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TLS Online TPP Program

#Question id: 368

Which of the following is true about the properties of aqueous solutions?

#Unit 1. Molecules and their Interaction Relevant to Biology

  1. A pH change from 5.0 to 6.0 reflects an increase in the hydroxide ion concentration (OH-) of 20%

  2. A pH change from 8.0 to 6.0 reflects an increase in the hydroxide ion concentration (OH-) by a factor of 100

  3. Hydrogen bonds form readily in aqueous solutions

  4. The pH can be calculated by adding 7 to the value of pOH

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TLS Online TPP Program

#Question id: 2118

#Unit 2. Cellular Organization

Which of the following statements correctly describes the normal tonicity conditions for typical plant and animal cells? The animal cell is in:
TLS Online TPP Program

#Question id: 2119

#Unit 2. Cellular Organization

A sodium-potassium pump:
TLS Online TPP Program

#Question id: 2120

#Unit 2. Cellular Organization

Which one of the following statements about membranes is true?
TLS Online TPP Program

#Question id: 2121

#Unit 2. Cellular Organization

Which of the following membrane activities requires energy from ATP hydrolysis?
TLS Online TPP Program

#Question id: 2122

#Unit 2. Cellular Organization

The inner (plasma) membrane of E. coli is about 75% lipid and 25% protein by weight.  How many molecules of membrane lipid are there for each molecule of protein?  (Assume that the average protein is Mr 50,000 and the average lipid is 750.)
TLS Online TPP Program

#Question id: 2123

#Unit 2. Cellular Organization

Which of these statements about the composition of membranes is true?