DOWNLOAD » MCQs LIFE SCIENCE/BIOTECH
CSIR NET Exam preparation not only need the Study but also need practice which includes MCQs especially of Part C. If you are preparing for GATE/CSIR NET/DBT etc exam then try to practice these MCQs of Life Science and Biotechnology. These MCQs will be updated every weekend and old MCQs will be removed. Every week a New topic will be covered which are teaching in our Regular Batch for CSIR NET and GATE Coaching.
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MCQ 1: Resistance to Penicillin and other beta- lactamase is due to
A. Modification of target PBPs
B. Impaired penetration of drug to target PBPs
C. Presence of an efflux pump
D. Inactivation of antibiotics by beta- lactamase
E. All of the above
Answer: E all of the above..!
MCQ 2: Rifampicin
A. Inhibits hepatic microsomal enzymes
B. Inhibits DNA synthesis
C. Is bactericidal for mycobacteria
D. Is not appreciably protein bound
E. Is predominantly excreted unchanged in the urine
Answer: C Rifampicin is bactericidal because it inhibits RNA polymerase of Bacteria
MCQ 3: A gap gene mutation might cause which of the following defects in the embryonic body plan?
A. Every other segment would be missing, resulting in T1, T3, A2, A4, etc. but no T2, A1, A3, and so on.
B. Segments A2 through A6 would be missing, but the rest of the pattern is essentially normal.
C. No segmentation would be evident.
D. Patterning within each segment would be abnormal, causing for example denticle belts to form across the entire segment.
MCQ 4: Which of the following characteristic differentiate Eubacteria from Archaebacteria?
A. Circular nature of chromosome.
B. Absence of nuclear membrane.
C. Presence of 70S ribosomes.
D. Presence of murein in cell wall.
MCQ 5: H+ ionophore have important role as uncouplers in the electron transport chain. 2,4-dinitrophenol acts as a uncoupling agent. What is the mechanism by which these uncouplers function?
A. It dissipates the proton gradient established across the inner mitochondrial membrane by moving the protons towards matrix
B. These uncouplers disturb the electrochemical proton gradient without blocking their uptake of oxygen.
C. There is reduced affinity for ATP as compared to ADP.
D. None of the above
MCQ 1: Which of the following statements about fatty acids is correct?
A. Fatty acids are used as fuel molecules by all cells.
B. Fatty acids are oxidised to acetyl-CoA.
C. Fatty acids are hydrolysed to acetyl-CoA.
D. Fatty acids are converted to glucose in the liver.
Answer: B, Oxidised to Acetyl CoA not hydrolyzed.
MCQ 2 : Which of the following is true of the lac operon in E. coli?
A. The operon is only switched on in the absence of lactose in the growth medium.
B. The lac operon messenger RNA is a polycistronic mRNA (it carries information for synthesis of several proteins).
C. The enzyme β-galactosidase is only produced in large quantities when thelac repressor is bound to the operator.
D. The promoter is the binding site for the lac repressor
Answer: B, Pro have polycistronic mRNA i.e. multiple continuous genes on a single mRNA.
MCQ 3: Which of the following statement concerning glucose metabolism is NOT CORRECT?
A. Conversion of glucose to pyruvate occurs in cytoplasm
B. Glu enters in intestinal cells by a mechanism in which Na+ and Glu are co-transported
C. Pyruvate kinase catalyzes a reversible reaction
D. Insulin binds to IRS and cause the GLUT transporter to recruit on plasma membrane
Answer: C , PK catalyzes the irreversible reaction in glycolysis pathway.
MCQ 4: What should be the sound frequency ranges used for acoustic communication between two herds of elephants living far apart in isolated forests, domestic dogs in neighbouring streets, and insect feeding bats catching prey above the tree canopy?
A. High frequency, low frequency and ultrasonic, respectively
B. High frequency, human hearing range and ultrasonic, respectively
C. Low frequency, human hearing range and ultrasonic, respectively
D. Ultrasonic, high frequency and high frequency, respectively
Answer: C, Elephant can hear low frequency sound called infrasonic sounds
MCQ 5: Primary succession refers to the sequence of changes in plant communities at a newly formed habitat. Species establishing first at the newly formed habitat (pioneer species) show characteristics that are different from those in species that establish later in the community. Which of the following represents the predicted characteristics of pioneer species?
A. Large dispersal distance, high fecundity, low competitive ability, short lifespan
B.Short dispersal distance, high fecundity, high competitive ability, short lifespan
C. Large dispersal distance, high fecundity, high competitive ability, long lifespan
D. Short dispersal distance, low fecundity, high competitive ability, long lifespan
Answer: A, pioneer species are mainly r-strategic species
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