I use an affinity column to purify a protein, “X” from cell lysate. The specific activity of the protein is very low after this step. So I run the affinity-purified sample through an anion exchanger, and collect the early fraction. This eluate has very high specific activity. My results from […]

(a) L1 is a slide of a stained transverse section through a plant stem. This plant species is a native of Europe and parts of Asia. You are not expected to be familiar with this specimen. (b) Draw a large plan diagram of the quarter of the stem, as shown […]

5. Action potentials normally travel along an axon in either direction depending on the needs of the animal. )        True        False    Question 6.6. The thalamus relays information to the body.)        True        False    Question 7.7. The resting membrane allows much more potassium than sodium to diffuse across so that the concentration of potassium inside […]

In a hypothetical population’s gene pool, an autosomal gene, which had previously been fixed, undergoes a mutation that introduces a new allele, one inherited according to incomplete dominance. Natural selection then causes stabilizing selection at this locus. Consequently, what should happen over the course of many generations?a. The proportions of […]