a. Describe the kinase cascade that transmits signals down from the activated Ras protein.

b. Platelet derived growth factor (PDGF) is a dimer of two polypeptide chains. How would PDGF monomers affect signaling by the PDGF receptor?

1) What is hearing?

2) What is the pathway for hearing?

3) What are the two vestibular systems?

4) Explain how the two vestibular systems detect changes in movement.

What is a cortical reaction? What is the mechanism for slow block to prevent polyspermy? What would be the consequences if calcium release from smooth endoplasmic reticulum is blocked?

What is lymphedema and what causes it? What are its symptoms and possible consequences?

What is the role of connective tissue in the heart – what does it do? What is its impact on conduction? Contraction?

The hormones secretin and cholecystokinin which are released by duodenal enteroendocrine cells will have what overall action?

1) Functions of the large intestine include :

Temporary food storage

resorption of water and compaction of feces

chemical digestion of chyme

absorption of the products of digestion

all the above

2) what does Benedict's reagent test for when analyzing amylase activity?

presence of amino acids

enzymatic activity of proteinases

hydrolysis of glucose

presence of simple sugars

3) Which of the following is NOT a basic process of the gastrointestinal system?

Filtration

absorption

digestion

secretion

motility

4) what cell produces pepsinogen?

duodenal cell

acinar cell

beta cell

chief cell

5) what does biuret reagent test for when analyzing pepsin activity?

hydrolysis of nucleic acid

presence of alcohol sugars

products of lipase

hydrolysis of proteins

Please help me answer this question

Can males develop pelvic inflammatory disease when infected by an STD? Why or why not?

1. Describe the cardiac cycle in more detail. Include valve actions and the forces that cause those valve actions.