GATE Biotechnology Mock Test 4 - Biology Notes Online

Q43 Match products in Group I with microbial cultures in Group II: P. Gluconic acid, Q. Lysine, R. Dextran, S. Cellulase. Group II: 1. Leuconostoc mesenteroides; 2. Aspergillus niger; 3. Brevibacterium flavum; 4. Trichoderma reesei.

(A) P-2, Q-1, R-3, S-4

(B) P-1, Q-3, R-4, S-2

(D) P-3, Q-2, R-4, S-1

Q44 Assertion (A): Cytoplasmic male sterility (cms) is invariably due to defect(s) in mitochondrial function. Reason (R): cms can be overcome by pollinating a fertility restoring (Rf) plant with pollen from a non-cms plant.

(A) both (A) and (R) true; (R) correct reason for (A)

(B) both (A) and (R) true; (R) not correct

(D) (A) false; (R) true

Q45 Thermal death of microorganisms follows first‐order kinetics (k = 0.23 min⁻¹ at 120 °C). Initial concentration 10⁴ cells/mL; acceptable level 10³. Time to reach acceptable load?

(A) 48 min

(B) 11 min

(D) 20 min

Q46 True-breeding Drosophila with curved wings & dark bodies × true-breeding short wings & tan bodies; F₁: curved wings & tan body; F₂: 45 curved/tan, 15 short/tan, 16 curved/dark, 6 short/dark. The mode of inheritance is

(A) Typical Mendelian; curved & dark dominant

(B) Typical non-Mendelian; no pattern

(D) Mendelian with single crossover

Q47 Match Group I with Group II: P. Real-Time PCR; Q. 2-D Electrophoresis; R. Affinity Chromatography; S. Microarray. Group II: 1. Biochips; 2. SYBR Green; 3. Antibody‐linked Sepharose beads; 4. Ampholytes.

(A) P-1, Q-2, R-4, S-3

(B) P-2, Q-3, R-4, S-1

(D) P-3, Q-2, R-1, S-4

Somatic cell gene transfer is used for

transgenic animal production

transgenic diploid cell production

in-vitro fertilization

classical breeding of farm animals

The bacteria known to be naturally competent for transformation of DNA is

Escherichia coli

Bacillus subtilis

Mycobacterium tuberculosis

Yersinia pestis

The degree of inhibition for an enzyme-catalyzed reaction at a particular inhibitor concentration is independent of initial substrate concentration. The inhibition follows

competitive inhibition

mixed inhibition

un-competitive inhibition

non-competitive inhibition

The formation of peptide cross-links between adjacent glycan chains in cell wall synthesis is called

transglycosylation

autoglycosylation

autopeptidation

transpeptidation

Under stress conditions bacteria accumulate

ppGpp (Guanosine tetraphosphate)

pppGpp (Guanosine pentaphosphate)

both ppGpp and pppGpp

either ppGpp or pppGpp

Which one of the following DOES NOT belong to the domain of Bacteria?

Cyanobacteria

Proteobacteria

Bacteroids

Methanobacterium

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