Practice Questions

TLS Online TPP Program

#Question id: 9605

A phylogenetic tree that is ʺrootedʺ is one

#XL - S Microbiology

that extends back to the origin of life on Earth.
at whose base is located the common ancestor of all taxa depicted on that tree.
that illustrates the rampant gene swapping that occurred early in lifeʹs history.
that indicates our uncertainty about the evolutionary relationships of the taxa depicted on the tree.

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TLS Online TPP Program

#Question id: 941

#XL - Q Biochemistry

Which of the following is an amide-containing amino acid?

TLS Online TPP Program

#Question id: 941

#XL - P Chemistry

Which of the following is an amide-containing amino acid?

TLS Online TPP Program

#Question id: 942

#XL - Q Biochemistry

a-ketoglutarate is a precursor for each of the following, except

TLS Online TPP Program

#Question id: 942

#XL - P Chemistry

a-ketoglutarate is a precursor for each of the following, except

TLS Online TPP Program

#Question id: 943

#XL - Q Biochemistry

An amino acid formed by transamination of a citric acid cycle intermediate is ________.

TLS Online TPP Program

#Question id: 944

#XL - Q Biochemistry

Because they lack aspartate kinase and aspartate semialdehyde dehydrogenase, ________ cannot synthesize lysine, methionine or threonine.