What is a frustule?
a. The by-product of photosynthesis in diatoms
b. The rigid cell wall of a diatom
c. A microscopic phage that attacks diatoms
d. A small appendage on a cyanobacteria
ANS: B
The frustule of a diatom is mostly made of silica which gives it characteristics like glass. It consists of
two valves or matched halves with perforations in it. Information can be found in the section Most
Phytoplankton are Photosynthetic Autotrophs
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The two types of geologic age dates are ____________________ and ____________________. Fill in the blank(s) with the appropriate word(s)
The present international treaty regarding Antarctica
A. prohibits radioactive-waste disposal, weapons testing, and military related activities on the continent. B. divides the land among the twelve nations claiming rights to it. C. allocates petroleum and mineral rights among the twelve original treaty signers and eleven other nations. D. All of the choices are correct.
How many electrons are associated with a single bond?
A) 1 B) 2 C) 4 D) 6
The smallest of the planets in our solar system is Pluto
Indicate whether this statement is true or false.