Download Biochemistry Name: Questions Thompson

Biochemistry
Name: ______________________________Practice Questions
1. Carbohydrate molecules A and B come in contact with the cell membrane of the same cell.
Molecule A passes through the membrane
readily, but molecule B does not. It is most likely that
molecule A is
A)
B)
C)
D)
a protein, and B is a lipid
a polysaccharide, and B is a monosaccharide
an amino acid, and B is a monosaccharide
a monosaccharide, and B is a polysaccharide
2. If a specific carbohydrate molecule contains ten
hydrogen atoms, that same molecule would most
probably contain
A)
B)
C)
D)
one nitrogen atom
ten nitrogen atoms
five oxygen atoms
twenty oxygen atoms
7. Base your answer to the following question on the types
of molecules in the list below and on your knowledge of
biology.
Types of Molecules
(A) Amino acid
(B) Fatty acid
(C) Monosaccharide
(D) Glycerol
Which types of molecules are used for the synthesis of a
lipid?
A) A and B
C) A and C
B) B and D
D) C and D
8. Base your answer to the following question on the
chemical reaction represented below and on your
knowledge of biology.
3. An inorganic molecule required by green plants for the
process of photosynthesis is
A) oxygen
C) carbon dioxide
B) starch
D) glucose
4. In which type of molecule is the ratio of hydrogen to
oxygen usually 2 to 1?
A) lipid
C) carbohydrate
B) protein
D) glycerol
The molecule represented by structural formula A is
classified as an organic molecule because it contains
A)
B)
C)
D)
hydrogen and carbon atoms
a double covalent bond
nitrogen and hydrogen atoms
a variable functional group
5. Which chemical formula represents a carbohydrate?
A) CH 4
C) Cl2H22O11
B) C3H7O2N
D) CO 2
6. Which substances dissolved in the cytoplasm of an
ameba enable it to carry on life-sustaining activities?
A)
B)
C)
D)
inorganic compounds, only
organic compounds, only
both inorganic and organic compounds
neither inorganic nor organic compounds
Thompson
Biochemistry
Base your answers to questions 9 through 11 on the
diagram below and on your knowledge of biology. The
diagram represents molecules involved in protein
synthesis.
9. The building blocks of molecule 3 are known as
A) amino acids
C) fatty acids
B) DNA molecules
D) RNA molecules
10. Where do the chemical reactions that are coded for by
molecule 2 take place?
A)
B)
C)
D)
14. Some structural formulas of organic molecules are
shown below.
Which structural formulas represent carbohydrate
molecules?
A) 1 and 5
C) 3 and 2
B) 2 and 4
D) 4 and 3
in the vacuole
on the plasma membrane
in the lysosome
at ribosomes
11. Molecule 3 is formed as a result of
A)
B)
C)
D)
deamination
dehydration synthesis
enzymatic hydrolysis
oxidation
12. Which elements are present in all organic compounds?
A)
B)
C)
D)
hydrogen and oxygen
nitrogen and oxygen
nitrogen and carbon
hydrogen and carbon
13. Enzymes are produced as a direct result of which
process?
A)
B)
C)
D)
protein synthesis
photosynthesis
respiration
enzymatic hydrolysis
Thompson
Biochemistry
15. Base your answer to the following question on the diagram below. For each of the following phrases, select
the molecule, chosen from those shown below, which is best described by that phrase.
An example of a carbohydrate
A) 1
B) 2
C) 3
16. Base your answer to the following question on The
diagram below represents the building block of a large
molecule known as a
D) 4
E) 5
19. Compound X increases the rate of the reaction shown
below.
Compound X is most likely
A) protein
C) carbohydrate
B) fatty acid
D) nucleic acid
17. The process by which glucose is converted to starch is
known as
A)
B)
C)
D)
protein hydrolysis
dehydration synthesis
chemical digestion
cellular respiration
18. Which chemical reaction is represented by the diagram
below?
A)
B)
C)
D)
dehydration synthesis of a dipeptide
hydrolysis of a polypeptide
dehydration synthesis of a lipid
hydrolysis of a disaccharide
A) an enzyme
C) an indicator
B) a lipid molecule
D) an ADP molecule
20. Photosynthesis transforms molecules of water and
carbon dioxide into molecules of
A)
B)
C)
D)
carbohydrate and oxygen
carbohydrate and nitrogen
polypeptide and oxygen
polypeptide and nitrogen
21. The diagram below represents some steps in a chemical
reaction involving a carbohydrate.
Which substance must be added at Y to complete this
reaction?
A) water
C) DNA
B) protease
D) RNA
Thompson
Biochemistry
22. In a living cell, which compound serves primarily as a
substance in which most molecules and ions are
dissolved?
A) glycerol
C) water
26. The diagram below illustrates a biochemical process
that occurs in organisms.
B) glucose
D) cellulose
23. Luciferin is a molecule that, when broken down in
fireflies, produces heat and light. The rate at which
luciferin is broken down in cells is controlled by
A) a carbohydrate
C) an enzyme
B) a simple sugar
D) a complex fat
24. Base your answer to the following question on the
chemical reactions below and on your knowledge of
biology.
The substance labeled "catalyst" is also known as
A)
B)
C)
D)
a hormone
an enzyme
an antibody
an inorganic compound
27. In the enzyme-controlled reaction represented by the
word equation below, which molecules are considered
the substrate?
monosaccharide + monosaccharide
water
A)
B)
C)
D)
The enzymes needed for these chemical reactions are
indicated by letters?
A) W and X
C) B and D
B) A and C
D) B and C
25. Lipase, maltase, and protease are members of a group
of catalysts known as
A) enzymes
C) carbohydrates
B) hormones
D) fats
disaccharide +
monosaccharide and monosaccharide
disaccharide and water
monosaccharide and water
monosaccharide and disaccharide
28. Which substance plays a major role in most of the
chemical reactions that occur in a living cell?
A) water
C) glycerol
B) glycogen
D) maltose
29. Which activity completes an enzyme-controlled
reaction?
A) synthesis of coenzymes by enzymes
B) initial formation of an enzyme-substrate
complex
C) separation of the enzyme and the products of the
reaction
D) destruction of the enzyme
30. The enzyme salivary amylase will act on starch, but not
on protein. This action illustrates that salivary amylase
A)
B)
C)
D)
contains starch
is not reusable
is chemically specific
lacks protein
Thompson
Biochemistry
Base your answers to questions 31 and 32 on the
diagram below which represents an enzyme controlled
reaction and on your knowledge of biology.
31. This reaction best represents
A)
B)
C)
D)
dehydration synthesis
aerobic respiration
hydrolysis
fermentation
32. Which number indicates the enzyme-substrate
complex?
A) 1
B) 2
C) 3
D) 4
Thompson