Download IB Biology HL1 Fall MC questions Water / Characteristics of life

IB Biology HL1 Fall MC questions
Water / Characteristics of life / Statistics
1.
Which of the following reactions occurs when a dipeptide is formed from amino acids?
A.
Hydrolysis
B.
Denaturation
C.
Condensation
D.
Oxidation
2.
The three most common elements in the macromolecules are:
A.
Carbon, hydrogen and sodium
B.
Iron, hydrogen and oxygen
C.
Carbon, nitrogen and oxygen
D.
Carbon, hydrogen and oxygen
3.
What causes water to have a relatively high boiling point?
A.
Hydrogen bonds between water molecules
B.
Hydrogen bonds between hydrogen and oxygen within water molecules
C.
Cohesion between water molecules and the container in which the water is boiled
D.
Covalent bonds between hydrogen and oxygen within water molecules
4.
The data shows the number of flowers per flower head of a random sample from a white clover
(Trifolium repens) population.
36
51
56
62
62
63
65
69
73
83
Mean = 62
Standard deviation = 12.5
What statistical percentage of the population has between 49 and 75 flowers per flower head?
A.
5%
B.
32 %
C.
68 %
D.
95 %
Macromolecules
5.
Which is not a primary function of protein molecules?
A.
Hormones
B.
Energy storage
C.
Transport
D.
Structure
6.
Which of the following are connected by a hydrogen bond?
A.
The hydrogen and oxygen atoms of a water molecule
B.
A base pair of a DNA molecule
C.
Two amino acid molecules of a dipeptide
D.
Two glucose molecules in a disaccharide
1
7.
Which molecule represents ribose? D
A.
H
C
O
H
C
H
OH H
C
OH C
H
C.
O
H
HC
OH
H
O
H
N
H
OH
OH
C
C
OH
C
H 2C
H 2C
8.
B.
CH 2 OH
D.
H
O
HOH 2 C
H
C
C
H
OH
H
H
C
C
OH
OH
OH
Which structure represents an amino acid?D
A.
N
H
C.
C
O
N
C
N
H
H
D.
H
O
C
SH
H
N
H
C
O
OH
H
C
OH
H
H
C
H
H
H
B.
H
H
H
C
H
O
C
OH
9.
Sucrose and maltose are examples of
A. Monosaccharides
B. Disaccharides
C. Polysaccharides
D. Inorganic molecules
10.
An example of a structural protein in the human body is:
A.
Hemoglobin
B.
Amylase
C.
Cellulose
D.
Collagen
11.
Which of the four levels of organization in proteins may involve a non-protein molecule?
A.
Primary structure
B.
Secondary structure
C.
Tertiary structure
D.
Quaternary structure
12.
Which of the following bonds create tertiary structure in proteins?
I.
Covalent
II.
Hydrogen
III.
Ionic
A.
I only
B.
I and II only
C.
I, II and III
D.
II and III only
2
13.
Which of the following terms correctly describe the molecule below?
H
OH
H
C
H
C
OH
14.
C
O
H
OH
H
C
C
H
OH
H
C
OH
I.
Monosaccharide
II.
Ribose
III.
Carbohydrate
A.
I only
B.
I and III only
C.
II and III only
D.
I, II and III
What are the components of a DNA nucleotide?
A.
Deoxyribose, a phosphate and one of the bases: adenine, cytosine, guanine or
thymine
B.
Ribose, a phosphate and one of the bases: adenine, cytosine, guanine or uracil
C.
Deoxyribose, a nitrate and one of the bases: adenine, cytosine, guanine or thymine
D.
Ribose, a nitrate and one of the bases: adenine, cytosine, guanine or thymine
15.
What is the maximum number of fatty acids that can be condensed with glycerol?
A.
One
B.
Two
C.
Three
D.
Four
16.
Which of the following features are correct for hydrogen bonding?
I.
It is involved in the cohesion of water.
II.
It results in the thermal properties of water.
III.
It is a bond within the water molecule.
A.
I and II only
B.
II and III only
C.
I and III only
D.
I, II and III
3
17.
18.
What is a role of carbohydrates in animal cells?
A.
As channels for passive transport
B.
As enzymes
C.
As energy storage
D.
As components of the animal cell wall
What is the composition of the backbone of DNA?
A.
Alternating sugar and phosphate molecules
B.
Complementary base pairs
C.
Alternating sugar and base molecules
D.
A polysaccharide
Enzymes
19.
Consider the metabolic pathway shown below.
1
2
A
B
C
3
D
4
E
If there is end-product inhibition, which product (B to E) would inhibit which enzyme (1 to 4)?
Product
C
B
B
E
A.
B.
C.
D.
20.
Enzyme
4
3
4
1
According to the induced fit model of enzyme function, which of the following statements is
correct?
21.
A.
Active sites on enzymes are specific to a single substrate.
B.
The shape of the active site can be changed by the binding of an allosteric inhibitor.
C.
The binding of the substrate changes the shape of the active site slightly.
D.
Competitive inhibitors can change the shape of enzymes
What is an active site?
A.
The part of an enzyme that binds only to the product molecules.
B.
The sequence of amino acids responsible for the catalytic activity of enzymes.
C.
The sequence of amino acids responsible for the structure of an enzyme.
D.
The specific area responsible for the activity of all proteins.
4
22.
The graph below shows the effect of changing the substrate concentration on an enzyme
controlled reaction.
40 % substrate
20 % substrate
10 % substrate
Amount of product formed
5 % substrate
2.5 % substrate
0 % substrate
Time
What is the correct interpretation of these data?
A.
B.
C.
D.
The rate of reaction increases continuously with increase in substrate concentration.
The rate of reaction decreases continuously with increase in substrate concentration.
The rate of reaction increases up to a point and then remains constant.
The rate of reaction is not affected by any change in the substrate concentration.
23.
The region of an enzyme molecule that combines with the substrate is the
A.
Allosteric site
B.
Reactant
C.
Active site
D.
Coenzyme
24.
Which of the following could cause denaturation of an enzyme?
A.
Substrate concentration
B.
A competitive inhibitor
C.
High temperature
D.
Low salt concentration
25.
Which statement describes how allosteric enzymes work?
Competitive
inhibition
Reversible
End-product
inhibition
Active and
inactive forms
A.
B.
C.
D.
Key:
= yes
= no
5
26.
The reaction below shows the energy changes in a chemical reaction.
What would happen to the changes in energy if this reaction was controlled by an enzyme?
A.
I would increase.
B.
II would decrease.
C.
I and IV would decrease.
D.
II and III would decrease.
DNA Replication/Protein Synthesis
27. Where do transcription and translation occur in eukaryotic cells?
A.
B.
C.
D.
Transcription
Cytoplasm
Cytoplasm
Nucleus
Nucleus
Translation
Cytoplasm
Mitochondria
Cytoplasm
Nucleus
28.
A biochemist isolated and purified molecules needed for DNA replication. When some DNA
was added replication occurred, but the DNA molecules formed were defective. Each consisted
of a normal DNA strand paired with segments of DNA a few hundred nucleotides long. Which
of the following had been left out of the mixture?
A.
DNA ligase
B.
Helicase
C.
Nucleotides
D.
DNA polymerase
29.
What is removed to form mature eukaryotic mRNA?
A.
RNA primers
B.
Exons
C.
RNA polymerases
D.
Introns
30.
A certain gene codes for a polypeptide that is 120 amino acids long. Approximately how many
nucleotides long is the mRNA that codes for this polypeptide likely to be?
A.
30
B.
40
C.
360
D.
480
6
31.
To which parts of the deoxyribose molecule do phosphates bind in DNA?
V
CH2 OH
I
O
H
IV
H
H
H
OH
II
OH
H
III
A.
I and V
B.
III and IV
C.
II and III
D.
III and V
32. Initiation, elongation and termination are the main stages in:
A. Transcription
B. Translation
C. Replication
D. Decomposition
33. The statement “DNA replicates by a semiconservative mechanism” means that
A. Only one DNA strand is copied
B. First one DNA strand is copied, and then the other strand is copied
C. The two strands of a double helix have identical base sequences
D. Each double helix consists of one old and one newly synthesized strand
34.
35
36
If mRNA has a codon CAU, what is the corresponding anticodon on the tRNA molecule?
A.
CAT
B.
GUA
C.
CAU
D.
GTA
What enzyme is used in transcription but not in translation?
A.
DNA polymerase
B.
Helicase
C.
Protease
D.
RNA polymerase
During the process of translation which of the following statements describes the relationship
between nucleic acids?
A.
Anticodons on mRNA bind to complementary codons on DNA.
B.
Anticodons on tRNA bind to complementary codons on mRNA.
C.
Bases on DNA bind to complementary bases on mRNA.
D.
A single strand of mRNA is produced from the DNA in the nucleus.
7
37.
38.
What is the function of DNA polymerase I?
A.
To add appropriate nucleotides in the 3′  5′ direction
B.
To remove the RNA primers and replace them with DNA
C.
To join together the Okazaki fragments
D.
To join together both strands of DNA to the histones
The drawing below shows a short section of a DNA molecule. What is labelled by I, II and III?
I
II
III
39.
I
II
III
A.
3′ end
purine
hydrogen bond
B.
5′ end
pyrimidine
covalent bond
C.
3′ end
pyrimidine
hydrogen bond
D.
5′ end
purine
covalent bond
What is responsible for the conservation of the base sequence during DNA replication?
A.
DNA polymerase working on one strand at the same time.
B.
Unpaired bases always attracting their complementary nucleotides.
C.
DNA helicase and polymerase are complementary.
D.
Both strands are identical to each other.
Cells
40. Which organelles have a transport function?
41.
A.
Ribosome and Golgi apparatus
B.
Golgi apparatus and endoplasmic reticulum
C.
Mitochondrion and endoplasmic reticulum
D.
Mitochondrion and ribosome
In an electron micrograph, a DNA molecule appears 1 mm wide. The magnification of the
micrograph is 500 000. What is the width of the DNA molecule?
A.
0.5 nm
B.
2 nm
C.
0.5 m
D.
2 m
8
42.
What describes the functions of the following organelles?
Golgi apparatus
43.
44.
Rough endoplasmatic
reticulum
A.
Synthesis of proteins for cell
secretion
ATP production
B.
ATP production
Synthesis of proteins for cell
secretion
C.
Synthesis of proteins for cell
secretion
Processing of proteins
D.
Processing of proteins
Synthesis of proteins for cell
secretion
Which of the following structures are present in both plant and animal cells?
I.
Cell wall
II.
Chloroplast
III.
Mitochondrion
A.
I only
B.
I and II only
C.
I and III only
D.
III only
The diagram below represents an animal cell.
Which processes occur in the locations labeled?
Transcription
Translation
Respiration
A.
II
III
I
B.
III
II
I
C.
II
III
IV
D.
III
II
IV
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