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TLS Online TPP Program

#Question id: 796

Which statement best describes the distinction between the purposes of the two RNAi pathways within the eukaryotic cell?

#Unit 1. Molecules and their Interaction Relevant to Biology

  1. miRNA-mediated gene silencing represents a back-up pathway should siRNA-mediated gene silencing be unsuccessful at silencing the target dsRNA

  2. siRNA and miRNA-mediated gene silencing pathways must both be active to successfully silence the target dsRNA

  3. miRNA and siRNA-mediated gene silencing represent evolutionary-independent pathways which confer identical silencing mechanisms on the target dsRNA

  4. siRNA-mediated gene silencing represents a cell defence mechanism against exogenous dsRNA; miRNA-mediated gene silencing is an integral gene expression regulation process

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TLS Online TPP Program

#Question id: 11792

#Unit 1. Molecules and their Interaction Relevant to Biology

Hyaluronic acid is an important glycosaminoglycan component of connective tissue. Hyaluronate molecules are composed of
A. D-glucuronic acid and N-acetyl-D-glucosamine
B. D-galactose and N-acetyl-D-glucosamine
C. β(1→4) and β(1→3) alternate linkages
D. β(1→4) and β(1→6) alternate linkages
Which of the above 2 combinations are correct
TLS Online TPP Program

#Question id: 11793

#Unit 1. Molecules and their Interaction Relevant to Biology

On the proteoglycan the glycosaminoglycan chain can bind to extracellular proteins through
TLS Online TPP Program

#Question id: 11794

#Unit 1. Molecules and their Interaction Relevant to Biology

Glypicans are derivatives of
TLS Online TPP Program

#Question id: 11795

#Unit 1. Molecules and their Interaction Relevant to Biology

_________ residue in a tetrasaccharide linker connects a glycosaminoglycan such as chondroitin 4-sulfate to _______ residue in the core protein. The residue at the reducing end of the linker is joined by its anomeric carbon to the hydroxyl of this residue.
TLS Online TPP Program

#Question id: 11796

#Unit 7. System Physiology – Animal

Which of the following hormones is largely unbound to plasma proteins?
TLS Online TPP Program

#Question id: 11797

#Unit 6. System Physiology – Plant

A living cytoplasmic connection penetrate the walls between sieve tube elements and their companion cells; which are often complex and branched on the companion cell side, known as