Molecular Biology Answers

1. Which of the following is an accurate negative result for a simple analytical reaction for bio-molecules?

A. starch reaction: dark blue-black solution


B. peptide bond reaction: purple solution


C. reducing sugar reaction: orange precipitate


D. lipid: a single, red fraction (layer)


E. None of the above is correct.

1. The mechanism of the benedict reaction is

A. coordination of copper with electrons of amine nitrogens.


B. creation of two phases (hydrophilic and hydrophobic phases).


C. alignment of triiodine complex in structural cleft.


D. reduction of copper by electrons provided from free aldehyde sugars.


E. None of the above is correct.

Question 2
1. Which structure reacts with biuret reagent?

A. long aliphatic hydrocarbons


B. nitrogens of adjacent amino acids


C. pentose sugars of RNA monomers


D. terminal aldehyde groups of reducing sugars


E. None of the above is correct.

Discuss the role of two tumor suppressor genes and their role in the cell cycle and cancer

Discuss the role of biomarkers in population research

If at sea level water boils at 100 degrees Celsius while methane boils at -161 degrees Celcius which of these substances has a stronger force of attraction between its particles

A flower was fertilized by pollen grains having the Constitution (n-1) .if ovules are normal ,which of the following is applicable for the seeds so produced?
(A) allopoliploidy
(B) monosomy
(C) nullisomy
(D) both A and B

A mutant yeast strain is found with a mutation affecting a tRNASer. The wild type normally produces a tRNA that recognizes the codon 5’ UCA 3’ and is charged with the amino acid Serine (Ser) (its notation is tRNASer). The mutant’s tRNA is still charged with Ser, but its anticodon is mutated and now has the sequence 5’-UCA-3’. What effect will this have on translation in these yeast cells? How will the proteins produced be different?

A bacterium with completely non-radioactive DNA was allowed to replicate in a radioactive medium for three generation what % of the bacteria should contain radioactive DNA?