mcq biology

Kerala PSC Botany Lecturer / Assistant Professor Question Paper: Cat. No. 464/2007: Part 1 (MCQ 010)

Original question paper of Kerala PSC Botany Lecturer/Assistant Professor (Category No. 464/2007) examination conducted by Kerala PSC (Public Service Commission) on 20/06/2009 (Q. Code 196/2009) for the appointment of Botany Lecturer/Assistant Professor in Government Colleges of Kerala under the Directorate of Collegiate Education, Trivandrum, Kerala. Questions are in MCQ (Multiple Choice Questions) format.

Part – 1 (Questions 1 – 25) (MCQ 010)

(1).  Simple collateral vascular bundles are found in :

a.       Equisetum
b.       Lycopodium
c.       Pleopteris
d.       Selaginella

(2).  Sort out the branched alga :

a.       Oedogonium  
b.       Spirogyra
c.       Zygnema
d.       Ectocarpus

(3). P-proteins are found in :

a.       Companion cells
b.      Sieve elements
c.       Pith
d.      Vessels

(4). A mutation in a codon leads to the substitution of one amino acid with another. What is the name for this type of mutation?

a.       Nonsense mutation
b.      Missense mutation
c.       Frame-shift mutation
d.      Promoter mutationContinue reading

biological chemistry

Nucleotide Biosynthesis (De-novo & Salvage Synthesis of Purine & Pyrimidine Nucleotides in the Cells)

“The formation of DNA’s structure by Watson and Crick may turn out to be the greatest developments in the field of molecular genetics in recent years”

Linus Pauling, 1953

Purines (Adenine & Guanine) and pyrimidines (Thymine, Cytosine & Uracil) are the two classes of nucleotides which forms the nucleic acids (DNA & RNA) in the cells. Apart from the primary role of DNA and RNA as “genetic information storage”, nucleotides also serves different functions in the cells such as energy carrier (ATP and GTP), components of co-enzymes (NAD and FAD) and cellular signal transduction (cAMP and cGMP as ‘second messengers’). An ample supply of nucleotides in the cell is very essential for all the cellular processes. This post discuss the biosynthesis of Purines and Pyrimidines in an EASY but detailed way.

Pathways for the biosynthesis of nucleotides

Nucleotide biosynthesis in the cell can be grouped into two broad classes. (1) de-novo synthesis and (2) synthesis by salvage pathways.

I. De-novo synthesis (synthesis from scratch): it is a biochemical pathway in which nucleotides are synthesized new from simple precursor molecules.
II. Salvage pathway (recycle pathway): used to recover bases and nucleosides formed during the degradation of RNA and DNA

Biosynthesis of purine & pyrimidine

Continue reading

biology career opportunities and Notifications

Scientist Job Vacancy Notification 2015 in MoEF (Ministry of Environment, Forest & Climate Change) and Zoological Survey of India

Openings for M.Sc. Botany and Zoology Candidates

Ministry of Environment, Forest & Climate Change (MoEF)
Government of India
Scientist Job Vacancy, Advt. No. 01/02/2015

Applications are invited from Indian citizens for filling up of Twenty Six (26) posts of Scientists on Direct Recruitment Basis in the Ministry of Environment, Forest and Climate Change (MoEF) and Zoological Survey of India (ZOI) as per the details given below.

Details of Job title, Essential qualification, Number of Vacancies/Category wise and Pay Scale:Continue reading

mcq biology

Biophysics MCQ: Electrophoresis: for JRF NET Life Science Examination (Biology MCQ 009): Biophysical Instrumentation: Separation Techniques Part 1

Biology MCQ (Multiple Choice Questions in Life Science)
(Sample/Model/Practice Questions for JRF/NET Life Science Examination, ICMR JRF, DBT JRF, GATE, ICAR NET, PG Entrance)

Biophysical Instrumentation: Separation Techniques Part 1: (MCQ 009)

1). When voltage ‘V’ is applied across a pair of electrode (cathode and anode), a potential gradient ‘E’ is created between the electrodes. We can calculate ‘E’ as:

a.      E = V/d
b.      E = (1/V) x q
c.       E = (Vd)/q
d.      E = V + d

2). The velocity (‘v’) of a charged particles in an electric field in a medium can be mathematically expressed as v = Eq/f, where ‘Eq’ and ‘f’ are ________.

a.      Eq: Energy; f: Frictional force
b.      Eq: Electrical force; f: Gravitational force
c.       Eq: Electrical force; f: Frictional co-efficient
d.      Eq: Equilibrium constant; f: co-efficient of gravity

3). For the separation of DNA by electrophoresis, which of the following method is commonly used?

a.      Agarose – vertical
b.      Agarose – horizontal
c.       PAGE – vertical
d.      PAGE – horizontal

4). Sodium dodecyl sulfate (SDS) used in SDS PAGE is___________.

a.      An anionic detergent
b.      A cationic detergent
c.       A non-ionic detergent
d.      An anion exchanger
e.       A cation exchanger

5). Function of β-mercaptoethanol in SDS-PAGE is__________.

Continue reading

mcq biology

NET Life Science Model Question Paper 2015: Biology MCQ-8: Biochemistry: Amino Acids: Part 4

Biology MCQ (Multiple Choice Questions in Life Science)
(Sample/Model/Practice Questions for JRF/NET Life Science Examination, ICMR JRF, DBT JRF, GATE, ICAR NET, PG Entrance)

MCQ Biochemistry: Amino Acids Part 4 (MCQ 008)

1). Which group of a fully protonated glycine (NH3+ – CH2 – COOH) first release a ‘proton’ when it is titrated against – OH- ions?

a.       Carboxyl group
b.      Amino group
c.       Both at the same time
d.      It cannot be predicted

2). pKa is the measure of a group to __________ proton.

a.       Take up
b.      Release
c.       Combine
d.      Consume

3). Which of the following amino acid bears a guanidine group in the side chain?

a.       Lysine
b.      Arginine
c.       Histidine
d.      Proline

4). The precursor of glycine synthesis in microbes and plants is_______.

a.       Serine
b.      Leucine
c.       Valine
d.      None of these

5). Single letter code of selenocysteine is _____.

Continue reading