Showing posts with label Biology MCQs. Show all posts
Showing posts with label Biology MCQs. Show all posts
Saturday, January 11, 2014
Biology Part 1 Unit # 3 MCQs
1-Most important group of proteins which r biologically active are
A-harmoglobin
B-enzymes
C-inhibitors
D-both b and c
2- where does the catalytic activity takes place in enzyme
A-binding site
B-catalytic site
C-active site
D-globular site
3-in there action enzymes r very
A-general
B-precise
C-specific
D-exact
4-the non protein part essential for its proper funtioning
A-activator
B-co-enzyme
C-co-factor
D-prosthetic group
5-what acts as a bridge b/w enzyme &. its sybstrate
A-active site
B-globular shape of enzyme
C-co-factor
D-both a & c
6-the detachable inorganic part of enzyme
A-prosthetic group
B-co-enzyme
C-activitor
D-co-factor
7-enzymes important in photosynthesis n cellular respiration are found in
A-mithochondria & chromoplast
B-cell wall & cell membrane
C-chloroplast & mithochondria
D-E.R & golgi bodies
8-which statement about enzyme is not true
A-they consists of protein with or without a non-protein part
B-they changed the rate of catalytic reaction
c-they r sensitive to heat
D-they increases the activation energy
9-the active site of an enzyme
A-never changes
B-forms no chemical bonds with substrate
C-determines,by its structure the specificity of enzyme
D-looks like a lump projecting from the surface of enzyme
10-the rate of an enzyme catalysed reaction
A-is constant under all conditions
B-decreases as substrate concentration increases
C-cannot be measured
D-can be reduced by inhibitors
Q:11: The enzyme minus its coenzyme is referred to as the
(A) Iso-enzyme
(B) Metalloenzyme
(C) Apoenzyme
(D) All of these
Q:12: The “lock and key” model of enzyme action illustrates that a particular enzyme molecule
(A) forms a permanent enzyme-substrate complex
(B) may be destroyed and resynthesized several times
(C) interacts with a specific type of substrate molecule
(D) reacts at identical rates under all conditions
Q:13: A catalyst is a chemical involved in, but not ____________ by, a chemical reaction.
(A) Supported
(B) Changed
(C) Controlled
(D) All of these
Q:14: An inhibitor that changes the overall shape and chemistry of an enzyme is known as a(n)
(A) Auto-steric inhibitor
(B) Competitive inhibitor
(C) Steric inhibitor
(D) Noncompetitive inhibitor
Q:15: Non-protein components of enzymes are known as
(A) Coenzymes
(B) Activators
(C) Cofactors
(D) All A, B, and C
Q:16: An enzyme is generally named by adding ________ to the end of the name of the ____________.
(A) "-ase". coenzyme
(B) "-ase". cell in which it is found
(C) "-ose". substrate .
(D) "-ase". substrate
Q:17: The minimum amount of energy needed for a process to occur is called the
(A) Minimal energy theory
(B) Process energy
(C) Kinetic energy
(D) Activation energy
Q:18: A student conducts an experiment to test the efficiency of a certain enzyme. Which would probably not result in a change in the enzyme's efficiency?
(A) Adding an acidic solution to the setup
(B) Adding more substrate but not enzyme
(C) Increasing temperature of solution
(D)All a, b, & c change enzyme's efficiency
Q:19: Enzymes function as
(A) Organic catalysts
(B) Inorganic catalysts
(C) Inhibitors
(D) All of these
Q:20: A catalyst is a chemical involved in, but not ____________ by, a chemical reaction.
(A) Supported
(B) Changed
(C) Controlled
(D) All of these
Q:21: An activated enzyme made of polypeptide chain and a co-factor is
(A) Coenzyme
(B) Substrate
(C) Apoenzyme
(D) Holoenzyme
Q:22: Koshland in 1959 proposed
(A) Fluid mosaic model
(B) Induce fit model
(C) Lock and key model
(D) Reflective index model
Q:23: Enzymes are largely _________________________ in their chemical nature.
(A) Lipids
(B) Steroids
(C) Proteinaceous
(D) All A, B and C
Q:24: Who proposed “lock and key” model to study enzyme – substrate interaction?
(A) Koshland (1959)
(B) Wilhelm Kuhne (1878)
(C) Fischer (1890)
(D) None of these
Q:25: Many enzymes function by __________________ the activation energy of reactions.
(A) Increasing
(B) Promoting
(C) Lowering
(D) Both A and B
Q:26: An uncatalysed reaction requires a
(A) Higher activation energy
(B) Lower activation energy
(C) Balanced activation energy
(D) All of these
Q:27: The first step in any reaction catalysed by an enzyme is the formation of a specific association between the molecules called an
(A) Enzyme-product complex
(B) Enzyme-intermediate complex
(C) Enzyme-substrate complex
(D) None of these
Q:28: The function of competitive inhibitors is defined by their ability to interact or bind to
(A) The active site of an enzyme
(B) Regulatory sub-units of an enzyme
(C) Non-competitive inhibitor
(D) Enzyme cofactors
Q:29: If an enzyme solution is saturated with substrate, the most effective way to obtain an even faster yield of products would be
(A) Add more of the enzymes
(B) Add more substrate
(C) Add an allosteric inhibitor
(D) Add a non-competitive inhibitor
Q:30: _____________ occurs when the inhibitory chemical, which does not have to resemble the substrate, binds to the enzyme other than at the active site.
(A) Noncompetitive Inhibition
(B) Competitive Inhibition
(C) Uncatalysed reaction
(D) All A, B and C
Q:31: Enymes are highly specific for a given substrate which is due to the shape of their
(A) Active site
(B) Allosteric site
(C) Non-competitive site
(D) None of these
Q:32: Proteinaceous part of holoenzyme is
(A) Prosthetic group
(B) Apoenzyme
(C) Lecithin
(D) None of these
Q:33: The "lock and key hypothesis" attempts to explain the mechanism of
(A) vacuole formation
(B) pinocytosis
(C) sharing of electrons
(D) enzyme specificity
Q:34: An enzyme that hydrolyzes protein will not act upon starch. This fact is an indication that enzymes are
(A) hydrolytic
(B) specific
(C) catalytic
(D) synthetic
Q:35: The site where enzyme catalyzed reaction takes place is called?
(A) Active site
(B) Allosteric site
(C) Denatures site
(D) Dead Site
Q:36: What is a cofactor?
(A) Inorganic ions
(B) Organic molecules
(C) Both a and b
(D) None of the above
Q:37: At high temperature the rate of enzyme action decreases because the increased heat
(A) Changes the pH of the system
(B) Alters the active site of the enzyme
(C) Neutralize acids and bases in the system
(D) Increases the concentration of enzymes
Q:38: Which of the following enzymes would digest a fat?
(A) sucrase
(B) protease
(C) Ligase
(D) lipase
Q:39: In the Lock and Key model of enzyme action, the part of the enzyme that recognizes the substrate is known as the
(A) Enzyme-substrate complex
(B) Product
(C) Enzyme-product complex
(D) Active site
Q:40: Which one is not attribute of enzyme
(A) Specific in nature
(B) Protein in chemistry
(C) Consumed in reaction
(D) Increases rate of reaction
Correct ans=B,C,C,C,C,C,C,D,C,D,C,C,B,D,D,D,D,D,A,B,D,B,C,C,C,A,C,A,A,A,A,B,D,B,A,C,B,D,D,c
A-harmoglobin
B-enzymes
C-inhibitors
D-both b and c
2- where does the catalytic activity takes place in enzyme
A-binding site
B-catalytic site
C-active site
D-globular site
3-in there action enzymes r very
A-general
B-precise
C-specific
D-exact
4-the non protein part essential for its proper funtioning
A-activator
B-co-enzyme
C-co-factor
D-prosthetic group
5-what acts as a bridge b/w enzyme &. its sybstrate
A-active site
B-globular shape of enzyme
C-co-factor
D-both a & c
6-the detachable inorganic part of enzyme
A-prosthetic group
B-co-enzyme
C-activitor
D-co-factor
7-enzymes important in photosynthesis n cellular respiration are found in
A-mithochondria & chromoplast
B-cell wall & cell membrane
C-chloroplast & mithochondria
D-E.R & golgi bodies
8-which statement about enzyme is not true
A-they consists of protein with or without a non-protein part
B-they changed the rate of catalytic reaction
c-they r sensitive to heat
D-they increases the activation energy
9-the active site of an enzyme
A-never changes
B-forms no chemical bonds with substrate
C-determines,by its structure the specificity of enzyme
D-looks like a lump projecting from the surface of enzyme
10-the rate of an enzyme catalysed reaction
A-is constant under all conditions
B-decreases as substrate concentration increases
C-cannot be measured
D-can be reduced by inhibitors
Q:11: The enzyme minus its coenzyme is referred to as the
(A) Iso-enzyme
(B) Metalloenzyme
(C) Apoenzyme
(D) All of these
Q:12: The “lock and key” model of enzyme action illustrates that a particular enzyme molecule
(A) forms a permanent enzyme-substrate complex
(B) may be destroyed and resynthesized several times
(C) interacts with a specific type of substrate molecule
(D) reacts at identical rates under all conditions
Q:13: A catalyst is a chemical involved in, but not ____________ by, a chemical reaction.
(A) Supported
(B) Changed
(C) Controlled
(D) All of these
Q:14: An inhibitor that changes the overall shape and chemistry of an enzyme is known as a(n)
(A) Auto-steric inhibitor
(B) Competitive inhibitor
(C) Steric inhibitor
(D) Noncompetitive inhibitor
Q:15: Non-protein components of enzymes are known as
(A) Coenzymes
(B) Activators
(C) Cofactors
(D) All A, B, and C
Q:16: An enzyme is generally named by adding ________ to the end of the name of the ____________.
(A) "-ase". coenzyme
(B) "-ase". cell in which it is found
(C) "-ose". substrate .
(D) "-ase". substrate
Q:17: The minimum amount of energy needed for a process to occur is called the
(A) Minimal energy theory
(B) Process energy
(C) Kinetic energy
(D) Activation energy
Q:18: A student conducts an experiment to test the efficiency of a certain enzyme. Which would probably not result in a change in the enzyme's efficiency?
(A) Adding an acidic solution to the setup
(B) Adding more substrate but not enzyme
(C) Increasing temperature of solution
(D)All a, b, & c change enzyme's efficiency
Q:19: Enzymes function as
(A) Organic catalysts
(B) Inorganic catalysts
(C) Inhibitors
(D) All of these
Q:20: A catalyst is a chemical involved in, but not ____________ by, a chemical reaction.
(A) Supported
(B) Changed
(C) Controlled
(D) All of these
Q:21: An activated enzyme made of polypeptide chain and a co-factor is
(A) Coenzyme
(B) Substrate
(C) Apoenzyme
(D) Holoenzyme
Q:22: Koshland in 1959 proposed
(A) Fluid mosaic model
(B) Induce fit model
(C) Lock and key model
(D) Reflective index model
Q:23: Enzymes are largely _________________________ in their chemical nature.
(A) Lipids
(B) Steroids
(C) Proteinaceous
(D) All A, B and C
Q:24: Who proposed “lock and key” model to study enzyme – substrate interaction?
(A) Koshland (1959)
(B) Wilhelm Kuhne (1878)
(C) Fischer (1890)
(D) None of these
Q:25: Many enzymes function by __________________ the activation energy of reactions.
(A) Increasing
(B) Promoting
(C) Lowering
(D) Both A and B
Q:26: An uncatalysed reaction requires a
(A) Higher activation energy
(B) Lower activation energy
(C) Balanced activation energy
(D) All of these
Q:27: The first step in any reaction catalysed by an enzyme is the formation of a specific association between the molecules called an
(A) Enzyme-product complex
(B) Enzyme-intermediate complex
(C) Enzyme-substrate complex
(D) None of these
Q:28: The function of competitive inhibitors is defined by their ability to interact or bind to
(A) The active site of an enzyme
(B) Regulatory sub-units of an enzyme
(C) Non-competitive inhibitor
(D) Enzyme cofactors
Q:29: If an enzyme solution is saturated with substrate, the most effective way to obtain an even faster yield of products would be
(A) Add more of the enzymes
(B) Add more substrate
(C) Add an allosteric inhibitor
(D) Add a non-competitive inhibitor
Q:30: _____________ occurs when the inhibitory chemical, which does not have to resemble the substrate, binds to the enzyme other than at the active site.
(A) Noncompetitive Inhibition
(B) Competitive Inhibition
(C) Uncatalysed reaction
(D) All A, B and C
Q:31: Enymes are highly specific for a given substrate which is due to the shape of their
(A) Active site
(B) Allosteric site
(C) Non-competitive site
(D) None of these
Q:32: Proteinaceous part of holoenzyme is
(A) Prosthetic group
(B) Apoenzyme
(C) Lecithin
(D) None of these
Q:33: The "lock and key hypothesis" attempts to explain the mechanism of
(A) vacuole formation
(B) pinocytosis
(C) sharing of electrons
(D) enzyme specificity
Q:34: An enzyme that hydrolyzes protein will not act upon starch. This fact is an indication that enzymes are
(A) hydrolytic
(B) specific
(C) catalytic
(D) synthetic
Q:35: The site where enzyme catalyzed reaction takes place is called?
(A) Active site
(B) Allosteric site
(C) Denatures site
(D) Dead Site
Q:36: What is a cofactor?
(A) Inorganic ions
(B) Organic molecules
(C) Both a and b
(D) None of the above
Q:37: At high temperature the rate of enzyme action decreases because the increased heat
(A) Changes the pH of the system
(B) Alters the active site of the enzyme
(C) Neutralize acids and bases in the system
(D) Increases the concentration of enzymes
Q:38: Which of the following enzymes would digest a fat?
(A) sucrase
(B) protease
(C) Ligase
(D) lipase
Q:39: In the Lock and Key model of enzyme action, the part of the enzyme that recognizes the substrate is known as the
(A) Enzyme-substrate complex
(B) Product
(C) Enzyme-product complex
(D) Active site
Q:40: Which one is not attribute of enzyme
(A) Specific in nature
(B) Protein in chemistry
(C) Consumed in reaction
(D) Increases rate of reaction
Correct ans=B,C,C,C,C,C,C,D,C,D,C,C,B,D,D,D,D,D,A,B,D,B,C,C,C,A,C,A,A,A,A,B,D,B,A,C,B,D,D,c
Biology Part 1 Unit # 2 MCQs
1-A basic kmowledge of biochemistry is essential for understanding physiology and
A-histology
b-cytology
C-anatomy
D-genetics
2-a bacterial cell has carbohydrates in a %age of
A-1%
B-2%
C-3%
D-4%
3-peptide bond is a link in
A-C-N link
B-C-O link
C-N-H link
D-C-H link
4-catabolism is to anabolism as _____ is to ______
A-exergonic,spontaneous
B-exergonic,endergonic
C-free energy,antropy
D-work,energy
5-what is the most abundant compund in the bodies of all organisms?
A-proteins
B-DNA
C-water
D-salts
6-which bond in irganic compound is the potential source of chemical energy?
A-H-H
B-C-H
C-C-N
D-C-C
7-the amount of water in human brain cell is
A-20
B-90
C-85
D-89
8-which on of the following is called cardle of life
A-carbon
B-water
C-DNA
D-enZyme
9-the specific heat capacity of water is
A-0.8
B-1.0
C-0.64
D-0.08
10-animals obtain carbohydrates mainly from
A-glucose
B-starch
C-cellulose
D-glycogen
11-which of the following kind of atoms do not occur in carbohydrates
A-carbon
B-hydrogen
C-nitrogen
D-oxygen
12- the most abundant carbohydrate in nature is
A- pectin
B-glycogen
C-cellulose
D-chitin
13- which on of the following is a carbohydrate
A-chitin
B-cutin
C-fibrin
D-albumin
14-on hydrolysis sucrose produce glucose n
A-glucose
B-fructose
C-lactose
D-galactose
15-our blood normally contains how much glucose
A-0.8%
B-0.08%
C-0.008%
D-none
16-which of the following will give red colour with iodine
A-cellulose
B-starch
C-glycogen
D-amylose
17-lipids r not soluble in which of the following
A-ether
B-alcohol
C-chloroform
D-water
18-how many carbon atoms are present in fatty acids
A-3-7
B-4-30
C-25-35
D-2-25
19-neutral lipids are also called as
A-diglyceride
B-triglyceride
C-terpenoids
D-isopernoids
20-what is the most imprtant organic compound of a cell
A-carbohydrate
B-water
C-lipids
D-proteins
21-which of the following type of RNA is most abundant in a cell
A-mRNA
B-tRNA
C-rRNA
D-complementey RNA
22-what no. of nucleoides will code for a protein of 3000 amino acids
A-3000
B-9000
C-12000
D-1000
23-RNA is synthesized by DNA in a process called
A-replication
B-transformation
C-transcription
D-translation
24-the 1st microbe to have genome cmpletely sequenced
A-E.Coli
B-clostridium tetanu
C-heamophilus influenza
D-thermus aquaticus
25-it is a polynucleotide chain
A-ATP
B-RNA
C-waX
D-base
26-which of the following is a fibrous protein
A-spider web
B-fibrin
C-keratin
D-all of these
27-secondary structure of protein is a characteristic of
A-globular proteins
B-fibrous proteins
C-ellipsoidal proteins
D-oblong proteins
28-who was the 1st scientist to determine the sequence of amino acids in a protein molecule
A-F Meischer
B-F Sanger
C-Murice wilkins
D-P.A leven
29-all are fibrous proteins except
A-silk
B-keratin
C-fibrin
D-enzyme
30-globular proteins differ frm fibrous proteins in
A-having amino acids
B-their repeating units are joined by peptide bonds
C-being soluble in aqueous medium
D-being non-crystalline
Correct ans=c,c,a,b,c,b,c,b,b,b,c,c,a,b,b,c,d,b,b,d,c,b,c,c,b,d,b,b,d,c
A-histology
b-cytology
C-anatomy
D-genetics
2-a bacterial cell has carbohydrates in a %age of
A-1%
B-2%
C-3%
D-4%
3-peptide bond is a link in
A-C-N link
B-C-O link
C-N-H link
D-C-H link
4-catabolism is to anabolism as _____ is to ______
A-exergonic,spontaneous
B-exergonic,endergonic
C-free energy,antropy
D-work,energy
5-what is the most abundant compund in the bodies of all organisms?
A-proteins
B-DNA
C-water
D-salts
6-which bond in irganic compound is the potential source of chemical energy?
A-H-H
B-C-H
C-C-N
D-C-C
7-the amount of water in human brain cell is
A-20
B-90
C-85
D-89
8-which on of the following is called cardle of life
A-carbon
B-water
C-DNA
D-enZyme
9-the specific heat capacity of water is
A-0.8
B-1.0
C-0.64
D-0.08
10-animals obtain carbohydrates mainly from
A-glucose
B-starch
C-cellulose
D-glycogen
11-which of the following kind of atoms do not occur in carbohydrates
A-carbon
B-hydrogen
C-nitrogen
D-oxygen
12- the most abundant carbohydrate in nature is
A- pectin
B-glycogen
C-cellulose
D-chitin
13- which on of the following is a carbohydrate
A-chitin
B-cutin
C-fibrin
D-albumin
14-on hydrolysis sucrose produce glucose n
A-glucose
B-fructose
C-lactose
D-galactose
15-our blood normally contains how much glucose
A-0.8%
B-0.08%
C-0.008%
D-none
16-which of the following will give red colour with iodine
A-cellulose
B-starch
C-glycogen
D-amylose
17-lipids r not soluble in which of the following
A-ether
B-alcohol
C-chloroform
D-water
18-how many carbon atoms are present in fatty acids
A-3-7
B-4-30
C-25-35
D-2-25
19-neutral lipids are also called as
A-diglyceride
B-triglyceride
C-terpenoids
D-isopernoids
20-what is the most imprtant organic compound of a cell
A-carbohydrate
B-water
C-lipids
D-proteins
21-which of the following type of RNA is most abundant in a cell
A-mRNA
B-tRNA
C-rRNA
D-complementey RNA
22-what no. of nucleoides will code for a protein of 3000 amino acids
A-3000
B-9000
C-12000
D-1000
23-RNA is synthesized by DNA in a process called
A-replication
B-transformation
C-transcription
D-translation
24-the 1st microbe to have genome cmpletely sequenced
A-E.Coli
B-clostridium tetanu
C-heamophilus influenza
D-thermus aquaticus
25-it is a polynucleotide chain
A-ATP
B-RNA
C-waX
D-base
26-which of the following is a fibrous protein
A-spider web
B-fibrin
C-keratin
D-all of these
27-secondary structure of protein is a characteristic of
A-globular proteins
B-fibrous proteins
C-ellipsoidal proteins
D-oblong proteins
28-who was the 1st scientist to determine the sequence of amino acids in a protein molecule
A-F Meischer
B-F Sanger
C-Murice wilkins
D-P.A leven
29-all are fibrous proteins except
A-silk
B-keratin
C-fibrin
D-enzyme
30-globular proteins differ frm fibrous proteins in
A-having amino acids
B-their repeating units are joined by peptide bonds
C-being soluble in aqueous medium
D-being non-crystalline
Correct ans=c,c,a,b,c,b,c,b,b,b,c,c,a,b,b,c,d,b,b,d,c,b,c,c,b,d,b,b,d,c
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