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Chapter 16: Q. 16.40 (page 571)

How is the LDHisoenzyme in the heart different from the LDHisoenzyme in the liver?

Short Answer

Expert verified

The heart's LDHisoenzyme has had only H polypeptide subunits, while the liver's LDH isoenzyme comprises only M polypeptide subunits.

Step by step solution

01

Introduction.

Isozymes are frequently observed using electrophoretic mobilities. All lifeforms necessitate several chemical copies of specific enzymes to achieve their full biological potential.

02

Given Information.

Lactic acid dehydrogenase, or LDH, is an oxidase protein source.

574-16-46

In LDHisoenzyme, MandN amino subunits have already been recognized.

03

Explanation.

The heart's LDH isoenzyme has justH polypeptide subunits, whilst the liver's LDH isoenzyme has only M polypeptide subunits.

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Most popular questions from this chapter

Draw the structure of each of the following amino acids at physiological pH:

a. glycine

h. T

c. glutamate

d. Phi

Ethylene glycol HO鈭�CH2鈭�CH2鈭�OHis a major component of antifreeze. If ingested, it is first converted to HOOC-CHO oxoethanoic acid and then to HOOC-COOH oxalic acid, which is toxic added to a radiator to prevent freezing and boiling.

a. What class of enzyme catalyzes the reactions described?

b. The treatment for the ingestion of ethylene glycol is an intravenous solution of ethanol. How might this help prevent toxic levels of oxalic acid in the body?

Indicate whether each of the following would be a substrate(S)or an enzyme (E):(16.4)

a.lactose

b.lipase

c.amylase

d.trypsin

e.pyruvate

f.transaminase

Match the terms (1) active site, (2) lock-and-key model, and (3) induced-fit model with each of the following:

a. the portion of an enzyme where catalytic activity occurs

b. an active site that adapts to the shape of a substrate

c. an active site that has a rigid shape

If glutamate were replaced by proline in a protein, how might the tertiary structure be affected? (16.1,16.3)
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