1) Write the molecule or class of molecules described by each clue. If the clue

Question

1) Write the molecule or class of molecules described by each clue. If the clue describes more than one (type of) molecule, give an example of a molecule or class of molecules described by the clue (1 point each)

a) Molecule that is the (after editing and/or splicing) the ultimate product of transcription and is translated by the ribosome

b) A common second messenger for signals received by G-Protein Linked Receptors

c) Nucleic acid base (nucleobase) present in RNA but not DNA in part due to its likelihood of tautomerization

d) An amino acid residue likely to be found at the edge of a membrane spanning helix as well as to be involved in binding with galactose residues in oligosaccharides

e) Another amino acid residue likely to be found at the edge of a membrane spanning helix – this one has a phenolic side chain

f) Constitutes the bulk of the ribosome, including the active site catalyzing peptide bond synthesis

g) Aldopentose: in its representation by a Fischer projection, all the hydroxyl groups point right

h) Hetero-polysaccharide whose high negative charge density increases the affinity of anti-thrombin (which it binds) to the positively charged thrombin molecule

i) Extended (substituted) poly-saccharide chain with structure reminiscent of a protein b-strand; as in fibrous proteins like silk fibroin, the strands form rolled sheets

j) A D-ketohexose that famously is levorotary

Explanation / Answer

a) Messenger RNA

b) cyclic AMP

c) Uracil is present in RNA and not in DNA. Instead of Uracil, DNA utilizes Thymine.

d) asparagine (Asn) is the amino acid present at the edge of membrane spanning helix.

e) Tyrosine

f) ribozyme

g) D-ribose

h) Glycosaminoglycans is a hetero polysaccharide with highest net negative charge. Heparin is a glycosaminoglycan which acts as natural anticoagulant substance.

i) Chitin

j) Fructose

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