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TLS Online TPP Program

#Question id: 10285

Some of the statements given shows the activity of PFK-1 and PFK-2, which of the following statements incorrectly shown these enzyme activity?

#XL - Q Biochemistry
  1. Fructose 2,6-bisphosphate is formed by phosphorylation of fructose 6-phosphate, catalyzed by phosphofructokinase-2 (PFK-2), and is broken down by fructose 2,6-bisphosphatase (FBPase-2)
  2. fructose 2,6-bisphosphate is an allosteric activator of PFK-1 activity
  3. PFK-1 is virtually inactive in the absence of fructose2,6-bisphosphate, fructose 2,6-bisphosphate has the opposite effect on FBPase-1: it reduces its affinity for its substrate, thereby slowing gluconeogenesis

  4. cAMP-dependent protein kinase, which transfers a phosphoryl group from ATP to the bifunctional protein PFK-1/FBPase-1. Phosphorylation of this protein enhances its FBPase-1 activity and inhibits its PFK-1 activity

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TLS Online TPP Program

#Question id: 9277

#XL - R Botany

The light energy absorbed by the carotenoids is transferred to chlorophyll for photosynthesis; because of this role they are called
TLS Online TPP Program

#Question id: 1613

#XL - S Microbiology

Complement component C3 is cleaved by:
TLS Online TPP Program

#Question id: 5748

#XL - S Microbiology

When a diploid organism undergoes one or more rounds of endoreduplication (resulting in a gain of more than one complete haploid set of chromosomes), the resulting cells are best described as
TLS Online TPP Program

#Question id: 8294

#XL - S Microbiology

The common ancestors of birds and mammals were very early (stem) reptiles, which almost certainly possessed three-chambered hearts (two atria, one ventricle). Birds and mammals, however, are alike in having four-chambered hearts (two atria, two ventricles). The fourchambered hearts of birds and mammals are best described as ________.
TLS Online TPP Program

#Question id: 1085

#XL - Q Biochemistry

Which of the following statements about a G protein signaling pathway is true?