Q1. A rat tumour cell line proliferates rapidly in culture due to the fact that it expresses a high level of a constitutively activated Ras. You inject into these cells an antibody raised against guanine nucleotide exchange factor, SOS that blocks its binding to Drk. How will this influence the […]

I know the only difference between sickle-cell hemoglobin and normal hemoglobin is a single amino acid substitution, valine(Val)for glutamic acid (Glu). So the structural difference is with the”R goup” since the Amino group and Carboxl group are the same inboth Valine and Glutamic. Question I have to explain why this […]

Digestion is an important process in the human body. a) Identify and describe the digestive processes. b) Consider the mouth, stomach, small intestines and large intestines – identify the digestive enzymes that are present in these organs of the digestive system and identify the substances they digest. c) Include where […]

A population of sexually reproducing organisms with non-overlapping generations has two alleles: A1 and A2; p is the frequency of A1, q is the frequency of A2 (p+q=1). Allele A2 is recessive and lethal when in homozygous genotype (i.e. fitness of A2A2 is zero). Fitness of heterozygote is the same […]