61.

Which of these statements is incorrect?

• Enzymes of TCA cycle are present in mitochondrial matrix

• Glycolysis occurs in cytosol

• Oxidative phosphorylation takes place in outer mitochondrial membrane

• Glycolysis operates as long as it is supplied with NAD that can pick up hydrogen atoms

Many ribosomes may associate with a single mRNA to form multiple copies of a polypeptide simultaneously. Such strings of ribosomes are termed as

• Polysome

• Polyhedral bodies

• Nucleosome

• Plastidome

Double fertilization is

• Fusion of two male gametes of a pollen tube with two different eggs

• Fusion of one male gamete with two polar nuclei

• Syngamy and triple fusion

• Fusion of two male gametes with one egg

Pollen grains can be stored for several years in liquid nitrogen having a temperature of

• –120°C

• –80°C

• –160°C

• –196°C

Which among the following is not a prokaryote?

• Saccharomyces

• Mycobacterium

• Oscillatoria

• Nostoc

The two functional groups characteristic of sugars are

• Hydroxyl and methyl

• Carbonyl and methyl

• Carbonyl and hydroxyl

• Carbonyl and phosphate

Which of the following is true for nucleolus?

• Larger nucleoli are present in dividing cells

• It is a membrane-bound structure

• It is a site for active ribosomal RNA synthesis

• It takes part in spindle formation

The stage during which separation of the paired homologous chromosomes begins is

• Pachytene

• Diplotene

• Zygotene

• Diakinesis

Which of the following is commonly used as a vector for introducing a DNA fragment in human lymphocytes?

• Retrovirus

• Ti plasmid

• pBR 322

• λ phage

Use of bioresources by multinational companies and organisations without authorisation from the concerned country and its people is called

• Bio-infringement

• Biopiracy

• Bioexploitation

• Biodegradation