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WorksheetsHKKN Practice test
Total questions: 45
Worksheet time: 45mins
The living state is
Non-equilibrium unsteady–state
Equilibrium steady–state
Non-Equilibrium steady-state unable to perform work
Non-equilibrium steady-state to be able to perform work
Rate of a chemical reaction can be expressed as
Rate= δP/ δT
Where δP represents
Product formed per unit time
Product formed in total time δt
Reactants present at the beginning of reaction
Amount of reactants which changes into products in unit time
Zinc is a cofactor for an enzyme which breaks peptide bonds present at C-terminal of peptides. The enzyme is
Carboxypeptidase
Aminopeptidase
Carbonic anhydrase
Peroxidase
Food is one of the basic requirement for all living organisms because
It provides energy for degrowth and repair of tissues
It is essential for degrowth of the body
It activates loss of water causing dehydration
It provides energy and organic material for growth and repair of tissues
Oral cavity leads into a common passage for food and air called
Pharynx
Larynx
Nasal chamber
Oesophagus
Which of the following layer of gut wall is formed by mesothelium and some connective tissue
Serosa
Submucosa
Muscularis
Mucosa
Brush border epithelium is present at innermost lining of
Intestinal wall
DCT
Stomach
Trachea
The bile duct and pancreatic duct open together into the duodenum as the
Common hepatic duct
Cystic duct
Common hepato-Pancreatic duct
Common bile duct
Which of the following statement is incorrect?
30 per cent of starch is hydrolysed at pH 6.8
Pepsinogen is converted into pepsin by HCl
Mucus and bicarbonates present in gastric juice protect mucosal epithelium from excoriation by HCl.
Intrinsic factor secreted by peptic cells help in absorption of Vit B12.
All of the following enzymes are present in pancreatic juice except
Amylase
Carboxypeptidase
Nucleotidases
Lipases
Ileo-cecal valve prevents the backflow of faecal matter from
Duodenum to stomach
Large intestine to small intestine
Colon to rectum
Ileum to colon
Gross calorific value of carbohydrates is slightly
Equal to gross calorific value of proteins
More than its physiological value
More than proteins
Less than its physiological value
The condition in which faeces are retained within the colon as the bowel movements occur irregularly, is called
Vomiting
Constipation
Indigestion
Diarrhoea
Read the following statements carefully w.r.t. PEM. Choose the option with all correct statements
(a) Causes wasting of muscles in infants and children
(b) Causes failure of growth and brain development
(c) Some fat is left under the skin in marasmus
(d) Kwashiorkor is found in a child less than one year of age
a & b
b & c
c & d
a & d
Which of the following products of digestion are absorbed by intestinal mucosa by simple diffusion, facilitated transport as well as by active transport?
Fructose and fatty acids
Chylomicron and Na+
Glucose and glycerol
Glucose and amino acids
Enzyme pepsin works in the pH range 1.5 to What would happen to the rate of the reaction controlled by this enzyme, if there is a rise “ from 2.5 to 8?
There will be no effect on rate
The rate first increases then decrease
The rate doubles
The rate starts to decrease
An enzyme obtained from a X source has been classified by enzyme commission and its unique four digit number 1.2.1.4. To which of the following class does it belong?
Hydrolases
Ligases
Isomerases
Oxidoreductases
In competitive inhibition, Km value
Decreases
Increases
Remains unchanged
First increases then decreases
Which of the following secondary metabolites belong to toxin category?
Codeine
Anthocyanin
ConcanavaIin-A
Abrin
Statement-A : A non-competitive inhibitor binds the enzyme at a site distinct from that to which substrate binds.
Statement-B : The competitive inhibitor does not affect the rate of breakdown of the enzyme- substrate complex.
Choose the correct answer.
Both correct
Both incorrect
only A is correct
only B is correct
Select the correct set of structure of protein which gives 3-dimensional view.
Quaternary, primary
Tertiary, quaternary
Secondary, tertiary
Primary, secondary
Inhibition of hexokinase by glucose-6-phosphate is an example of
Non-competitive and irreversible process
Allosteric modulation
Competitive and reversible process
Competitive and irreversible process
Which of the following statement is incorrect
w.r.t. enzyme
Enzymes lower the activation energy which is required to start a reaction
Enzymes substrate complex formation is an obligatory & transient phenomenon
Enzymes are highly efficient at any temperature
Active site of an enzyme is a crevice or pocket into which the substrate fits
Which of the following co-factor forms coordination bonds with active site of enzyme as well as with substrate?
Prosthetic group
Riboflavin
Metal ions
Co-enzyme
Read the following statements and choose the
correct option.
(A) Irreversible inhibition of enzyme activity occurs when an inhibited enzyme does not regain activity upon dilution of the enzyme inhibitor complex by addition of substrate.
(B) Inhibitors always compete with the substrate for binding with active site of an enzyme.
(C) Dilution of the enzyme — inhibitor complex by adding more amount of substrate helps in attaining the Vmax in competitive inhibition.
A and B are correct, C is incorrect
B and C are correct, A is incorrect
A and C are correct, B is incorrect
A, B and C are incorrect
Metabolic pathways can lead to a more complex structure from a simple structure, for example
Hydrolysis of nucleic acid into nucleotides
Breakdown of protein into amino acid
Acetic acid becomes cholesterol
Conversion of glucose into lactic acid
Select the type of enzyme involved in following reaction in which ‘Q’ represents group other than hydrogen
P — Q + R —> P + R — Q
Sucrase
Transferase
Ligases
Isomerase
Identify X & Y in the given graph
X-axis- Temperature Y-axis- Substrate concentration
X-axis- Temperature Y-axis- pH
X-axis- pH Y-axis- Enzymatic action
X-axis- pH Y-axis- Substrate concentration
DNA polymerase is a
Protein
Lipid
RNA
DNA
Consider the following statements.
(A) Coenzyme or metal ion that is tightly bound to enzyme protein is called prosthetic group.
(B) A complete catalytic active enzyme with its bound prosthetic group is called apoenzyme.
Select the correct option.
(A) is false but (B) is true
Both (A) and (B) are true
(A) is true but (B) is false
Both (A) and (B) are false
Identify the correct statement with reference to human digestive system
Ileum opens into small intestine
Serosa is the innermost layer of the alimentary canal
IIeum is a highly coiled part
Vermiform appendix arises from duodenum
Match the following structures with their respective location in organs.
(A) Crypts of Lieberkuhn (i) Pancreas
(B) Glisson’s Capsule (ii) Duodenum
(C) Islets of Langerhans (iii) Small intestine
(D) Brunner’s Glands (iv) Liver
Select the correct option from the following
(A) (iii) (B) (ii) (C) (i) (D) (iv)
(A) (iii) (B) (i) (C) (ii) (D) (iv)
(A) (ii) (B) (iv) (C) (i) (D) (iii)
(A) (iii) (B) (iv) (C) (i) (D) (ii)
Which of the following terms describes human dentition?
Thecodont, Diphyodont, Homodont
Thecodont, Diphyodont, Heterodont
Pleurodont, Monophyodont, Homodont
Pleurodont, Diphyodont, Heterodont
The enzyme enterokinase helps in conversion of
protein into polypeptides
trypsinogen into trypsin
caseinogen into casein
pepsinogen into pepsin
Identify the cells whose secretion protects the lining of gastro-intestinal tract from various enzymes.
Duodenal cells
Chief cells
Goblet cells
Oxyntic cells
Match the items given in column I with those in column II and choose the correct option.
Column I Column II
A. Rennin (i) Vitamin B12
B. Enterokinase (ii) Facilitated transport
C. Oxyntic cells (iii) Milk proteins
D. Fructose (iv) Trypsinogen
A-iii, B-iv, C-ii, D-i
A-iv, B-iii, C-i, D-ii
A-iv, B-iii, C-ii, D-i
A-iii, B-iv, C-i, D-ii
Anxiety and eating spicy food together in an otherwise normal human, may lead to
indigestion
jaundice
diarrhoea
vomitting
Identify below given diagram & select labelled structure which is structural constituent of lymphatic system
X
Y
Z
P
Identify the given diagram & identify labelled part which contains rugae in stomach & villi in intetsine
P
Q
R
S
Dental formula for diphyodont teeth of human
0021/0021
2103/2103
2102/2102
2123/2123
The amount of heat liberated from complete combustion of 1 g fat in a bomb calorimeter is
4.1 kcal/g called physiologic values
5.65 kcal/g called gross calorific value
4 kcal/g called physiologic values
9.45 kcal/g called gross calorific value
Read the following statements
a. Kwashiorkar is produced only by protein deficiency in children more than one year in age
b. Malnutrition is a term which covers problems of undernutrition
c. Inflammation of liver is called cholecyctitis
Select correct statements
a & b
b & c
a & c
All
Procarboxypeptidase is converted into carboxypeptidase by the action of enzyme which is present in
Intestinal lumen
Succus entericus
Saliva
Gastric juice
A) hormonal control of the secretion of digestive juices is carried out by hormones produced by the gastric & intestinal mucosa
B) these hormones include secretin & GIP, secreted from gastric & intestinal mucosa respectively
Identify the correct statements
both are correct
both are incorrect
Only A is correct
Only B is correct
Match the column
a) Brunner's gland i) Present in mucosa of small intestine
b) Wharton's duct ii) Duct of salivary gland
c) Kupffer cell iii) Macrophages of liver
d) Crypts of Leiberkuhn iv) Exclusively present in wall of duodenum
a)- iv b)- iii c)- ii d)- i
a)- iv b)- ii c)- iii d)- i
a)- i b)- iii c)- ii d)- iv
a)- iv b)- iii c)- i d)- ii
