Grade 11 Unit 2

Question 1

the energy that joins atoms together to form a molecule

Answer 1

bond

Question 2

T number of bonds an atom can make with other atoms

Answer 2

valency

Question 3

……. hold the two strands of a DNA molecule together and help to hold protein molecules in shape

Answer 3

Hydrogen bonds

Question 4

T/F
Nearly all the polysaccharides found in living things are polymers of ketose monosaccharides.

Answer 4

F, aldose

Question 5

…..are molecules with the same chemical composition, but a different arrangement of atoms

Answer 5

isomers

Question 6

…….are a group of atoms within a molecule that behaves in a particular way

Answer 6

functional group

Question 7

……… are so insoluble in water that they make excellent water repellents, for example, in coating birds’ feathers and the epidermis of the leaves of plants (the waxy cuticle).

Answer 7

Waxes

Question 8

……… are one of the basic components of all cell membranes

Answer 8

Phospholipids

Question 9

…….is the functional group of the fatty acid

Answer 9

carboxyl group

Question 10

……..is the bond that forms between a carboxyl group and a hydroxyl group

Answer 10

ester bond

Question 11

….?….. help to prevent cholesterol being laid down in the linings of arteries (atherosclerosis) and so help to prevent heart disease.

Answer 11

Polyunsaturated fatty acids

Question 12

……….. molecules form ion • channels, transport proteins and surface receptors for hormones, neurotransmitters and other molecules

Answer 12

protein

Question 13

…… is wound around • molecules of the protein histone to form a chromosome

Answer 13

DNA

Question 14

amino acids are the building blocks of proteins and have two functional groups …… n ……..

Answer 14

the amino group and the carboxyl group.

Question 15

…….is a linear polymer consisting of amino acid residues bonded together in a chain forming a part or all of a protein molecule

Answer 15

polypeptide

Question 16

Which structure of each protein is coded for by DNA which determines the type and position of each amino acid in the polypeptide chain

Answer 16

primary structure

Question 17

Which protein structure determines where ionic and hydrogen • bonds and disulphide bridges form, so it determines the tertiary structure and shape of the protein molecule.

Answer 17

secondary

Question 18

There are two functional groups in monosaccharides:

Answer 18

Aldose and ketose group

Question 19

…….is the fibrous protein found in many tissues in mammals

Answer 19

Collagen

Question 20

…… is measure of how difficult it is to break surface of liquid

Answer 20

Surface tension

Question 21

T/F
Water dissolves polar n ionic substances

Answer 21

T

Question 22

When glycerol combines with one fatty acid

Answer 22

Monoglyceride

Question 23

When glycerol combines with two fatty acids

Answer 23

Digylceride

Question 24

When glycerol combines with three fatty acids

Answer 24

Triglycerides

Question 25

........ is a 3C alcohol that contains OH groups

Answer 25

Glycerol

Question 26

......... is a long straight chain of carbon atoms with carboxyl group at one end

Answer 26

FA

Question 27

Triglycerides can be classified into

Answer 27

Fats n oils

Question 28

What is biological properties of triglycerides determined by

Answer 28

*length of chain of carbon atoms *degree of saturation

Question 29

Which generally gives better health benefits when present in human diet

Answer 29

Polyunsaturated FA

Question 30

...... is backbone of triglycerides

Answer 30

Glycerol

Question 31

......... is tail of triglycerides

Answer 31

FA

Question 32

Which FA is more energetic because it contains larger number of hydrogen

Answer 32

Saturated FA

Question 33

Lipid used to make sex hormones is

Answer 33

Steroid

Question 34

..... is the leaner sequence of A.A

Answer 34

Primary structure

Question 35

In alpha helical structure the H bonding occurs between ........

Answer 35

Atoms within same polypeptide chain

Question 36

In beta pleated sheet the hydrogen bonding takes place between .....

Answer 36

Between polypeptide chains

Question 37

The primary structure of protein is firmly maintained by which bond

Answer 37

Peptide bond

Question 38

Which protein structure is determined by type n position of each a.a in the polypeptide chain folds

Answer 38

Primary structure

Question 39

Insulin is an example of which protein structure

Answer 39

Primary

Question 40

Hemoglobin is example of which protein structure

Answer 40

Quaternary

Question 41

Nitrogenous base which are double ringed are called ....... n contain which which

Answer 41

Purines. Adenine n guanine

Question 42

Nitrogenous base which is single ringed is called ...... n contains which which

Answer 42

Pyramidines. Thymine, uracil, cytosine

Question 43

The number of thymine equals with ..... in dna

Answer 43

Adenine

Question 44

What's absent in nucleosides that's present in nucleotides

Answer 44

Phosphate group

Question 45

How does dna code for proteins in a cell?

Answer 45

By arranging certain nitrogen bases of cell in particular order

Question 46

Carbohydrates chemistry is determined by their ...... group

Answer 46

Hydroxyl group

Question 47

Glucose differs from galactose in ..........

Answer 47

Position of -OH group on the third carbon

Question 48

The most commonly known groups of fat are

Answer 48

Triglycerides

Question 49

T/F Starch is storage form of fat in plants

Answer 49

F. It's not fat, rather carbohydrate

Question 50

What is amphibatic lipid

Answer 50

Molecule with hydrophilic polar head n hydrophobic nonpolar tail

Question 51

T/F Phospholipids are amphibatic lipids

Answer 51

T