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Stephen G.
Medical Student--Texas Tech Health Sciences Center School of Medicine
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Biochemistry
TutorMe
Question:

Where is keratinized stratified squamous epithelium located?

Stephen G.
Answer:

Keratinized stratified squamous epithelium is located in the epidermis.

Biology
TutorMe
Question:

A. Phosphorylation cascades are caused by what type of enzyme? B. What are phosphorylation cascades used for?

Stephen G.
Answer:

A. Protein Kinases B. Signal amplification in signal transduction pathways in the cell.

Anatomy
TutorMe
Question:

Animals (including humans) can develop cancer if a cell in their body accumulates mutations in their DNA. A particularly vulnerable time for the DNA is during the S phase of the cell cycle when the cell is replicating it's genome. What is a mechanism that the cell utilizes during replication to prevent mutations that can lead to cancer?

Stephen G.
Answer:

The proofreading function of DNA Polymerase prevents mutation during DNA replication. The proofreading function of DNA Polymerase makes the mutation rate during DNA replication as low as 1 in 1 billion base pairs. For a comparison, Bacterial DNA Polymerase does not have a proofreading function, and have a mutation rate 10,000 times higher than that of animal cells.

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