ENV110: Chapter 2 Quiz

If acid precipitation rain changes the pH of a pond from 7.5 to 5.5, the level of hydrogen ion has changed by a factor of ________.

• A.) 2.0

• B.) 4.0

• C.) 13.0

• D.) 100

• E.) 0.01

If the pond above is chemically treated to raise the pH to 7.0 ________.

• A.) The water of the pond is now slightly acid

• B.) The water of the pond is now slightly alkaline

• c.) The concentration of hydrogen ion is now lower than at pH 7.5

• D.) There will be no measurable levels of hydrogen ion in the pond

• E.) The pond is now pH neutral and is has more hydrogen ions that at pH 7.5

3.) The figure suggests that most biological pH values (are) ________.

• A) in the extremely acid range

• B) in the extremely alkaline range

• C) close to pH neutrality

• D) indicate an absence of hydrogen ions

• E) indicate an absence of hydroxide ions

4.) The pH of stomach acid suggests that it ________.

• A) would be harmful to living organisms ingested with food

• B) has a very high concentration of hydroxide ions

• C) is well inside the biological range of pH values

• D) is an excellent environment for bacteria and fungi to multiply

• E) must be very close to the pH of other body fluids

1) ________ is defined as the number of protons plus the number of neutrons.

• A) Mass number

• B) Ionic number

• C) Atomic number

• D) Isotopic number

• E) Nuclear number

2) ________ are composed of amino acids

• A) Proteins

• B) Nucleic acids

• C) Carbohydrates

• D) Lipids

• E) Bases

3) ________ are the primary water‑insoluble components of cell membranes

• A) Proteins

• B) Nucleic acids

• C) Carbohydrates

• D) Acids

• E) Lipids

4) Geographic Information Systems (GIS) is ________.

• A) useful in determining the number of heterotrophs in an ecosystem

• B) helping conservation biologists study habitats and study biodiversity

• C) useful in tracking the movements of individual organisms

• D) used to predict rainfall and temperature changes in ecosystems

• E) used to measure the economic value of ecosystem services

5) An example of a positive feedback loop ________.

• A) a pond becoming more acidic as a result of pollution

• B) melting arctic snow exposing dark surfaces that heat up and cause further melting

• C) predators eating most of their prey and then declining in umbers

• D) a thermostat turning on the furnace as temperature drops

• E) birds migrating south in response to colder temperatures

6) Which of the following represents an example of aerobic cellular respiration?

• A) water + carbon dioxide + energy → glucose + oxygen + water

• B) glucose + oxygen → water + carbon dioxide + energy

• C) water + carbon dioxide → glucose + oxygen + water + energy

• D) nitrogen + carbon dioxide + energy → methane + oxygen

• E) nitrogen + oxygen + glucose → methane + carbon dioxide