TMA Solutions: BIO213 - Chemistry of Amino Acids and Proteins

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Adele
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TMA Solutions: BIO213 - Chemistry of Amino Acids and Proteins

Postby Adele » Sat Jul 07, 2018 4:19 am

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1 One of these structral proteins is found in spider's web

fibroin


2 One of these is not a defensive protein

thyrotropi n


3 One of these is a regulatory protein

Insulin


4 All these are fibrous proteins except

Albumin


5 Which of these is the protein component of nucleoprotein

Histone


6 What is the prothetic group in the protein ceruloplasmin

Copper


7 All but one of these are simple proteins

hemoglobi n


8 One of these is produced by the action of cellulase on cellulose

starch


9 Which of these is the substrate of ptyalin

starch


10 Which of these coenzymes mediates one carbon group transfer reactions

Tetrahydofolate


11 One of these terms is the name given to the protein part of an enzyme

Apoenzyme


12 All these are coenzymes except

Thiam ine


13 Which of these coenzymes is involved in the mediation of carboxylation reactions

Biotin


14 Which of these statements is not true of enzyme active site

It binds to substrates via very strong forces.


15 An enzyme with Enzyme Commission Number EC 6.3.2.11 belongs to one of these classes

ligases


16 Which of these enzymes catalyse the breakingof bonds without adding water

lyases


17 Which of these enzymes groups catalyse the transfer of hydrogen

oxidoreductases


18 What is the end product of the action of alcohol dehydrogenase on alcohol

aldehyd e


19 Which of these enzymes act on simple sugars

Amylo psin


20 Which of these statements is not true of enzymes

They cannot be denat ured






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Adele
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Re: TMA Solutions: BIO213 - Chemistry of Amino Acids and Proteins

Postby Adele » Sat Jul 07, 2018 4:21 am

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21 In a peptide chain residues are numbered from____

The N-terminal


22 Mention the amino acid that yields a yellow colour when it reacts with Ninhydrin.

Proline


23 Polymers composed of few (3-10) amino acids residues are known

Oligopep tides


24 Amino acid polymers with molecular weight less than 10,000 are called

Peptides


25 The following are examples of gel materials except ______________________

Amylose


26 What is the term for stereoisomers that are mirror images of each other?

Enantiomers


27 An example of an uncommon amino acid that acts as a hormone.

Epinep hrine


28 Which of these uncommon amino acids is a precursor of arginine

Citrulline


29 Calculate the pKa of lactic acid given that at pH 4.8, the concentration of lactic acid and its conjugate base is 0.001 and 0.087 M respectively.

2.86


30 Which of these statements is not true of a buffer system

the buffer system is irreversible


31 Which of these is not a peptide found in living systems?

Proline


32 One of these groups plays an important role in Sakaguchi reaction

guanidinium group


33 Alanine has only one chiral center, how many stereoisomers does it have?

2


34 The α-carboxyl group can react with ammonia to yeild one of the following

Amide


35 An example of an amino acid whose side chain is an aliphatic chain terminating in an acidic carboxyl is_______

Aspartate


36 One of these amino acids will not give a purple colour with Ninhydrin

Proline


37 What is the function of the gel used in gel filtration?

Acts as molecu lar sieve


38 One of these staements is not true of peptides

In a peptide, amino acid residue is linked to its neighbour in a tail-to head manner

39 Which of these amino acids forms a red precipitate with bromine water?

Arginine


40 When amino acids react with Ninhydrin all but one of these substances is formed.

Water





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Adele
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Re: TMA Solutions: BIO213 - Chemistry of Amino Acids and Proteins

Postby Adele » Sat Jul 07, 2018 4:24 am

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41 Which of the following is useful in spectrophotometric measurement of amino acids?

Ninhydrin reaction


42 Two cysteine molecules form ________________.

Cystine


43 How many functional groups are in a typical amino acid?

4


44 One of these amino acids reacts with formaldehyde with sulphuric acid to give a bluish-purple colouration

Tryptoph an


45 All but one of these amino acids is optically active.

Glycine


46 Which of these uncommon amino acids is a constituent of penicillin antibiotics?

Penicillamine


47 Which of these amino acids will form red complexes with Million's reagent

Tyrosine


48 What is the symbol of Aspartate?

D


49 Which of these reactions is peculiar to the indole-ring of tryptophan?

Reaction with formaldehyde


50 Which of these statements is incorrect?

Aldehyde, ammonia and carbon monoxide are p roducts of Ninhydrin reaction


51 Which class of protein are known as first-class proteins?

Complete


52 When cysteine reacts with iodoacetate, one of the products formed is

Hydro gen iodide


53 Which of these amino acids will form give a yellow coloration with concentrated nitric acid

Tryptophan


54 Amino acid polymers with molecular weight greater than 10,000 are called _____________.

Proteins


55 Amino acids that occur in conjugated forms as components of proteins are called

Common amino acids


56 In the prsence of a strong acid amino acids react with alkanol to give one of the following

Ester


57 One of these is a transport protein.

Serum albumin


58 What is the catalyst involved in the xanthoproteic reaction of aromatic ring of phenylalanine?

Sulphuric a cid


59 The structures of the common amino acids are similar except with respect to their

Side chain


60 What is the pH of an acid buffer solution containing 0.1 M sodium ethanoate and 0.1 M ethanoic acid with Pka 4.8?

4.8




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Adele
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Re: TMA Solutions: BIO213 - Chemistry of Amino Acids and Proteins

Postby Adele » Sat Jul 07, 2018 4:26 am

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61 One of these proteins is involed in low light vision

rhodopsin


62 Which of these is a contractile protein

myosin


63 Which of the following not true of enzymes?

Enzymes are activated by inhi bitors


64 Which of these is a structural protein

hemoglobin


65 Which of these is a transport protein?

Serum albumin


66 The percentage of Nitrogen usually found in protein is ________

16


67 All proteins are made up of _____ standard amino acids

20


68 One of these is not true of proteins

Proteins are highly soluble in water


69 Which of these statements is not true of proteins

They are formed by a linkage between an α-amino group of one amino acid and the α-am ino group of another acid


70 One of these describes how the chains of the secondary structure interact through the R groups of the amino acid residues

Tertiary structure of protein


71 Which of these is not a simple protein?

nucleoproteins


72 Which of these is NOT a monocarboxylic amino acid

Aspartic acid


73 Which of these is a basic amino acid?

Lysine


74 Which of these amino acid contain sulphur?

Methionine


75 Which of these is not an aromatic amino acid

lysine


76 Which of these is an essential amino acid for humans

Tryptophan


77 Amino acids are considered amphoteric for one of the following reasons

They have both basic and acidic properties


78 One of these amino acids is a component of a food flavour enhancer

Glutam ic acid


79 Which of these amino acids is tasteless?

Leucine


80 Which of these amino acids has a bitter taste?

Isoleuc ine




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