During which state of the cell cycle would a cell contain the least total amount of DNA? What will be an ideal response?
In the G1 stage, each chromosome exists as a single copy - it is unreplicated. During the S stage the
chromosomes replicate so there is not twice as much DNA present. Not until the end of telophase (and
after cytokinesis) will this situation revert.
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The dose of an antigen that kills 50% of animals in a test group and is used to estimate the virulence of a pathogen is known as
A) Antigen dose50. B) Virulence-50. C) LD50 (lethal dose50). D) Death rate-50.
Why are some mutations of Ras associated with cancer?
A. Ras binds to growth factor receptors. B. Ras is a type of G protein. C. Ras is part of the MAP kinase signal transduction pathway. D. Ras alters gene expression.
Calculate the pKa of lactic acid, given that when the concentration of lactic acid is 0.01 M and the concentration of lactate is 0.002 M, the pH is 2.9
A. 3.9 B. 3.6 C. 3.2 D. 2.5 E. 2.2
Which ion channel is responsible for the rising phase of the action potential, and why?
What will be an ideal response?