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Biology (class 11) > Biomolecules > Flashcards

Biomolecules Flashcards

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1
Q

Glucose- use

A
  • Hexose sugar (Monosaccharide)

- Oxidation of glucose provides energy to the cell

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2
Q

Ribose- use

A
  • pentose sugar (Monosaccharide)

- synthesis of RNA nucleic acid

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3
Q

Deoxyribose- use

A
  • Pentose sugar (Monosaccharide)

- Synthesis of DNA nucleic acid

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4
Q

Maltose

A
  • Disaccharide
  • Reducing sugar
  • Occurs in plants as a product of starch
  • Melting point is 135 degree celsius
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5
Q

Lactose

A
  • Disaccharide
  • Reducing sugar
  • called milk sugar
  • animal origin, formed as 5% in milk of mammals
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6
Q

Sucrose

A
  • Disaccharide
  • Non-reducing sugar
  • Called table sugar. Principal disaccharide of higher plants.
  • Forms colourless crystals and melting point is 160 degree celsius
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7
Q

Glycogen

A
  • Polysaccharide
  • Reserve carbohydrate seen in animals
  • Stored in liver and muscles
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8
Q

Starch

A
  • Polysaccharide
  • Major fuel store in plants
  • Sugar is converted to starch during photosynthesis
  • Found in cereals, rice and wheat
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9
Q

Cellulose

A
  • Polysaccharide
  • Structural polysaccharide in plants
  • Forms the cell wall in plants
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10
Q

Inulin

A
  • Polysaccharide
  • Muco-polysaccharide seen in plants
  • Polymer of fructose and seen in tubers
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11
Q

Chitin

A
  • Polysaccharide
  • Structural polysaccharide
  • Forms the fungal cell wall and exoskeleton of insects and shells of crustaceans
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12
Q

Fundamental building blocks of proteins

A

The fundamental building blocks of proteins are amino acids.

All proteins that exist in living beings are constructed from 20 amino acids

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13
Q

Primary structure (Proteins)

A
  • It is the number and sequence of amino acids held together by peptide bonds in a polypeptide chain
  • The sequence of amino acids of a protein indicated its biological function
  • It is strictly controlled by the sequence of bases in a DNA.
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14
Q

Secondary Structure (proteins)

A
  • It indicates the shape of the polypeptide chain
  • The bonding of amino acids could lead to pleating or folding of protein chain
  • The two main secondary structures exhibited by proteins are:
    1. Alpha-helical structure. Example- Keratin (seen in nails, hair, claws, wool, feathers etc.)
    2. Pleated structure. Example- Silk fibrion (protein used by silkworm to make their cocoon)
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15
Q

Tertiary structure (proteins)

A
  • Super-folding of proteins yield intricate spheres and globules
  • E.g. Myoglobin- acts as catalytic and carrier molecules
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16
Q

Quaternary structure (proteins)

A

Aggregate of multiple polypeptides to form a single functional protein

E.g. enzymes and haemoglobin

17
Q

Functions of proteins

A
  • Repair and maintenance of body, carries out transportation and storage of molecules
  • Major source of energy
  • Act as enzymes, antibodies and creates hormones
18
Q

Essential amino acids

A
  • They are not biosynthesized in the body
  • They have to be included in the diet

Examples- the 9 essential amino acids are- Valine, Leucine, Isoleucine, Threonine, Tryptophan, Lysine, Methionine, Phenylalanine, and Histidine.
(PVT TIM HaLL)

Adults need to obtain only 8 of them. The 9th amino acid- Histidine is only essential for infants

19
Q

Non-essential amino acids

A
  • They are biosynthesized in the body
  • May be included in the diet also

Examples- the 11 non-essential amino acids are ‘Almost Always All Girls Go Crazy After Getting Taken Prom Shopping’ which stands for Alanine, Asparagine, Arginine, Glutamate, Glutamine, Cysteine, Aspartate, Glycine, Tyrosine, Proline and Serine.

20
Q

Lipids

A
  • Lipids (triglycerides) have a glycerol molecule (head) and three fatty acids (tail)
  • Seen in butter, vegetable oil, avocado etc.
  • The enzyme lipases help in breaking down these fatty acids and energy is released
21
Q

Fats

A
  • Simple lipids
  • Esters of fatty acid with glycerol
  • Solid at room temperature
22
Q

Oils

A
  • Simple lipids
  • Esters of fatty acid with glycerol
  • Liquid at room temperature
23
Q

Waxes

A
  • Simple lipids
  • Esters of fatty acids other than glycerol
  • Solid at room temperature
24
Q

Phospholipids

A
  • Compound lipids
  • Lipids with fatty acids, glycerol, A PHOSPHORIC ACID, nitrogen bases and certan substitutes like lecithin, cephalins etc
25
Q

Glycolipids

A
  • Compound lipids
  • Lipids with fatty acids, glycerol, carbohydrates, nitrogen bases and substitutes like gangliosides etc.
26
Q

Steroids

A
  • Derived lipids
  • Cholesterol is the principal sterol seen in animal tissues (nerve tissues).
  • It is a precursor of bile salts, Vitamin D3 (write 3 as subscript), and hormones like testosterone and progesterone
27
Q

Carotenoids

A
  • Derived lipids
  • It is exclusively of plant origin
  • Due to the presence of conjugated double bonds, they are coloured red or yellow
28
Q

Functions of lipids

A
  • Lipids are very rich in calorific value
  • Fats are stored as reserve food material in adipose tissues and creates heat insulation
  • Lipids are structural components of membranes
  • Some lipids like cholesterol maintains the fluidity of the cell membrane and also helps in the synthesis of hormones and vitamins
29
Q

What are enzymes?

A

Enzymes:
1. act as biological catalysts.
2. accelerate the rate of a reaction but do not themselves undergo any change.
3. are active in very small quantities
4. are very specific in nature

30
Q

Simple proteins

A

Proteins with only amino acids

31
Q

Conjugated proteins

A

Proteins with attached non-protein groups/co-factor

  1. Apoenzyme (protein only)
  2. Holoenzyme (protein + co-factor)
    Co- factor:
    Inorganic- metal ion
    Organic- Prosthetic group/co-enzyme
32
Q

Oxidoreductases

A

Reaction catalysed: Transfer of hydrogen and oxygen atoms or electrons from one substrate to another

Examples: Dehydrogenases, Oxidases

33
Q

Transferases

A

Reaction catalysed: Transfer of a specific group (a phosphate or methyl etc.) from one substrate to another

Examples: Transaminase, Kinases

34
Q

Hydrolases

A

Reaction catalysed: Hydrolysis of a substrate

Examples: Estrases, Digestive enzymes

35
Q

Isomerases

A

Reaction catalysed: Change of the molecular form of the substrate

Example: Phospho hexo isomerase, Fumarase

36
Q

Lyases

A

Reaction catalysed: Nonhydrolytic removal of a group or addition of a group to a substrate

Example: Decarboxylases, Aldolases

37
Q

Ligases (Synthetases)

A

Reaction catalysed: Joining of two molecules by the formation of new bonds

Examples: Citric acid synthetase

38
Q

Factors affecting enzyme activity

A
  • Temperature (30 degrees celsius to 50 degrees celsius)
  • Substrate concentration
  • pH (4 to 9)
  • Competitive inhibitors
39
Q

Competitive inhibition

A

The inhibitor molecule is structurally similar to the substrate and blocks the active site of the enzyme, thus inhibiting the formation of E + S complex.

Biology (class 11) (14 decks)

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