Font size
WorksheetsSTEM 100 - Biology Prefinal Exam
Total questions: 50
Worksheet time: 45mins
_____________ is a monosaccharide.
_____________ is a chemical formula of glucose
_____________Combines with fatty acids to form phospholipids.
_____________ used as a energy currency of the cell.
____________ formula for carboxyl functional group
Heads of a phospholipids ______________
_____________consists of a Deoxyribose sugar, phosphate and nitrogenous base
_____________ one of the four biomolecule that used as the main source of energy.
Which property of carbon makes it essential for life?
Its high electronegativity
Its ability to form ionic bonds
Its capacity to form four covalent bonds
Its ability to act as an electron donor
Which element is most commonly bonded to carbon in biological molecules?
Sodium
Hydrogen
Calcium
Magnesium
What is a hydrocarbon?
A molecule containing only carbon and hydrogen
A molecule with oxygen and carbon atoms
A molecule with nitrogen and hydrogen atoms
A molecule that is hydrophobic and polar
How is a polymer formed from multiple monomers?
Through hydrogen bonding
From a growth of chain of carbon atoms
By hydrolysis reaction.
By dehydration reaction
Which functional group is NOT present in this molecule?
Amino
Carboxyl
Hydroxyl
Sulfhydryl
Among the functional groups present in the figure in No. 13, what is the formula for carboxyl functional group?
-COOH
-CO
-NH2
-OH
Which functional group is characteristic of alcohols?
-COOH
-CO
-NH2
-OH
Which of the following functional groups is acidic?
Carbonyl (-C=O)
Carboxyl (-COOH)
Methyl (-CH3)
Hydroxyl (-OH)
Which functional group contains phosphorus and is involved in energy transfer?
Carboxyl group (-COOH)
Amino group (-NH2)
Phosphate group (-PO4)
Hydroxyl group (-OH)
What is the term used for the describing molecules that is mirror image with each other?
Cis-trans isomers
Enantiomers Chiral molecules
Structural isomers
Choose the term that correctly describes the relationship between these two sugar molecules?
Cis-trans isomers
Geometric isomers
Enantiomers
Structural isomers
D-glucose and L-glucose are chiral molecules examples of:
Cis-trans isomers
Geometric isomers
Enantiomers
Structural isomers
Why are isomers important in biology?
They are irrelevant in biological systems
They have identical functions in all biological pathways
They can have dramatically different biological activities
They always degrade rapidly in cells
Refer to the picture below, which of among the three types of molecules exhibit structural isomerism?
Glucose and Galactose
Glucose and Fructose
None of the above
All of the above
Why are carbohydrates important molecules for energy storage?
The C-H bond found in carbohydrates store energy
The double bonds between carbon and oxygen are very strong.
They can form ring structures in the aqueous environment of the cell
The electronegativity of the oxygen atoms means that a carbohydrate is made up of many polar bonds
What is the basic building block (monomer) of carbohydrates?
amino acids
nucleotides
monosaccharides
fatty acids
Which of the following is a monosaccharide?
Sucrose
Fructose
Lactose
Starch
How are disaccharides formed?
By hydrolysis
By addition of water molecules
By removal of water molecules
By breaking down polysaccharides
Which bond forms between monosaccharides in disaccharides?
Hydrogen bond
Glycosidic bond
Peptide bond
Ester bond
Plant cells store energy in the form of __________, and animal cells store energy in the form of ________.
Fructose; Glucose
Disaccharides; Monosaccharides
Cellulose; Chitin
Starch; Glycogen
The molecular formula of glucose is C6H12O6. What would be the molecular formula for a polymer made by linking ten glucose molecules together in by dehydration reactions? Consider: (CH2O)n
C60H120O60
C60H102O51
C60H100O50
C60H111O51
What is the primary function of carbohydrates in living organisms?
Catalyzing reactions
Energy storage and supply
Providing insulation
Transmitting genetic information
Which polysaccharide is used for energy storage in animals?
Starch
Maltose
Cellulose
Glycogen
Oligosaccharides attached on the surface of cell membrane functions as _____.
Energy storage
Structural support
Cell recognition and signaling
Insulation
What is the main carbohydrate component of the cell wall of plants?
Chitin
Starch
Cellulose
Glycogen
What are the two monosaccharides in sucrose?
Glucose and fructose
Glucose and galactose
Glucose and glucose
Fructose and galactose
Which carbohydrate is found in milk?
Sucrose
Maltose
Lactose
Cellulose
Which reaction breaks down polysaccharides into monosaccharides?
Condensation
Hydrolysis
Oxidation
Hydrogenation
Which disaccharide is commonly known as table sugar?
Sucrose
Maltose
Lactose
Galactose
What kind of reaction occurs during the formation of a glycosidic bond?
Oxidation
Condensation
Reduction
Hydrolysis
What is the main source of fructose in the human diet?
Dairy products
Fruits
Vegetables
Starches
Which carbohydrate is most abundant on Earth?
Glycogen
Starch
Cellulose
Fructose
Which among primary carbohydrate derived from fruits and honey?
Fructose
Cellulose
Glucose
Galactose
Reaction of galactose and glucose leads to the formation of which disaccharide?
Maltose
Sucrose
Lactose
Starch
Reaction of four (4) glucose molecules will lead to the formation of ____________.
Starch
Polysaccharide
Oligosaccharide
Glycogen
Which carbohydrate is found in the shells of crustaceans?
Chitin
Starch
Cellulose
Glycogen
What is the primary storage form of carbohydrate in seeds?
Starch
Glycogen
Cellulose
Chitin
How many water molecules are released when 8 monosaccharides join to form a polysaccharide?
5
6
7
8
A polysaccharide was hydrolyzed, yielding 10 water molecules. How many monosaccharides were in the original polysaccharide?
10
11
12
13
Which carbohydrate serves as the primary immediate source of blood sugar in humans?
Fructose
Sucrose
Glucose
Galactose
If a person consumes 50 grams of glucose (4 kcal/gram), how much energy is produced?
200 kcal
150 kcal
50 kcal
400 kcal
Athletes often consume glucose-based energy drinks before a competition. Why is glucose preferred for quick energy?
It is easily stored in the liver.
It is rapidly metabolized to provide ATP.
It forms long-lasting energy reserves.
It reduces lactic acid production.
