About 25 of the 92 natural elements are known to be
essential to life. Which four of these 25 elements make up
approximately 96% of living matter?
A) carbon, sodium, hydrogen, nitrogen
B) carbon, oxygen, phosphorus, hydrogen
C) oxygen, hydrogen, calcium,
Humans and mice differ because
A) their cells have different small organic molecules.
B) their cells make different types of large biological
C) their cells make different types of lipids.
D) their cells have some differences in the sequence
Which of the following is a statement of the first law of
A) Energy cannot be created or destroyed.
B) The entropy of the universe is decreasing.
C) The entropy of the universe is constant.
D) Kinetic energy is stored energy that results
Some regions of the plasma membrane, called lipid rafts,
have a higher concentration of cholesterol molecules. As a
result, these lipid rafts
A) are more fluid than the surrounding membrane.
B) are more rigid than the surrounding membrane.
C) are able t
Molecules To Cells:
Liz, Tommy, Lin, Lexi
Hypothesis and Variables
Hypothesis: The feeding rate in T. thermophila depends on the ciliary
beat frequency of T. thermophila.
Dependent variable: Feeding rate