Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 52460
TLS Online TPP Program

#Question id: 4165

Which is true about proofreading activity during the synthesis of aminoacyl-tRNAs?

#SCPH01 Biochemistry

  1. Proofreading is accomplished as an amino acid enters the active site of the enzyme. Incorrect amino acids are rejected before any reaction occurs.

  2. Proofreading occurs just after aminoacyl-adenylate formation.

  3. A separate cytosolic proofreading enzyme catalyzes the hydrolysis of incorrect aminoacyl-tRNAs.

  4. No proofreading activity is necessary due to the high level of specificity of all aminoacyl-tRNA synthetases.

More Questions
TLS Online TPP Program

#Question id: 443

#SCPH06 I Botany

The free energy for ATP hydrolysis in vivo is actually greater than the standard free energy change of -30 kJ mol-1 because
TLS Online TPP Program

#Question id: 9150

#SCPH06 I Botany

For mountain ranges that are subjected to prevailing winds, why is the climate drier on the leeward (downwind) side?
TLS Online TPP Program

#Question id: 17207

#I Life Science/ Life Sciences Group – I-V

A novel protein from a deep sea archaebacterium was identified and sequenced. The sequence is expected to be widely divergent from known sequences. Which scoring matrix will produce the most appropriate alignment in a search for homologs in the NCBI database?
TLS Online TPP Program

#Question id: 1081

#SCPH01 Biochemistry

Which of the following is a type of local signaling in which a cell secretes a signal molecule that affects neighboring cells?
TLS Online TPP Program

#Question id: 9221

#SCPH06 I Botany

The primary difference between the small-population approach and the declining-population approach to biodiversity recovery is that ________.