biomolecules 2

Biomolecules

Multiple Choice

What are the end products of Starch Hydrolysis?

• Phenylpyruvic acid, ammonia and water

• Iodine and water

• Disaccharides and monosaccharides

• Ammonia and nitrate gas

Multiple Choice

What enzyme catalyzes Starch Hydrolysis?

• Amylase

• Phenylalanine deaminase

• Nitrate reductase

• Nitrite reductase

Multiple Choice

On oxidation with a mild oxidising agent like Br₂/H₂0, the glucose is oxidized to

• saccharic acid

• glucaric acid

• gluconic acid

• valeric acid

Multiple Choice

Glycosidic linkage is an

• amide linkage

• ester linkage

• ether linkage

• acetyl linkage

Multiple Choice

The letter ‘D’ in carbohydrates signifies

• dextrorotatory

• configuration

• diamagnetic nature

• mode of synthesis

Multiple Choice

Maltose is made up of

• two α-D-glucose

• normal β-D-glucose

• α- and β-D-glucose

• fructose

Multiple Choice

Which of the following treatment will convert starch directly into glucose?

• Heating with dilute H₂SO₄

• Fermentation by diastase

• Fermentation by zymase

• Heating with dilute NaOH

​Proteins

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​Acidic amino acids

Basic amino acids

Multiple Choice

If a methyl group (-CH₃), which does not like water, were at the 'R', the amino acid would likely be:

• Hydrophobic

• Hydrophilic

• Ionic

• Acidic

Multiple Choice

Amino acids all have the same general structure except for the:

• Amino Group
• Carboxyl Group
• 'R' Group
• Carbonyl Group

Multiple Choice

The amino acid that results in disulphide bridges is:

• Cysteine
• Alanine
• Glutamic Acid
• Valine

Multiple Choice

The amino acid isomer that is used to produce the proteins of all living things is the 

• L-Isomer
• D-Isomer
• α-Isomer
• β-Isomer

Multiple Select

All hydrophobic aminoacids (valine, leucine, isoleucine etc) share which of the following properties?

• polar uncharged R-groups

• non-polar uncharged R-groups

Multiple Choice

When R is H, then amino acid is....................

• Serine

• Glycine

• Alanine

• Lysine

Multiple Choice

Which of the following amino acids is essential amino acid

• Asparagine

• Threonine

• Serine

• Cysteine

Multiple Choice

The amino acids, which can be synthesised in the body, are known as ................

• essential amino acids

• non- essential amino acids

Multiple Choice

Except glycine, all other naturally occurring α-amino acids are optically ..............., since the α-carbon atom is ...........................

• active, symmetric

• inactive, symmetric

• active, asymmetric

• inactive, asymmetric

Multiple Choice

Amino acids are usually ..........................solids.

• crystalline

• amorphous

Multiple Choice

Amino acids are ................

• water soluble

• water insoluble

• sparingly soluble in water

Multiple Choice

In zwitter ionic form, amino acids show ..............................behaviour

• acidic

• basic

• amphoteric

Multiple Choice

proteins are the polymers of α-amino acids and they are connected to each other by ........................

• glycosidic bond

• covalent bond

• dative bond

• peptide bond

Multiple Choice

Chemically, peptide linkage is an ........................formed between –COOH group and –NH2 group

• amine

• ether

• amide

• ester

Multiple Choice

If a third amino acid combines to a ..........................., the product is called a .....................

• dipeptide, tripeptide

• dipeptide, dipeptide

• tripeptide, tripeptide

• tripeptide, dipeptide

Multiple Choice

The primary sequence of a protein refers to the:

• Order of amino acids
• α-Helix or β-Pleated Sheet
• Interaction of subunits
• Hydrogen Bonding

Multiple Choice

Structures like an α-Helix are formed because of:

• Hydrophobic Interactions
• DiSulphide Bridges
• Salt Bridges
• Hydrogen Bonding

Multiple Choice

The structure of proteins can be changed by environmental factors such as temperature or pH.

• True
• False

Multiple Choice

The sequence of amino acids is determined by:

• Genes
• Hydrogen Bonds
• Like Dissolves Like
• pH

Multiple Choice

Are these statements about amino acids true or false?

Peptide links can undergo hydrolysis by reflux with hydrochloric acid

• true

• false

Multiple Choice

Why are many enzymes soluble in water?

• They contain large numbers of hydrogen bonds

• They contain many amino acids with hydrophilic side chains

• they contain an active site

Multiple Choice

Which one is an acidic amino acid?

Multiple Choice

The name of the initial chain of monomers in a protein is called.....

• polypeptide
• polysaccharide
• polyester
• polynucleotide

Multiple Choice

Why is folding so important in proteins?

• It gives them a unique, 3-D functional shape

• It makes them look tidier

• It makes every protein molecule different from the next even if they are the same type

• The folding is random so is not that important at all

Multiple Choice

The main bonding in the secondary structure of a protein is due to.....

• covalent bonding

• ionic bonding

• hydrogen bonding

• polar bonding

Multiple Choice

Shape is essential for a protein to be functional?

Multiple Select

Which of the following give a protein its unique 3-D shape? (3)

• the unique sequence of amino acids in the primary structure

• hydrogen bonding to form alpha-helixes and beta-pleated sheets in the secondary structure.

• unique interactions between the 'R' groups in the tertiary structure

• random folding due to temperature and extreme pH throughout the folding process

• unique sequence of monosaccharides in the quaternary structure