Practice Questions

TLS Online TPP Program

#Question id: 180

Which of the following statements about aromatic amino acids is correct?

#XL - T Zoology

All are strongly hydrophilic.
Histidine’s ring structure results in its being categorized as aromatic or basic, depending on pH.
On a molar basis, tryptophan absorbs more ultraviolet light than tyrosine.
The major contribution to the characteristic absorption of light at 280 nm by proteins is the phenylalanine R group.

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TLS Online TPP Program

#Question id: 2074

#XL - S Microbiology

In some cells, there are many ion electrochemical gradients across the plasma membrane even though there are usually only one or two proton pumps present in the membrane. The gradients of the other ions are most likely accounted for by:

TLS Online TPP Program

#Question id: 299

#XL - Q Biochemistry

Which bond acts like a bridge two molecules formed by a covalent bond?

TLS Online TPP Program

#Question id: 27231

#XL - T Zoology

How many base pairs are there in every helical turn of Watson-Crick double helix model?

TLS Online TPP Program

#Question id: 1592

#XL - S Microbiology

Which of these molecules is incorrectly paired with a source?