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.

Biology & Microbiology

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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.

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology

Which ion channel is responsible for the rising phase of the action potential, and why?

What will be an ideal response?

Biology & Microbiology