WorksheetsIB Biology Topic 2.1-2.6
Total questions: 60
Worksheet time: 54mins
What is the maximum number of bonds a carbon atom can form with another atoms?
3
2
4
6
Which chemical group do amino acids contain that carbs and lipids do not?
hydroxyl
amine
carboxyl
methyl
Which term describes the synthesis of complex molecules fromsimpler molecules?
adhesion
catabolism
metabolism
anabolism
At room temperature, water is a liquid and methane is a gas. Which molecular property explains this difference?
Higher molecular mass of water
Dipolarity of water
Presence of more hydrogen in methane
Higher boiling point than methan
A polymer of alpha-D-glucose found in plants has mostly 1,4 linkages and some 1,6 linkages. Which molecule fits this description?
Glycogen
Cellulose
Amylose
Amylopectic
Which molecule is a polysaccharide?
Glucagon
Glucose
Glycerol
Glycogen
Which type of reaction is the breakdown of starch into sugars?
Denaturation
Reducation
Catabolic
Condensation
What property of water makes it suitable as a coolant?
It takes a lot of energy to increase the temperature of water.
It takes a lot of energy for water to evaporate.
Water molecules are cohesive and stick to the skin.
Water is a good solvent so it can transport heat from the body.
Which type of chemical reaction is an example of anabolism?
Phytolysis
Combustion
Hydrolysis
Condensation
What feature of carbon makes it most suitable as a basis for life?
Its abundance in nature
Its bonding properties
Its teativity to light
Its presence in the early atmosphere of the Earth
Which statement is true about amino acids?
All amino acids have
C=C double bondsAll amino acids have amine groups.
Some amino acids contain phosphorus.
No amino acid contains sulfur.
When water molecules are near each other, what forms between them?
nothing
a tiny rope
Attractive forces
Hydrogen Bonds
Hydrophillic means
water-loving
water-fearing
Which property of water would allow bugs to float on water?
Cohesion
Adhesion
Thermal
Solvent
The energy required to increase 1g of a substance 1 degree Celcius is
Boiling
Increase in energy
Freezing
Specific Heat
Carbohydrates contain the following elements:
Carbon, Hydrogen, Oxygen
Carbon, Hydrogen, Nitrogen
Carbon, Hydrogen, Phosphorous
Carbon, Oxygen, Nitrogen
Lipids contain the following elements:
Carbon, Oxygen, Sulfur
Oxygen, Carbon, Nitrogen
Carbon, Oxygen, Hydrogen
Carbon, Nitrogen, Sulfur
The monomers that make up polypeptides are called:
amino acids
fatty acids
nucleotides
monosaccharides
Another name for a polypeptide is:
lipid
carbohydrates
protein
nucleic acid
Which macromolecule is shown?
lipid
protein
nucleic acid
carbohydrate
Which macromolecule is shown?
lipid
protein
nucleic acid
carbohydrate
Which is shown in the picture?
Fatty Acid
Monsaccharide
Amino Acid
Nucleotide
Starch is a mixture of which two polysaccharides?
Amylose & Amylopectin
Amylopectin & Cellulose
Amylose & Cellulose
Cellulose & Cellulite
Which monomers are in lactose?
glucose
galactose
fructose
ribose
deoxyribose
Which is correct?
A
B
C
D
Which one shows a secondary structure of protein?
Which one shows a primary structure of protein?
What is collagen’s function?
Enzymes in secretions such as nasal mucus and tears; it kills some bacteria by digesting the peptidoglycan in their cell walls.
Membrane protein used to make connections between structures inside and outside a cell.
Structural protein in tendons, ligaments, skin and blood vessel walls; it provides high tensile strength, with limited stretching.
Transport protein in red blood cells; it binds oxygen in the lungs and releases it in tissues with a reduced oxygen concentration.
Which one shows a tertiary structure of protein?
A proteome is as unique to a person as their genome is.
True
False
Which one of the following is one of the functions/roles a protein serves in a cell? (check all that apply)
Immunity
Hormones
Sensation
Transport
Which one shows a quaternary protein structure?
Which parts of the amino acid react with another amino acid to form a peptide bond?
The carboxyl group and the amino group
The amine group and the R group
The R group and carbon backbone
The carboxyl group and the R group
In an enzyme-catalyzed reaction, the _____ binds to the _____ .
Substance, enzyme
Substrate, enzyme
Substrate, active site
Substrate, allosteric site
An increase in which of these factors will guarantee an increase in enzyme activity?
Temperature
pH
Substrate concentration
Amount of enzyme present
This graph represents enzyme activity with relation to which factor?
Temperature
pH
Substrate concentration
This graph represents enzyme activity with relation to which factor?
Temperature
pH
Substrate concentration
Catalase is an enzyme produced in the liver. It decomposes hydrogen peroxide into water and oxygen gas. Where would you expect its optimum temperature to be?
0°C
40°C
100°C
It has no optimum temperature since the higher the temperature, the more collisions.
Three flasks were prepared for an analysis of the activity of amylase. At time zero, each of the substances indicated in the diagrams was added.
Which flask(s) could provide support for the hypothesis that heat denatures enzymes?
A. Flasks I and II after 15 minutes
B. Flasks II and III after 15 minutes
C. Flasks I and III after 15 minutes
D. Flask III at time zero and again after 15 minutes
The graph shows the effect of increasing the substrate concentration on the rate of an enzyme-catalysed reaction. What is occurring during the phase indicated by section Y of the graph?
A. The active site of the enzyme is saturated
B. The enzyme becomes denatured
C. The substrate concentration has risen too high
D. The optimum rate is reached
How can the activity of a human amylase enzyme be increased during a laboratory experiment?
A. Adding sugar to the mixture
B. Decreasing the pH from 7 to 3 C.
C. Increasing the temperature from 20 °C to 37 °C
D. Adding water to the mixture
Which variable has the least effect on enzyme activity?
A. Temperature
B. Light intensity
C. pH
D. Substrate concentration
What are the type of reaction and the product(s) shown in this reaction?
A. Reaction: Condensation, Product(s): two nucleotides
B. Reaction: condensation, Product(s): one dinucleotide
C. Reaction: Hydrolysis, Product(s): two nucleotides
D. Reaction: Hydrolysis, Product(s): one dinucleotide
A.
B.
C.
D.
The hydrolysis of a pure sample of an organic molecule produces a pentose sugar, thymine, guanine and cytosine. What other substances could be expected to be present in the hydrolysed sample?
A. RNA
B. Uracil
C. Phosphate
D. ATP
For which discovery about DNA do Watson and Crick receive credit?
A. DNA is the molecule that genes are made of.
B. The amount of adenine equals the amount of thymine in an organism
C. Phosphate–pentose bonding along the nucleotide backbone is covalent.
D. The shape of DNA is a double helix.
What is a similarity between DNA and RNA?
A. Both are polymers of nucleotides.
B. Both are composed of antiparallel strands
C. Both contain adenine, cytosine and thymine.
D. Both contain ribose sugar
The image shows a DNA nucleotide.
Which correctly identifies the parts labelled I and II?
A. Base (I), Phosphate (II)
B. Ribose (I), Uracil (II)
C. Deoxyribose (I), Base (II)
D. Ribose (I), Adenine (II)
A.
B.
C.
D.
The percentage of thymine in the DNA of an organism is approximately 30 %. What is the percentage of guanine?
A. 70 %
B. 30 %
C. 40 %
D. 20 %
This question refers to the following diagram of DNA.
What does the structure labelled Y represent?
A. Ribose
B. Thymine
C. Guanine
D. Deoxyribose
What are monomers of nucleic acids?
Nitrogenous bases
DNA
Nucleotides
Nucleus
Purine bases include:
C, T
A, G
C, G
A, C
C, T, U
Which feature is common to both mRNA and DNA?
A. Covalent bonds between adjacent nucleotides
B. Hydrogen bonds between guanine and cytosine
C. Ribose sugar attached to phosphate
D. Antiparallel arrangement of polynucleotide strands
What is a similarity between DNA and RNA?
A. Both are polymers of nucleotides.
B. Both are composed of antiparallel strands
C. Both contain adenine, cytosine and thymine.
D. Both contain ribose sugar
The following diagram shows a short stretch of DNA. What bases are indicated by labels Y and Z?
A. Thymine (Y), Uracil (Z)
B. Thymine (Y), Guanine (Z)
C. Uracil (Y), Guanine (Z)
D. Uracil (Y), Adenine (Z)
A.
B.
C.
D.
