1, 3-bis-phosphoglycerate

Fructose 1, 6-bisphosphate

Fructose 6-phosphate

Clear selection

Which of the following is not an important precursor of glucose in animals? *

Lactate

Pyruvate

Glycerol

Glucose 6-phosphate

Which of the following statements is false about gluconeogenesis? *

rom the hydrolysis of tri-acyl-glycerol, fatty acids can be used as a carbon source

From red blood cells, lactate can be used as a carbon source

From the hydrolysis of tri-acyl-glycerol, glycerol is converted to glucose in gluconeogenesis

From muscle vigorous muscle activity, lactate can be used as a carbon source

Which enzyme catalyzes the conversion of pyruvate to oxaloacetate? *

Pyruvate carboxylase

Pyruvate dehydrogenase

Pyruvate kinase

Phosphofructokinase-1

Oxaloacetate is reduced to malate by ____________ *

Pyruvate carboxylase

Malate dehydrogenase

Pyruvate kinase

Phosphofructokinase-1

Formation of one molecule of glucose from pyruvate requires ____________ *

4 ATP, 2 GTP and 2 NADH

3 ATP, 2 GTP and 2 NADH

4 ATP, 1 GTP and 2 NADH

2 ATP, 2 GTP and 2 NADH

What is lactose maldigestion? *

Inability to digest lactose in foods

Increased ability to digest lactose in foods

Genetically programmed loss of lactase

Both A and C

What are some of the symptoms of lactose intolerance? *

Headaches an nausea

Skin redness/flushing, hives

bloating, cramps, flatulence, abdominal discomfort

None of the above

What does dietary management of lactose maldigestion entail? *

Avoid all dairy products

At least 250mls milk spread across day with meals, hard cheese, yoghurt

Food challenges with dairy products, spread 3 days apart

None of the above

What are the implications of restricting dairy foods on health outcomes with real or perceived lactose intolerance? *

Low calcium intakes, poor bone health and missing out on health benefits

Weightloss for individuals with obesity

Both A and B

None of the above

Can tolerance to lactose be built up? *

No, it is genetically determined

Yes, as production of lactase enzyme slowly increases

Yes, due to colonic adaptation

both C and D

When energy depleted elements associated with a proton are accepted by an organicmolecule, the process is called *

Option Fermentation

Respiration

Anabolism

Catabolism

In the following terms which is not the definition of fermentation process *

Do not require an electron transport system

Use an organic compound as the final electron acceptor

Use an inorganic compound as the final electron acceptor

Alcohol is formed from sugar

Pasteur effect discovered in 1857, is *

Inhibiting effect of oxygen on the fermentation process

Aerating yeasted broth causes yeast cell growth to decrease, while conversely,

fermentation rate increases

A and B

All of these

Which of the following is not a product of fermentation? *

Lactate

Oxygen

Carbon dioxide

Ethanol

Production of ____________ occurs in the fermentation of grains *

Must

Brine

Lactic acid

Carbon dioxide

Fructose intolerance is to_____________? *

Fructose only

Fructose and glucose

Sucrose only

Fructose and sucrose

This is the most common test for fructose malabsorption: *

Colonoscopy

Hydrogen breath test

Angioplasty

Lugol's test

A monosaccharide found in honey and agave nectar is called: *

Glycogen

Fructose

Cellulose

Starch

A medical condition of fasting hypoglycemia with damages to the kidney due to excess accumulation of fructose 1-phosphate in the proximal convulated tubules is ____________? *

Type 1 fructosemia

Type 2 fructosemia

Type 1 fructosuria

Type 2 fructosuria

All the following are true abut type 3-fructosuria except *

increased fructose 1-phosphate

increased fructose 1,3-bisphosphate

increased fructose 1,6-bisphosphate

absence of fructokinase

Increased galactose level in blood circulation is called_____ *

Hypoglycemia

Hyperglycemia

Galactosemia

Galactosuria

Which of the following enzymes is not part of the metabolic pathway for the catabolism of galactose *

Galactomutase

Phosphoglucomutase

Galactose 1-phosphate uridylyltransferase

UDP-Galactose 4-epimerase

In galactosemia, the following organs are damaged except___________ *

The liver

The Kidneys

The spleen

The brain

Which enzyme converts galactose to an alcohol called polyol in the eyes *

Galactose mutase

Galactose reductase

NADPH reductase

Hexokinase

Accumulation of galactitol/dulcitol in the lens damages tissue through __________ *

sopacification

spacification

opacification

gapacification

Answer 1

Amylase, that is found in our human body has the function to catalyzes specificaly the breakdown of our starch. When these amylase reacts with that of the starch molecules then , it will be cuts off into those disaccharide like the maltose that specificaly has about 2 Glucose molecules that are togather linked. As this specific Reaction in presence of iodine proceeds it will lead to the lessening of the starch and increase in the number of maltose

The change in colour is disappeared as maltose is formed so option a , b and c is wrong

Option d is the answer