Biochemistry For Medical Sciences 1 Question Paper
Biochemistry For Medical Sciences 1
Course:Bachelor Of Science In Public Health
Institution: Jomo Kenyatta University Of Agriculture And Technology question papers
Exam Year:2010
INSTRUCTIONS: ANSWER ALL QUESTIONS IN SECTION A AND B AND ONLY ONE IN SECTION C
SECTION A-ANSWER ALL QUESTIONS.EVERY QUESTION HAS ONLY ONE CORRECT ANSWER. A WRONG ANSWER OR GUESS WORK WILL RESULT IN A PENALTY OF 1/2 MARK
QUESTION 1
The following are characterstics of the plasma membrane in prokaryotic cells except
a. lipid bilayer
b. selectively permiable
c. contains electron transparent proteins
d. provide mechanical strength to the cell
QUESTION 2
The site for the synthesis of steroids and complex carbohydrates is:
a. ribosomes
b. rough endoplasmic reticulum
c. smooth endoplasmic reticulum
d.golgi complex
QUESTION 3
The hydrolytic enzymes which digest cell component after death of cells are contained in membrane bound vessels called;
a. lysosome
b.microsomes
c.liposomes
d.ribosomes
QUESTION 4
Which of the following properties of water is responsible for capillary action
a.high boiling point
b.high surface tension
c.high specific heat index
d.high heat of vapourisation
QUESTION 5
The blood of patients suffering from diabetes mellitus may have pH lower than the physiological pH resulting in a condition referred to as:
a. alkalosis
b. acidosis
c. aciduria
d. alkalinity
QUESTION 6
Which is not true for fibrous proteins
a. soluble in aqueous systems
b.physically tough
c.insoluble in water
d.Insoluble in dilute salt solutions
QUESTION 7
Beta pleated sheets are a part of which structure of proteins
a. primary
b. secondary
c. tertiary
d. quarterly
QUESTION 8
Which among the following amino acids functions as a chemical messenger
a.histidine
b.tyrosine
c.glycine
d.serine
QUESTION 9
The following amino acids have an aromatic side chain
a. alanine valine leucine
b. proline alanine valine
c. glycine serine isoleucine
d.phenylalanine tyrosine tryptophan
QUESTION 10
Which of the following carbohydrates is not a reducing sugar
a. glucose
b. sucrose
c. maltose
d. celloblose
QUESTION 11
all except one of the statements below true for nucleotides
a.donors of phosphate groups
b.regulate enzyme activity
c.building blocks of nucleic acids
QUESTION 12
DNA replication involves the enzyme
a. DNA polymerase
b.RNA polymerase
c.DNA replicase
d.DNA duplicase
QUESTION 13
Some of the viruses responsible for causing cancer in humans may induce changes within the chromosomal genetic material through:
a.transposition of genes
b.chromosomal breakage
c.chromosomal recombimation
d.chromosomal intergration
QUESTION 14
State the essential fatty acid among the ones listed below
a.linoleic
b.oleic
c.palmitic
d.stearic
QUESTION 15
Deficiency of vitamin A in infants and young children would lead to
a.rickets
b.beriberi
c.xerophthalmia
d.pellagra
QUESTION 16
Choose the stop codon among the ones given below
a.UAG
b.UAU
c.UCG
d.UAC
QUESTION 17
Pernicious anaemia is caused by deficiency
a.vitamin A
b.vitamin B6
c.Vitamin C
d.vitamin B12
QUESTION 18
The basic protein found in chromosomes together with DNA are called
a.histidine
b.histrons
c.non-histones
d.histones
QUESTION 19
The anticodon is found within the;
a.mRNA
b.tRNA
c.rRNA
d.snRNA
QUESTION 20
pH affects enzymes catalysed reactions through
a.affecting charged state of the enzyme
b.increasing kinetic energy of substrate
c.affecting the movement of molecules
d.increasing binding of substrate molecules
SECTION B:ANSWER ALL QUESTIONS IN THIS SECTION. EACH QUESTION IS 6 MARKS
1. Describe the structure and function of the mitochondrion
2. State any six biological functions of proteins
3. Outline DNA replication
4. Explain the effects of temperature on enzyme catalyzed reactions
5.Briefly describe the types of proteins found in biomembranes
SECTION C: ANSWER ANY ONE QUESTION
6. Discuss protein synthesis (20marks)
7. describe the mechanisms involved in the regulation of enzyme activity (20marks)
8. a. Describe the general structure of a nucleotide (8marks)
b. Describe the types of RNAs found in cells (12marks)
More Question Papers