1. The organic compounds that function in building plasma membrane: a. nucleic a

Question

1. The organic compounds that function in building plasma membrane:

a. nucleic acids

b. carbohydrates

c. salts

d. lipids

e. proteins

2. Which of the following solutions is the weakest base:

a. a solution with a pH of 2.4

b. a solution with a pH of 5.2

c. a solution with a pH of 6.4

d. a solution with a pH of 8.6

e. a solution with a pH of 10.1

3. In the chemical reaction, HCl + NaOH ---> H2O +NaCl, the chemial HCl is considered to be:

a. water

b. base

c. product

d. acid

e. salt

4. Isotopes have different numbers of _____; thus they also have different _____.

a. protons; atomic numbers

b. neutrons; atomic masses

c. electrons; atomic numbers

d. protons; atomic masses

e. neutrons; atomic numbers

5. One major function of Ca+2 is to

a. serve as a salt in bones and teeth

b. it maintains the resting membrane potential

c. make functional thyroid hormones

d. influence the pH of body fluids

e. exist as the most abundant extracellular cation

Explanation / Answer

1. d. lipids

Explanation: Plasma membrane is constituted of lipid bilayer. There are two such layers. The phospholipids have a head and a tail region.

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