Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 10859
TLS Online TPP Program

#Question id: 191

The role of zinc in the mechanisms of carbonic anhydrase is to

#Section 2: General Biology

  1. maintain the configuration of the holoenzyme.

  2. bind to three histidine residues.

  3. produce a nucleophilic attack on the substrate.

  4. promote ionization of bound water.

More Questions
TLS Online TPP Program

#Question id: 3261

#Section 3: Genetics, Cellular and Molecular Biology

A parent population (P) is change into daughter populations (Q) which grow in habitats. After 1000 generations, the equilibrium frequency distribution of of the daughter populations is shown in the figure below. For reference, the vertical line represents the mean of the parent population. Which type of natural selection?
TLS Online TPP Program

#Question id: 3780

#Section 3: Genetics, Cellular and Molecular Biology

If a cell were unable to produce histone proteins, which of the following results would be a likely effect on the cell?
TLS Online TPP Program

#Question id: 14785

#Section 1: Engineering Mathematics

Three machines A, B and C produce identical items of their respective output 5%, 4% and 3% items are faulty. If A produces 25% of the total output, B produces 30% and C the remainder and an item selected at random is found to be faulty, what is the probability that it was produced by machine C?
TLS Online TPP Program

#Question id: 3566

#Section 3: Genetics, Cellular and Molecular Biology

Two organisms, with genotypes BbDD and BBDd, are mated. Assuming independent assortment of the B/b and D/d genes, determine the genotypic ratios in offspring that would occur.
TLS Online TPP Program

#Question id: 3808

#Section 3: Genetics, Cellular and Molecular Biology

Fibroblast cells from several different xeroderma pigmentosa patients were cultured, then fused in intergenic complementation studies. Which cell fusions would not result in a hybrid capable of repairing damaged DNA?