Font size
WorksheetsMidterm Examination
Total questions: 90
Worksheet time: 2hrs 40mins
It is the liquid portion of blood; our red and white blood cells and platelets are suspended in plasma as they move throughout our bodies.
Plasma
Platelets
White Blood Cells
Red Blood Cells
This are chemical structures composed of proteins that receive and transduce signals that may integrated into biological systems.
Structural Proteins
Transport Proteins
Receptors Proteins
Regulatory Proteins
Choose in the following statement which correspond the correct answer.
I. Red blood cells survive only about 9 days in the bloodstream and are constantly being replaced by new platelets made by the bone marrow.
II. Each day, the body makes new RBCs to replace those that die or are lost from the body.
III. Serum is the fluid and solute component of blood which does not play a role in clotting. It may be defined as blood plasma without the clotting factors, or as blood with all cells and clotting factors removed.
IV. The white blood cell count in someone with an infection often is higher than usual because more RBCs are being made or are entering the bloodstream to battle the infection.
I,II, IV
II, III
II, III, IV
I, III, IV
(a) is essential in maintaining normal osmotic pressure and therefore the water balance of the body.
It is a type of disease that inherited red blood cell disorder in which there aren't enough healthy red blood cells to carry oxygen throughout your body.
Sickle Cell Disease
Kwashiorkor
Marasmus
Anemia
These are proteins derived from simple or conjugated proteins by physical or chemical means.
(a)
It is a type of protein test, which has the presence of peptide bond.
Ninhydrin Test
Xanthoproteic Test
Molisch’s Test
Biuret Test
___________ are one of the body’s defenses against disease: some destroy bacteria and others create antibodies against bacteria and viruses or fight malignant disease.
Leukocytes
Thrombocytes
Erythrocytes
Hemoglobin
Which of the following is not correct pair:
mucin – saliva
salmine – salmon
keratin – hair
elastin – bones
This are the proteins that act as storage for amino acids or specific ligands such as biologically important metal ions.
Structural Proteins
Catalytic Proteins
Genetic Proteins
Storage Protein
This type of simple proteins is insoluble in all solvents mentioned; least soluble among all simple proteins; comes only from animals also known as scleroproteins.
Glubolins
Albuminoids
Histones
Protamines
It is a type of conjugated proteins linked with fatty acids is called as (a) .
It is insoluble protein products produced by the action of heat or alcohol on proteins.
Coagulated proteins
Metaproteins
Proteans
Proteoses
(a) is a fluid that transports oxygen and nutrients to the cells and carries away carbon dioxide and other waste products.
Interactions such as ionic bonds, disulfide bridges, and hydrophobic interactions within a single polypeptide chain are examples of protein __________ structure.
Primary
Secondary
Tertiary
Quaternary
Regarding polypeptides, which statement is false?
Many peptides joined together form polypeptides
Proteins contain thousands peptide bonds
Often form rigid and planar units
Can form an unlimited number of configurations
Polarity compounds are also "water loving."
True
False
Our bodies can synthesize some of the essential amino acids we need, but where can we get all the ones we cannot synthesize?
eating animal protein
eating plant protein
taking a supplement
drinking plenty of water
The building up of large complex substances from many small individuals units with the release of water is called ________.
hydrolysis
peptide formation
dipeptide assimilation
dehydration synthesis
What is the main function of protein in the body?
Is the main source of energy for the body.
Helps to build and repair body tissue.
Provide warmth and cushioning to the body's organs.
Helps to transport vitamins through the body.
All of the above.
The order of amino acids determines the ______ and ultimately the function of a protein.
shape
flavor
color
texture
The reaction used to digest and break the bond in red is___________.
Hydrolysis
Dehydration Synthesis
Oxidation
Single Displacement
What elements make up amino acids?
Carbon, hydrogen and oxygen only
Carbon, hydrogen, oxygen and nitrogen only
Carbon, hydrogen and phosphorus only
Carbon, hydrogen, nitrogen and oxygen; and sometimes also sulfur
Protein is _______________.
A polymer composed of many sugars.
A polymer composed of many amino acids.
A polymer composed of fatty acids.
A polymer composed of nucleotides.
Which statement is mismatched?
The quaternary structure is related to the basic linear structure of a protein
The primary structure relates to the basic linear structure of a protein
The secondary structure relates to the helical shape of a protein
The tertiary structure is a higher level of protein folding
Which of the following is NOT a function of a protein?
Storing energy for long periods of time in a small space
Building structures
speeding up reactions
storage
Linking several amino acids together produces what polymer?
polysaccharide
polypeptide
polynucleotide
triglyceride
Actin and Myosin are proteins that work together to allow muscle movement. These are both what type of protein?
structural
contractile
storage
transport
What monomer of a protein is being shown?
monosaccharide
amino acid
amino acid
nucleotide
What type of protein would the collagen be? (Collagen keeps your skin shaped smooth and your joints elastic.)
structural
transport
storage
contractile
Which of the following is/are correct?
I. Peptide bond is non-planar.
II. Peptide bond has partial double bond character.
II only
I only
Both
Neither
Which of the following food products are high in protein content?
Tofu and eggs
Grains and legumes
Milk and milk products
All of the above
Which of the following is not true about secondary protein structure?
The hydrophilic/hydrophobic character of amino acid residues is important to secondary structure
The ability of peptide bonds to form intramolecular hydrogen bonds is important to secondary structure
The alpha helix, beta pleated sheet and beta turns are examples of protein secondary structure
The steric influence of amino acid residues is important to secondary structure
β-pleated sheets are the examples of _________
Primary structure
Secondary structure
Tertiary structure
Quaternary structure
Which of the following is false?
The two main types of secondary structure are the α helix and β pleet structures
α helix is a right handed coiled strand
The hydrogen bonding in a β-sheet is between strands rather than within strands
The hydrogen bonding in a β-sheet is within strands rather than between strands
Which of the following statements is false?
Primary structure of a protein determines how it folds up into a unique three dimensional structure
Secondary structure of a protein determines how it folds up into a unique three dimensional structure
Three dimensional structure of a protein determines the function of a protein
Amino acid sequence is absolutely invariant for a particular protein
Which of the following is an imino acid?
Alanine
Glycine
Proline
Serine
Which of the following is an essential amino acid?
Phenylalanine
Glutamine
Asparagine
Cysteine
Which among the following is a non-essential amino acid?
Serine
Threonine
Lysine
Histidine
Identify the amino acids containing nonpolar, aliphatic R groups.
Phenylalanine, tyrosine, and tryptophan
Glycine, alanine, leucine
Lysine, arginine, histidine
Serine, threonine, cysteine
Unfolding of a protein can be termed as _________
Renaturation
Denaturation
Oxidation
Reduction
Which of the following information is responsible to specify the three-dimensional shape of a protein?
The protein’s peptide bond.
The protein’s amino acid sequence.
The protein’s interaction with other polypeptides.
The protein’s interaction with molecular chaperons.
Which part of the amino acid gives it uniqueness?
Amino group
Amino group
Side chain
None of the above
During the formation of the peptide bond which of the following takes place?
Hydroxyl group is lost from its carboxyl group of one amino acid and a hydrogen atom is lost from its amino group of another amino acid
Hydrogen atom is lost from its carboxyl group of one amino acid and a hydroxyl group is lost from its amino group of another amino acid
Hydroxyl group is lost from its carboxyl group of one amino acid and a hydroxyl group is lost from its amino group of another amino acid
Hydrogen atom is lost from its carboxyl group of one amino acid and a hydrogen atom is lost from its amino group of another amino acid
Which of the following diseases is caused by protein deficiency?
Anaemia
Kwashiorkor
Hypothyroidism
All of the above
Which of the following is not the function of proteins?
Helps in digesting food.
Carries genetic information.
Fights against the invading pathogens.
Helps in transporting oxygen in the blood.
Which of the following statements is true about proteins?
Proteins are polymers of glucose.
Proteins are polymers of amino acids.
Proteins are polymers of peptide bonds.
Proteins are polymers of disulfide bridges.
Which of the following statements is true about proteins?
Proteins are made up of amino acids.
Proteins are essential for the development of skin, teeth and bones.
Protein is the only nutrient that can build, repair and maintain body tissues.
All of the above
Which of the following factors is not responsible for the denaturation of proteins?
Heat
Charge
pH change
Organic solvents
The primary structure of protein represents ____________.
Linear sequence of amino acids joined by peptide bond.
Three-dimensional structure of protein.
helical structure of protein.
sub-unit structure of protein
The amino acid containing hydroxyl group.
Alanine.
Threonine.
Arginine.
Isoleucine.
Out of 200 different amino acids found in nature the number of amino acids present in protein.
20
25
30
35
What kind of protein interactions are disrupted by the addition of an alcohol?
Covalent bond
Salt bridges
peptide bond
hydrogen bond
How do acids denature proteins?
They modify the pH, disrupting the salt bridges
They break the primary structure and amino acids are rearranged
They increase the kinetic energy of the molecules, disrupting any type of bonds
They only disrupt the interactions between subunits
What is protein coagulation?
The formation of new interactions among denatured proteins
The aggregation of tertiary structures
The break of the peptide chain
The loss of native protein structure
What happens when you fry an egg?
Proteins from the yolk are transferred to the egg white
Broken amino acids form new proteins
Denatured proteins form new interactions
Heat removes water from the egg white, leading to the formation of a solid
Three types of RNA cooperate to perform translation.
A : Read codons and deliver the amino acids.
B : Carry the genetic information from DNA.
C : Catalyze the assembly of polypeptide chains.
Which type of RNA matches the A, B, and C descriptions, respectively?
rRNA, mRNA, tRNA
tRNA, mRNA, rRNA
mRNA, rRNA, tRNA
rRNA, tRNA, mRNA
What is the name of each sequence of three nitrogen-containing bases of RNA that codes for one amino acid?
Codon
Base
Units
Anticodon
DNA and mRNA M R N A synthesis proceeds in the 5' five prime to 3' three prime direction. What does 5' five prime and 3' three prime mean?
The number of carbons in the nitrogen base
The position of the phosphate and nitrogen bases
The position of a carbon atom in the sugar backbone
The number of hydroxyl groups attached
(a) are proteins that participate in the immune response by depending the body against antigens.
Keratin: hair ; collagen: ___________
silkworm
hemoglobin
tendons
bones
(a) is the first product produced by the action of acids, enzymes or water on proteins.
Abnormal destruction of bone marrow by chemicals, drugs or radiation. it is a type of anemia is called (a) .
The actual order of the amino acids in the protein is called its primary structure and is determined by (a) .
___________ refers to electrical interactions between close atoms or molecules.
Hydrophobic Bond
Hydrogen Bond
Van der Waals interactions
Ionic Bond
(a) are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules.
Berzelius suggested the name proteins to the group of organic compounds that are utmost important to life.
True
False
.In some proteins, such as antibody molecules, several polypeptides may bond together to form a _________ structure.
primary
secondary
tertiary
quaternary
These amino acids are also referred to as hydrophobic (water hating). They have no charge on the ‘R’ group.
Non-polar amino acids
Polar amino acids with no charge on ‘R’ group
Polar amino acids with positive ‘R’ group
Polar amino acids with negative ‘R’ group
__________ function certain proteins perform brick and mortar roles and are primarily responsible for structure and strength of body.
Contractile
Structural
Dynamic
Transport
The subsequent RNA sequence will be translated into protein in a process is called ___________.
translation
replication
transcription
mRna
Which of the following is TRUE about RNA?
Ribosomes have a large and small subunit, each
constructed from ribosome RNA (rRNA) and protein.
It can store information similar
to DNA.
It is a molecule that contains the instructions an organism needs to develop, live and reproduce.
None of the above
It is produced in the nucleus and transported to the cytoplasm.
mRNA
tRNA
rRNA
regulatory RNA's
____________ is a blue liquid that contains copper sulfate (CuSO4) and sodium hydroxide (NaOH).
Ninhydrin Test
Schiff’s Test
Sakaguchi’s Test
Biuret's Test
Which of the following is NOT TRUE about White Blood Cells?
It contain hemoglobin a protein that carries oxygen.
The immune system helps the body defend itself against infection.
Blood contains far fewer WBCs than red blood cells, although the body can increase WBC production to fight infection.
It is a condition in which the number of red blood cells or the amount of hemoglobin is below normal.
Anemia
Sickle cell disease
hemorrhage
Malnutrition
These are simple proteins combined with some non-protein material in the body.
(a)
Malnutrition/malnourishment is defined as:
an overabundance of food consumption
the consumption of glow stick fluid
an imbalance in the diet that leads to disease
the consumption of toxic chemicals
Keratin is a type of protein that:
dispenses sugar into our blood
builds our hair and nails
attacks foreign invaders in our immune system
picks up oxygen molecules and carry them through our body
Which describes the functions of proteins in living things?
structural, transport, signaling, catalysts, etc.
stores and transmits genetic information
stores energy and makes up cell membranes
quick energy and forming cell structure
Hemoglobin is a protein that binds to oxygen and helps carry it in the blood and deliver it to other parts of the body. This is an example of what type of protein?
Transport
Signaling
Storage
Contractile
Antibodies protect the body from pathogens. What type of proteins are they considered?
Transport
Signaling
Defense
Contractile
Examples of coagulation taking place is:
Fried egg, lemon tart, quiche
Chicken nuggets, quiche, boiled egg
Burger, quiche, cake
Biscuits, fried egg, lemon tart
Proteins are characterised by primary, secondary and tertiary structures. Which of the descriptions correctly describes these structures?
The primary structure describes the folded chain of amino acids that form an alpha helix or beta pleated sheet. The secondary structure defines the bonds that create these chains while tertiary structure shows their location.
The primary structure describes a chain of amino acids that can be folded into an alpha helix forming the secondary structure. The tertiary structure is formed when the chains coil up forming a beta pleated sheet.
The primary structure describes a chain of amino acids that can be folded into an alpha helix or beta pleated sheet, the secondary structure. These folded chains can further coil up and create three-dimensional structures known as tertiary structure.
The primary structure describes a chain of amino acids that can be folded into an alpha helix or beta pleated sheet forming the secondary structure. These folded chains can join together forming multiple units, the tertiary structure.
Why is folding so important in proteins?
It gives them a unique, functional shape
It makes them look tidier
It makes every protein molecule different from the next even if they are the same type
The folding is random so is not that important at all
What are some factors that can lead to protein denaturation? State and explain your answer. (5pts)
(Please manage your time to answer the question make it brief and concise)
What are the importance of proteins for living organisms? (5pts)
(Please manage your time to answer the question make it brief and concise)
Explain at least 3 functions of proteins. (5pts)
(Please manage your time to answer the question make it brief and concise)
