Penn Foster Introduction to Biology
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____ are the smallest units of life. - Cells
Order of biological organization - Population, Community, Ecosystem,
Biosphere
A modification that makes organisms more suited to their environment is
called: - Adaptation
...
Order of biological organization - ✔✔Population, Community, Ecosystem,
Biosphere
A modification that makes organisms more suited to their environment is
called: - ✔✔Adaptation
The life domain whose members live in very harsh environments, such as
salt lakes and hot springs, is: - ✔✔Archaea
During a scientific experiment, the control group is: - ✔✔identical to the
experimental group in all areas except the variable being tested
The ___ is a subatomic particle that carries a positive electrical charge. -
✔✔Proton
,When an atom has two or more electron shells, the outer shell well be most
stable if it contains eight electrons. This concept is called the ___ -
✔✔Octet Rule
When two oxygen atoms join together, a ____ is formed. - ✔✔Molecule
The ____ bond is a type of atomic bond in which atoms share electrons to
produce a completed outer shell. - ✔✔Covalent
The polarity of water molecules causes them to be attracted to one another
by a ____ - ✔✔Hydrogen
As the number of hydrogen ions in a solution increases, the PH of the
solution: - ✔✔decreases
During winter only the upper surface of a lake freezes, which allows for life
to persist below the surface. Which of water's unique properties is
responsible for this phenomenon? - ✔✔Lower density as ice
The most abundant element by weight in the human body is: - ✔✔Oxygen
The polysaccharide structural carbohydrate most commonly used by living
things is: - ✔✔Cellulose
Which functional group is associated with fatty acids? - ✔✔Carboxyl
The hard body parts of insects and crabs are composed of a
polysaccharide called: - ✔✔Chitin
, Cell membranes are composed mainly of which type of lipids? -
✔✔Phospholipids
____ proteins are made of polypeptide chains folded into rounded compact
shapes. - ✔✔Globular
When joined by a dehydration reaction, the covalent bond between the
carboxyl groups of two amino acids is called a ____ bond. - ✔✔peptide
The sugar in RNA is: - ✔✔Ribose
Within cells, the synthesis of proteins occurs in the: - ✔✔Ribosomes
What is the main function of the mitochondria? - ✔✔Producing ATP
The ____ keeps the cytoplasm of eukaryotic cells seperate from the DNA. -
✔✔Nuclear envelope
Organelles that use solar energy to make carbohydrates are called: -
✔✔Chloroplasts
The ___ are sometimes called the "powerhouses" of the cell. -
✔✔Mitochondria
The cell-to-cell junctions that allow cells to communicate are called ___
junctions. - ✔✔gap
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