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Biochemistry 3

Total questions: 57

Worksheet time: 2hrs 51mins

Name
Class
Date
1.

What is not correct for acetyl-CoA?

a)

General name for fatty acids

b)

Activated acetic acid

c)

Thioester

d)

Precursor in isopropene

e)

Activated acetic acid

2.

Which of the following alkenes produces tertiary alcohol by acid catalysed hydration?

a)

CH3-CH=CH2

b)

CH3-CH=CH-CH3

c)

CH2=CH2

d)

(CH3)2C=CH2

e)

CH3=CH3-CH2

3.

Phenols are

a)

pheonoxides

b)

Heterocyclic alcohols

c)

Deprotonated to form alcohol

d)

Strong acids

e)

Weak acids

4.

All of the following are common monosaccarides of interest in biochemistry except

a)

Fructose

b)

Glucose

c)

Maltose

d)

Ribose

e)

Galactose

5.

Isoprene is

a)

1,3 pentadiene

b)

2-methyl-1,3-pentadiene

c)

2-ethyl-1,2-hexadiene

d)

2-methyl-1,3-butadiene

e)

3-methyl-1,2-hexapentene

6.

Which of the following names does not fit a real compound?

a)

3-methylpentan-1-one

b)

2-methylpentane-3-one

c)

Butan-2-one

d)

Octan-3-one

e)

All correct

7.

How many asymmetric Centers are present in 2,4,6-trimethylheptane

a)

1

b)

2

c)

3

d)

4

e)

0

8.

Which of the following is optically inactive

a)

50/50 mixture of R and S enantiomers

b)

A meso compound

c)

Every achiral compound

d)

A racemic mixture

e)

All above

9.

Which statement is not correct ?

a)

SH and SR groups are present in some amino acids

b)

Disulfid bridges are present in insulin

c)

Disulfide bridges are present in insulin

d)

Disulfid bridges are formed by oxidation of thiols

e)

Thiols are sulphur analogues of esters

10.

Which pair can react to form a hemiacetal?

a)

CH3COCH and CH3COOH

b)

CH3COCH3 and CH3CH2CHO

c)

CH3COOH and CH3CH2OH

d)

CH3CH2CHO and CH3COOH

e)

CH3CH2CHO and CH3CH2OH

11.

.......of Glucose leads to gluconic acid

a)

Isomerization

b)

Oxidation

c)

Reduction

d)

Glycosidation

e)

Estherfication

12.

The molecular Formula of the common disaccharides in human biochemistry is:

a)

C12H22011

b)

C12H24012

c)

CH20

d)

C6H12O6

e)

C2H2O2

13.

All statements about oxidation of carbonyls are true except:

a)

Tollend test involves reduction of Ag+

b)

Oxidation of ketones produces esters

c)

Fehling‘s test involves reduction Cu2+

d)

Oxidation of aldehydes produces carboxylic acids

e)

Oxidation of primary alcohols produces aldehydes

14.

The N-H bond in amines

a)

Provides hydrogen bonding in primary and secondary amines

b)

In amines is not polar as the O-H bonds in alcohols

c)

Does not exist in tertiary amines

d)

Is polar and therefore smaller amines are souble in water

e)

All correct

15.

What is false for sterols

a)

They are membrane lipids

b)

They are hydrocarbons

c)

They serve as presucators for steroid hormone

d)

With fatty acids they form sterol esters

e)

They have cyclopentanoperhydro skeleton

16.

Phospholipids

a)

Are monoesters of phosphoric acid

b)

Are a class of reserve lipids

c)

Are sterol derivates

d)

Are amphipathic molecules

e)

Are sphingosine derivatives

17.

According to their chemical composition fats are:

a)

Esters of glycerol with three identical saturated fatty acids

b)

Esters of glycerol with three identical unsaturated fatty acids

c)

Esters of glycerol with three predominantly unsaturated fatty acids

d)

Esters of glycerol with thre predominately saturated fatty acids

e)

Simple esters of long chain alcohols

18.

When thiols undergo oxidation

a)

A disulfide is produced

b)

An H atom is lost from each of the two SH groups

c)

Water is formed

d)

A disulfid bridge is formed

e)

All of the listed is correct

19.

In triaglycerols fatty acids are linked to glycerol by

a)

Ester bond

b)

Ether bond

c)

Amide bond

d)

Hydrogen bond

e)

Glycoside bond

20.

What is true for cholesterol?

a)

Can not be Synthesizer by mammals

b)

The precursor in cholesterol biosynthesis is acyl-CoA

c)

The precursor in cholesterol biosynthesis is acetyl-CoA

d)

Cholesterol is the precursor in manylnolyn CoA

21.

What is correct for naturally occurring fatty acids?

a)

The double bond starts at n-3

b)

The unsaturated ones have in general the cis configuration

c)

Double bonds in unsaturated fatty acids are conjugated

d)

If fat contains more saturated fatty acids it’s melting point is lower

e)

In the sn3 position are predominantly unsaturated fatty acids

22.

Dehydration of 2 moles of isopropanol at 140*C gives

a)

Disopropyl ether

b)

Propene

c)

2,4-dimethyloxopenthane

d)

Disopropyl ketone

e)

Isopropanol

23.

Molecules such as erythrose and threaded are referred as a pair of......

D- and L-Therose are mirror images and are referred to as a pair of.......

a)

Diastereomers; enantiomers

b)

Anomers; Enantiomers

c)

Enantiomers; Diastereomers

d)

Diastereomers; Anomers

e)

Anomers; Diastereomers

24.

Which of the following is a secondary alkyle halide?

a)

Isopropyl cholride

b)

Methyl bromide

c)

Probyl bromide

d)

Isobutane chloride

e)

Butyl idodine

25.

Which compound does not contain a heterocyclic ring?

a)

NAD

b)

proline

c)

Heme

d)

Vitamin B12

e)

Serine

26.

Ethers may be used as solvents because they react only with

a)

Oxidising agents

b)

Aldehydes

c)

Reducing agents

d)

Acids

e)

Bases

27.

What is the main reason for the fact that carboxylic acids can undergo ionization

a)

Hydrogen bonding

b)

Dipol-Dipole intermolecular forced

c)

High reactivity

d)

Stabilisation of the carboxylate ion by resonance

e)

Absence of hydrogen

28.

What is not true for acetyl CoA?

a)

Precursor in the biosynthesis of cholesterol

b)

Precursor in the biosynthesis of squalene

c)

Activated acetic acid

d)

General name for activated fatty acids

e)

Thioester

29.

Which of the following statements best describes the meaning of a glycoside?

a)

It is the Enantiomer of a sugar

b)

It is the heniacetal of a sugar

c)

Activated acetic acid

d)

It is the acetal of a sugar

e)

It is the mirror image of a sugar

30.

Which of the following statements regarding primary structure of proteins is true?

a)

The primary structure denotes the sequence of amino acids in a protein

b)

The primary structure denotes the number of amino acids in a protein

c)

The primary structure denotes the van der waals forces

d)

All correct

e)

The primary structure determines the biological activity of a protein

31.

What is correct?

a)

Polyunsaturated fatty acids contain conjugated double bonds

b)

Isopropene is saturated hydrocarbon

c)

All molecules, including sterols switch from boat to chair confirmation

d)

Double bonds in fatty acids have cod confirmation

e)

Double bonds in carotene have cis configuration

32.

What is true for prostaglandins? They

a)

Belong to reserve lipids

b)

Are synthesised from linolic acid

c)

Containe a 6 C Ring

d)

Containe 30 C Atoms

e)

Act as signal molecules

33.

Sex hormones are synthesised from

a)

Dietary sources of cholesterol

b)

Tryacylglycerols

c)

Monoacylflycerols

d)

Cholesterol

e)

Lecithin

34.

Benzonic acid has higher molecular weight in benzene and less in water because

a)

Water has lower freezing point and higher boiling point than benzene

b)

It associated in water and dissociates in benzene

c)

Water is an amphoteric molecule

d)

It dissociates more in benzene than water

e)

It dissociates in water an associates in benzene

35.

All chiral D-sugars rotate plane-pooarized light

a)

+20,0

b)

Counterclockwise

c)

They are optically inactive

d)

Clockwise

e)

In a direction that cannot be predicted but must be determined experimentally

36.

What is not correct about pyridine

a)

Is an aromatic compound

b)

Is basic

c)

Molecular formula is C6H5N

d)

Easily undergos electrophilic aromatic substituition reaction

e)

Is a six membered heterocyclic compound

37.

Glucose and Galactose are

a)

Anomers

b)

Cis trans isomers

c)

Enomers

d)

Epimers

e)

Enantiomers

38.

Which of the following products is formed when hydrogen reacts with 3-methyl-2-butanone?

a)

An acetal

b)

A tertiary alcohol

c)

A primary alcohol

d)

A secondary alcohol

e)

A hemiacetal

39.

The C-terminal amino acid in the peptide Ala-Leu-Gly-His-Pro is

a)

Leucine

b)

Histidine

c)

Aline

d)

Glycine

e)

Proline

40.

Enantiomers are a form of stereoisomers that have

a)

The same functional groups

b)

A plane symmetry perpendicular to the carbon skeleton

c)

A carbon atom bounded to four different groups and the isomers are mirror images

d)

Functional groups situated in different configurations with respect to the double bond

e)

The same carbon skeleton and functional groups but on different sites

41.

Which of the following alcohols would be oxidised to butanone?

a)

Propan-2-ol

b)

2-methylpropan-2-ol

c)

Ethanol

d)

Butan-2-ol

e)

Butan-1-ol

42.

The most polar of the following is:

a)

Progesterone

b)

Bile acid

c)

B-carotene

d)

Vitamin D

e)

Isopropene

43.

Which is not correct for the sterols?

a)

They are basic components of biological membranes

b)

They form sterol esters with fatty acids

c)

Their base is the tetracyclic structure of cyclopentanophenanthrene

d)

They have hydroxyl group on the C3-atom

e)

They are precursors of many steroids

44.

Lemon juice can be used to remove the odor of fish on a persons hands after cleaning fish. The chemical explanation for this is that:

a)

Acid in the lemon juice reacts with the odor-causing amines to form an odourless salt

b)

Pleasant odor from the lemon covers the fish

c)

Lemon juice removes the bitte flavour

d)

Acid in the lemon juice increases the volatility of the odor causing amines

e)

Lemon juice diluted the odor

45.

The relationship between ketones and their corresponding enols is one of

a)

Tautomers

b)

Oxides

c)

Enantiomers

d)

Amino acids

e)

Sohingosines

46.

Retinal contains

a)

An aldehyde group

b)

A carboxyl group

c)

S chiral carbon skeleton

d)

Carbon-chloride bonds

e)

Enantiomers

47.

Bile acid contains

a)

A carboxyl group

b)

Different Cl atoms

c)

Multiple double bonds

d)

Multiple triple bonds

e)

Dienantiomers

48.

Sohingosine contains

a)

Two hydroxyl groups and amino groups

b)

Amino groups and carboxyl groups

c)

Carboxylate groups

d)

Hydroxyl groups and carboxyl groups

e)

All of the above

49.

What is the correct name for CH3CH(CH3)CH2CHO

a)

2-methylbutanal

b)

3-methylbutanal

c)

Isopentanal

d)

Propobutanal

50.

Which of the following statements is true regarding Myoglobin

a)

None of the listed

b)

Is an allosteric protein

c)

Is a tetrameric protein

d)

The oxygen bonding curve is sigmoidal

e)

It is a monomeric protein

51.

In biochemical reactions reduction of a carbonyl group is carried out by

a)

H2

b)

NADH

c)

Pyruvic acid

d)

NaBH4

e)

Lactic acid

52.

Cellulose is not digestable by humans because it contains glucose units linked by.........glycosidic bonds

a)

Alpha 1,4

b)

Beta 1,2

c)

Beta 1,4

d)

Alpha 1,2

e)

Alpha 1,5

53.

Which of the following compounds is hydrolysed to butanoic acid upon heating in H2O

a)

Ethyl Butanoate

b)

Butyl Acetate

c)

AV-methylebromide

d)

AS-methylebromide

e)

None

54.

What is the product of the reaction between sodium and methanol

a)

Ethene

b)

Sodium alcohol

c)

Sodium methoxide

d)

Formaldehyde

e)

Dimethyl ether

55.

What is the main reason for the fact that carboxylic acid can undergo ionization

a)

Stabilisation of the carboxylate ion by resonance

b)

Higher reactivity of alpha hydrogen

c)

Hydrogen bonding

d)

Dipole dipole forces

e)

Absence of alpha hydrogen

56.

Phenoles are

a)

Strong acids

b)

Weak acids

c)

Neutral

d)

Basic

e)

Who the fuck even cares

57.

Isopropene is:

a)

2-Methyl-1,3-butadiene

b)

3-Methyl-1,3-butapropene

c)

4-Ethyl-1,5-propene

d)

3-Methyl-1,3-fuckthisshit

e)

A bitch

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