Practice Questions

TLS Online TPP Program

#Question id: 4165

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

#SCPH28 | Zoology

Proofreading is accomplished as an amino acid enters the active site of the enzyme. Incorrect amino acids are rejected before any reaction occurs.
Proofreading occurs just after aminoacyl-adenylate formation.
A separate cytosolic proofreading enzyme catalyzes the hydrolysis of incorrect aminoacyl-tRNAs.
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: 359

#SCPH06 I Botany

What is the concentration of OH− in a solution with an H+ concentration of 1.3 × 10^−4 M?

TLS Online TPP Program

#Question id: 4742

#SCPH06 I Botany

In birds, sex is determined by a ZW chromosome scheme. Males are ZZ and females are ZW. A recessive lethal allele that causes death of the embryo is sometimes present on the Z chromosome in pigeons. What would be the sex ratio in the offspring of a cross between a male that is heterozygous for the lethal allele and a normal female?

TLS Online TPP Program

#Question id: 15195

#SCPH06 I Botany

In the following pedigree shows the segregation of two different recessive traits.

Assuming that both traits are due to linked autosomal genes that are 10 cM apart, calculate the probability that the indicated child will have both recessive traits.

TLS Online TPP Program

#Question id: 2708

#SCPH05 I Biotechnology

In strong acid and at elevated temperatures, for example perchloric acid (HClO4) at more than 100° C, nucleic acids tend to:

TLS Online TPP Program

#Question id: 15141

#SCPH05 I Biotechnology