GEMS Exam 1 Review

Homeostasis refers to ____.​

• a. the ability of a cell to reproduce​
• b. ​directions the cell receives from DNA
• c. ​the maintenance of a constant internal state
• d. ​the extraction of energy from nutrients
• e. ​the ability of organisms to move within their environments

In terms of classification humans belong to which domain?​

• a. ​prokaryote
• b. ​Eukarya
• c. ​Archaea
• d. ​Bacteria
• e. ​protists

Which form of organization is classified between cell and organ?​

• a. ​atom
• b. ​molecule
• c. ​compound
• d. ​organelle
• e. ​tissue

Energy flows into the biosphere from ____.​

• a. ​water
• b. ​raw materials
• c. ​decomposition
• d. ​ecosystems
• e. ​the sun

In science, the word "theory" ____.​

• a. is an explanation that has not been published​
• b. ​has essentially the same meaning as a prediction
• c. ​is based mostly on opinions
• d. ​signifies that a hypothesis has been tested and proven over a period of time
• e. ​means that a scientist has a hunch something is true

A pure substance that cannot be broken down into another substance is known as a(n) ____.

• a. ​proton
• b. ​electron
• c. ​compound
• d. ​element
• e. ​isotope

​Which element is not one of the four most common elements found in organisms?

• a. ​hydrogen
• b. ​oxygen
• c. ​carbon
• d. ​helium
• e. ​nitrogen

​Which statement is true of electron shells?

• a. ​The innermost shell can hold up to two electrons.
• b. ​The innermost shell is at the highest energy level.
• c. ​A shell can hold up 20 electrons.
• d. ​Larger atoms have less electron shells.
• e. ​A second shell with six electrons is completely filled.

When an atom's outer electron shell is filled the atom is ____.

• a. ​unstable
• b. ​positively charged
• c. ​polarized
• d. ​most stable
• e. ​isotope

The bonding of two or more atoms creates a(n) ____.

• a. ​molecule
• b. ​ion
• c. ​isotope
• d. ​mixture
• e. ​solution