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WorksheetsMOLECULE OF LIFE
Total questions: 30
Worksheet time: 15mins
Identify bond X
Polar covalent bond
Non-polar covalent bond
Hydrogen bond
Peptide bond
How many hydrogen bonds one water molecule form with other water molecules?
1
2
3
4
The molecules of water are able to form hydrogen bonds because,
Hydrogen is more electronegative
The water molecules is shaped like tetrahedron
The bond that hold together the atoms in water molecules are polar covalent bonds
The oxygen atom in a water molecules has a week positive charge
Lakes only freeze on the surface because
water has high surface tension
water can act as solvent
water has low viscosity
ice is less dense than water
When swimming in a lake or on a hot summer day , the water is cooler than the air temperature. The water is cool because...
The specific heat of water is less than air
The latent heat of water is more than air
It requires much more energy to change the temperature of the water than it does to change the temperature of the air
It requires less energy to change the temperature of the water than it does to change the temperature of the air
Which properties of water act as a biological lubricant?
Water has low viscosity
Water is a polar molecule
Water has a high surface of tension
Water is a liquid at room temperature
What determine the cohesiveness of the water molecules?
Ionic bond
Hydrogen bond
Hydrophobic interaction
Non polar covalent bond
Identify the sugar molecule above
α-glucose
β-glucose
Fructose
Galactose
Monosachharides are water soluble because
they contain a large number of methyl groups
they have large number of polar hydroxyl groups
they have at least one double bond between adjacent carbons
they have large numbers of nonpolar carbons in their backbones
Which of the following is true about maltose and amylose?
both monomers are ß-glucose
both are polysaccharides
both are disaccharides
both contain monomers α-glucose
Which of the following is TRUE about cellulose?
It is a polymer composed of sucrose monomers
It is a storage polysaccharides to supply energy in plant cell
It is a major structural component of plant cell wall
It is a major structural component of animal cell plasma membranes
Why can human digest starch but not cellulose?
The monomer of starch is glucose while the monomer of cellulose is galactose
Human have the enzyme that can hydrolyze than β - glycosidic linkage of starch but not α - glycosidic linkage of cellulose
Human have an enzyme that can hydrolyze the α - glycosidic linkage of starch but not β - glycosidic linkage of cellulose
Human harbor starch starch- digesting bacteria in the digestive tract
5. Structure of a fatty acid that consists both hydrophobic region and hydrophilic region known as
amphipathic
acidic
basic
amphoteric
Saturated fatty acid
are the predominant between carbon atoms of the fatty acids
have double bonds between carbon atoms of the fatty acids
have a higher ratio of hydrogen to carbon than in unsaturated fatty acids
are usually liquid at room temperature
Which of the following is the characteristics of saturated lipids which differentiate them from unsaturated lipids?
They do not contain glycerol
They contain only unbranched fatty acid
They are composed only of unbranched glycerol
They have no double bonds between their carbon atoms
The phosphate group in phospholipids is....
Polar and hydrophilic
Non- polar and hydrophobic
Ionized in water
Uncharged
Which of the following is not a general features of Lipids?
Store more energy than Carbohydrate
Higher density than water
Insoluble in water but soluble in organic solvent
Compound that consist of Carbon, Hydrogen, Oxygen, Phosphorus and Nitrogen,
How do amino acids are classified into four groups?
based on their amino group
based on their carboxyl group
based on the numbers of carbon
based on their side chain
Property of amino acid that consists an amino group and a carboxyl group known as
acidic
basic
amphoteric
amphipathic
What is the molecule formed when 2 amino acids undergo condensation?
maltose
dipeptide
sucrose
pentose
Which bond is formed during the formation of the primary structure of a protein?
Peptide bond
Hydrogen bond
Disulfide bond
Phosphodiester bond
What maintains the secondary structure of a protein?
Peptide bonds
Hydrogen bonds
Disulfide bonds
Phosphodiester bonds
A protein polymer is known as
Polypeptide
Dipeptide
Amino Acid
Peptide
Which of the following function is the major purpose of the RNA?
Transmit genetics information to offspring
Function in the synthesis of protein
Make a copy of it, thus ensuring genetic continuity
Act as a pattern or blueprint to form DNA
The phosphodiester linkage in DNA or RNA is formed between...
Two bases
Two sugars
Sugar and a base
Sugar and phosphate
Which of the following statements is TRUE to differentiate between DNA and RNA ?
RNA is double stranded while DNA is single stranded
DNA is found in the nucleus while RNA is never found in the nucleus
In DNA, adenine pairs with guanine while in RNA adenine pairs with thymine
DNA contain thymine while RNA contains uracil
Based on the diagram, identify purine.
Adenine
Uracil
Cytosine
Thymine
Why is DNA important?
It's in every cell of living organism
It is very small and complicated
It will cause mutation
It serves as the blueprint for traits of all living things
Identify the bases sequence that will complementary with 5' ATG TGA CAG 3'
3' ATG TGA CAG 5'
5' GTA AGT GAC 3'
3' TAC ACT GTC 5'
5' TAC ACT GTG 3'
If a DNA molecule consists of 29% Guanine, how much Thymine it will contain?
29%
58%
21%
42%
