TLS Online TPP Program

#Question id: 9182


Imagine that a deep temperate zone lake did not turn over during the spring and fall seasons. Based on the physical and biological properties of limnetic ecosystems, what would be the difference from normal seasonal turnover?

#Unit 9. Diversity of Life Forms
  1. The lake would fail to freeze over in winter.
  2. An algal bloom of algae would result every spring.
  3.  Lakes would suffer a nutrient depletion in surface layers.
  4. The pH of the lake would become increasingly alkaline.
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TLS Online TPP Program

#Question id: 28692

#Unit 2. Cellular Organization

Which one of the following statements about signal recognition particles (SRPs) is correct?
a) It is a cytosolic ribonucleoprotein
b) It docks with a receptor on the surface of the ER membrane.
c) It is an integral membrane protein
d) It transiently binds to both the ER signal sequence at the C-terminus and the large (60S) ribosomal subunit
e) It acts as a scaffold for the hexamer

TLS Online TPP Program

#Question id: 28693

#Unit 2. Cellular Organization

There are some given statements about co-translational translocation in endoplasmic reticulum

a)SRP and the nascent polypeptide chain–ribosome complex bind to the integral membrane translocon

b)SRP and the nascent polypeptide chain–ribosome complex is strengthened by the binding of GTP to both the SRP and its receptor.

c)ER signal sequence emerges from the ribosome, it is bound by a signal recognition particle (SRP)

d)Hydrolysis of the bound GTP accompanies disassembly of the SRP and SRP receptor

e)Hydrolysis of the bound GTP initiates opening of the translocon, where translocation can take place


Which of the following statement is incorrect?

TLS Online TPP Program

#Question id: 28694

#Unit 2. Cellular Organization

Which one of the following was first identified through mutations in the yeast gene and encoding a protein called Sec61α?

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)