Practice free Biomolecules (Zoology) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Two free ribonuleotide units are interlinked with [1995]
Two free ribonucleotide units are linked together by a phosphodiester bond. This bond is formed by the condensation reaction between the 5' phosphate group of one nucleotide and the 3' hydroxyl group of another nucleotide, with the elimination of a water molecule.
Genes are packaged into a bacterial chromosome by [1997]
(b) Bacteria are prokaryotic organisms. They possess a double stranded DNA molecule as it's genetic material. Polyamines like spermidine and cadaverine (instead of histones) are associated with DNA packaging in bacteria.
In which of the following groups, all the three are examples of polysaccharides? [1996]
(a) Starch and glycogen are storage polysaccharide and cellulose is a structural polysaccharide. Starch has straight chain of 1,4 -D pyranose glucose units and side chains or amylopectin part of 2-200 thousand glucose units that are attached to straight chains by 1,6 -D glycosidic bonds.
Glycogen is a long chain branched polymer of 5-300 thousand glucose units, straight chain linked by -D 1-4 glycosidic bonds and side chains through -D 16 glycosidic bonds.
Cellulose, a fibrous polysaccharide has a linear chain of 6-10 thousand 14 linked -pyranose glucose chain.
Km value is dependent upon
Km is the concentration of substrate which permits the enzyme to achieve half Vmax. An enzyme with a high Km has a low affinity for its substrate, and requires a greater concentration of substrate to achieve Vmax.
Most abundant organic compound on earth is [2001,2004]
(b) Cellulose is fibrous polysaccharide that forms the structural component of plant cell wall, some primitive fungi and tunic of ascidians. Cellulose is the most abundant organic substance on earth. It can be digested by only a few microbes present in the gut of ruminants and white ants.
Identify the amino acid with hydroxymethyl as its R group:
Answer 3. Read page 144, XI NCERT
All the following are nucleosides except:
Answer 2. Read page 144, XI NCERT
Identify the incorrect statement regarding the structure of proteins:
Answer 3. Reas page 150, XI NCERT
The substrate has to go through a much higher energy state or transition state in case of:
Answer 3. Read page 156, XI NCERT
Name the enzymes that catalyze removal of groups from substrates by mechanism other than hydrolysis leaving double bonds:
Answer 2. Read page 158, XI NCERT
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