Exam 2

Question 1

The principal source of energy for blood cells as well as the energy that is metabolized in the body of an animal is

Answer 1

Glucose

Question 2

One of the following is a labile source of high energy phosphate in the muscle

Answer 2

Phosphocreatine

Question 3

As discussed in class, about _____ to _____ percent of energy is captured in the useful form of ATP during metabolism

Answer 3

40-60%

Question 4

Which of the following is false? The glycolytic process is

Answer 4

End product of this process is acetyl CoA

Question 5

There are several intermediates in the glycolytic pathway. Which of the following is not an intermediate in this pathway?

Answer 5

a-ketogluterate

Question 6

This enzyme catalyzes a reaction that involves rearrangement of structure

Answer 6

An isomerase

Question 7

All of the following are intermediates in the TCA cycle except

Answer 7

Aconitase

Question 8

A particular mineral is required as a cofactor for at least two enzymes in the glycolytic pathway. What is this mineral?

Answer 8

Magnesium

Question 9

In general, lipids are hydrolyzed into fatty acids and glycerol. When oxidized, fatty acids and glycerol yield

Answer 9

9.4 and 4.3 kcal/g of energy, respectively

Question 10

Essential fatty acids must be supplied in the diets of most animals. An example of essential fatty acid is?

Answer 10

Linolenic

Question 11

The iodine number is one of the ways to evaluate the saturation level of a fat. The higher the iodine number

Answer 11

The less saturated is the fat

Question 12

Unsaturated fatty acid has the tendency to become saturated. In the presence of excess levels of hydrogen and oxygen, the preference will be for the unsaturated fatty acid to add

Answer 12

Oxygen

Question 13

Lipids are high in the level of triglycerides. Most of the lipids in the diets of ruminants are hydrolyzed in the

Answer 13

Rumen

Question 14

Long chain fatty acids and monoglycerides are converted into triglycerides in the intestinal mucosal. These are then surrounded with a lipoprotein membrane to form chylomicrons. These chylomicrons are eventually absorbed into the

Answer 14

Lymphatic system

Question 15

As the room temperature where an animal is kept gets closer to the Lower Critical Temperature (LCT), what would happen to feed consumption

Answer 15

There will be an increase in feed intake

Question 16

The predominant fatty acids in fat that is ingested by animals are listed below except

Answer 16

Arachidonic

Question 17

Glycerol and some short chain fatty acids can enter the circulation through the

Answer 17

Portal circulation

Question 18

Any of the following could be used to stabilize (reduce rancidity in) diets except

Answer 18

Copper salt

Question 19

The amino acids that are liberated from protein hydrolysates are primarily α-amino. This means

Answer 19

The carboxyl and amino groups are attached to the same carbon atoms

Question 20

Which of the following in incorrect

Answer 20

All proteins contain C, H, O, N, and S

Question 21

Usually, the crude protein of a material is determined by first determining the concentration of nitrogen and multiplying it by 6.25. Which of the following is the method through which nitrogen contents of a material can be determined?

Answer 21

Kjeldahl method

Question 22

The amino acid below could be described as

Answer 22

Basic amino acid

Question 23

Which of the following volatile fatty acids produced in the rumen has the highest level of heat incremen

Answer 23

Acetic

Question 24

Basal metabolism is measured in animal under basal conditions. These conditions include

Answer 24

All the above

Question 25

Most of the chemical reactions of nutrients post absorption involved oxidation and reduction reactions. Which of the following is correct

Answer 25

Oxidation is a loss of an electron