Quiz #7

You want to experiment with microbial growth in various nutrients, so you inoculate a loopful of E. coli into a tube of honey. Which statement best describes what you expect to happen and why?

E. coli does not grow because it has been dehydrated by the honey.

Which compound has the highest concentration in a cell?

H20

An organism that uses CO2 for its carbon needs and sunlight for its energy needs would be called a ______.

Photoauotrophs

The movement of substances from lower to higher concentration across a semipermeable membrane via a specific protein carrier and cell expenditure of energy is called ______.

active transport

An organism that can use gaseous oxygen in metabolism and has the enzymes to process toxic oxygen products is a(n) ____

aerobe

Which of the following is not a major element of a microbial cell?

copper

The movement of molecules from an area of high concentration to an area of lower concentration is called ______.

diffusion

Most of the dry weight of a microbial cell is from ______.

organic compounds

Organisms that feed on dead organisms for nutrients are called ______.

saprobes

Many lakes in the United States are suffering from periodic algae blooms, which can be thought of as an infection of the lake. Although the algae are naturally-occurring in the lake, when adjacent farm fields are over-fertilized with diammonium phosphate, the run-off deposits these nutrients in the lake, allowing the algae to grow without limit. Which of the following statements is incorrect regarding the overgrowth of algae?

the algae are heterotrophs