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TLS Online TPP Program

#Question id: 4132

In E. coli, aminoacyl-tRNA synthetases:

#Unit 3. Fundamental Processes

  1. activate amino acids in 12 steps

  2. are amino acid–specific; there is at least one enzyme specific for each amino acid.

  3. fall into two classes, each of which attaches amino acids to different ends of the tRNA.

  4. have no proofreading activities.

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TLS Online TPP Program

#Question id: 4054

#Unit 3. Fundamental Processes

Phosphorylation of RNA Pol II results in the formation
TLS Online TPP Program

#Question id: 32579

#Unit 2. Cellular Organization

In many cells, the minus ends of microtubules are stabilized by association with:
a. Capping proteins
b. Kinesin-13
c. Dynein
d. γ-TuRC
TLS Online TPP Program

#Question id: 4542

#Unit 3. Fundamental Processes

Repression of the GAL1 gene in yeast by Mig1, in the presence of glucose follows those steps;

I- Deacetylation of local nucleosomes

II-Recruiting the Tup1 repressing complex

III- Mig1 represses expression of GAL1

IV- Mig1 binds a site between the UASG and the GAL1 promoter
TLS Online TPP Program

#Question id: 29505

#Unit 6. System Physiology – Plant

Cicutoxin is produced by plant as constitutive chemical defenses which is
a. Produced by Hemlock (Cicuta sp.) 
b. Is  a polyacetylene
c. Involved in repolarization of neuronal action potentials
d. Involved in the suspension of all muscular activity

Which of the following is true regarding Cicutoxin
TLS Online TPP Program

#Question id: 5057

#Unit 5. Developmental Biology

The major factor which is important in providing the competence for the ectoderm to respond to the inducers from the optic cup-