Why are the proteins being separated on an SDS polyacrylamide gel attracted equally to the positive electrode?

a) they all have the same degree of hydrophobicity
b) they carry a relatively uniform negative charge distribution
c) they are all the same molecular weight
d) they are all the same size
e) they carry a relatively uniform positive charge distribution


Ans: b) they carry a relatively uniform negative charge distribution

Biology & Microbiology

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Sodium concentrations are higher outside and glucose concentrations are higher inside the cell. Using the same membrane protein for Na+ and glucose transport, what is it called when a Na+ electrochemical gradient is used to drive glucose transport into the cell against its concentration gradient?

A. primary active transport B. secondary active transport C. primary facilitated diffusion D. secondary facilitated diffusion E. passive diffusion

Biology & Microbiology

Waxy coatings, such as those found on skin, hair, and feathers of some animals and the cuticle of some plants, are

commonly used by living organisms for protection against water loss and for lubrication. Such waxes are considered to be a type of ____.

a. triglyceride b. steroid c. neutral lipid d. phospholipid

e. fatty acid

Biology & Microbiology

Which of the following is NOT a primary taste

sensation?

a. sweet b. sour c. bitter d. umami e. all of these are primary taste sensations

Biology & Microbiology

A term often used to describe an organism that is a genetic mosaic, resulting from the introduction of DNA from another organism, is ________

Fill in the blank(s) with correct word

Biology & Microbiology