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TLS Online TPP Program

#Question id: 12462

For most terrestrial ecosystems, pyramids of numbers, biomass, and energy are essentially the same-they have a broad base and a narrow top. The primary reason for this pattern is that

#Unit 10. Ecological Principles
  1. Secondary consumers and top carnivores require less energy than producers.
  2. At each step, energy is lost from the system as a result of keeping the organisms alive. 
  3. As matter passes through ecosystems, some of it is lost to the environment.
  4. Biomagnification of toxic materials limits the secondary consumers and top carnivores.
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TLS Online TPP Program

#Question id: 28695

#Unit 2. Cellular Organization

O-linked oligosaccharides is representing the attachment of glycoproteins to the hydroxyl (–OH) group in which amino acid residue?
TLS Online TPP Program

#Question id: 28696

#Unit 2. Cellular Organization

N-linked oligosaccharide is attaching carbohydrate chain to the amide nitrogen of which amino acid residue?
TLS Online TPP Program

#Question id: 28697

#Unit 2. Cellular Organization

Biosynthesis of all N-linked oligosaccharides begins in the rough ER with a preformed branched oligosaccharide precursor containing_____
i) Glucose (Glc)
ii) Galactose
iii) Mannose (Man)
iv) N-acetylglucosamine (GlcNAc)
v) N-acetylgalactosamine (GalNAc)
TLS Online TPP Program

#Question id: 28698

#Unit 2. Cellular Organization

the oligosaccharide precursor is assembled on a membrane- attached anchor called dolichol phosphate, which is___
TLS Online TPP Program

#Question id: 28699

#Unit 2. Cellular Organization

First sugar residue is attached to dolichol by ___
TLS Online TPP Program

#Question id: 28700

#Unit 2. Cellular Organization

Biosynthesis of all N-linked oligosaccharides begins in the rough ER with a preformed branched oligosaccharide precursor Glc3Man9(GlcNAc)2, Which of the following statements is incorrect about these biosynthesis?
a) the oligosaccharide precursor is assembled on a membrane- attached anchor called dolichol phosphate
b) First sugar residue is attached to dolichol by a glycosidic bonds & the other
sugars are added by high-energy pyrophosphate
c) Two N- acetylglucosamine (GlcNAc) and five mannose residues are added one at a time to a dolichol phosphate on the lumen
d) Four mannose and three glucose  residue are added one to a dolichol phosphate on the luminal side