Penn Foster Biology Test 1 Exam
Questions and Answers 100% Solved
_______ are the smallest units of life. - ✔✔Cells
Which one of the following lists shows the correct order of biological
organization? - ✔✔Population, community, ecosystem, biosphere
A modification that makes organisms more suited to their environment is
called a/an - ✔✔adaptation.
The life-domain whose members live in very harsh environments, such as
salt lakes and hot
springs, is called - ✔✔Archaea.
During a scientific experiment, the control group is - ✔✔identical to the
experimental group in all areas except the variable being tested.
The subatomic particle that carries a positive electrical charge is the -
✔✔proton.
When an atom has two or more outer electron shells, the outer shell will 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 type of bond in which atoms share electrons to produce a completed
outer shell is
a/an _______ bond. - ✔✔covalent
The polarity of water molecules causes them to be attracted to one another
in what's called
a _______ bond. - ✔✔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? - ✔✔Lower
density as ice
The most abundant element by weight in the human body is - ✔✔oxygen
Among living things, the most common polysaccharide structural
carbohydrate is - ✔✔cellulose
Which one of the following functional groups is associated with fatty acids?
- ✔✔Carboxyl
Questions and Answers 100% Solved
_______ are the smallest units of life. - ✔✔Cells
Which one of the following lists shows the correct order of biological
organization? - ✔✔Population, community, ecosystem, biosphere
A modification that makes organisms more suited to their environment is
called a/an - ✔✔adaptation.
The life-domain whose members live in very harsh environments, such as
salt lakes and hot
springs, is called - ✔✔Archaea.
During a scientific experiment, the control group is - ✔✔identical to the
experimental group in all areas except the variable being tested.
The subatomic particle that carries a positive electrical charge is the -
✔✔proton.
When an atom has two or more outer electron shells, the outer shell will 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 type of bond in which atoms share electrons to produce a completed
outer shell is
a/an _______ bond. - ✔✔covalent
The polarity of water molecules causes them to be attracted to one another
in what's called
a _______ bond. - ✔✔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? - ✔✔Lower
density as ice
The most abundant element by weight in the human body is - ✔✔oxygen
Among living things, the most common polysaccharide structural
carbohydrate is - ✔✔cellulose
Which one of the following functional groups is associated with fatty acids?
- ✔✔Carboxyl
