TLS Online TPP Program

#Question id: 678


Which is not true about β-sheets?

#SCPH05 I Biotechnology
  1. The side-chains of all amino acids point to the same side of the sheet.

  2. The polypeptide chains in the sheet are nearly fully extended.

  3. The range of allowed phi and psi angles is broader than for those in the α-helix.

  4. In antiparallel sheets the hydrogen bonds between adjacent strands are nearly perpendicular to the backbones of the strands.

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TLS Online TPP Program

#Question id: 8924

#SCPH05 I Biotechnology

Fossil evidence indicates that the following events occurred in what sequence, from earliest to most recent?
1. Protostomes invade terrestrial environments.
2. Cambrian explosion occurs.
3. Deuterostomes invade terrestrial environments.
4. Vertebrates become top predators in the seas.

TLS Online TPP Program

#Question id: 10286

#I Life Science/ Life Sciences Group – I-V

The enzyme aldolase, catalyzes a reversible aldol condensation, Fructose 1,6-bisphosphate is cleaved to yield two different triose phosphates, glyceraldehyde 3-phosphate, an aldose, and dihydroxyacetone phosphate, a ketose. There are two classes of aldolases such as;

A) Class I aldolases

B) Class II aldolases

i) Found in animals and plants

ii) Found in in fungi and bacteria

iii) formation of protonated Schiff base on enzyme and its active site contain lysine residue

iv) do not form the Schiff base intermediate and a zinc ion at the active site is coordinated with the carbonyl oxygen at C-2

In which of the following option is the given enzyme with its correct statements?

TLS Online TPP Program

#Question id: 8293

#SCPH28 | Zoology

The importance of computers and of computer software to modern systematics s is most closely linked to advances in ________.

TLS Online TPP Program

#Question id: 4584

#SCPH06 I Botany

When Cuvier considered the fossils found in the vicinity of Paris, he concluded that the extinction of species ________.

TLS Online TPP Program

#Question id: 12571

#SCPH06 I Botany

Although extinction is a natural process, current extinctions are of concern to environmentalists because