An example of a structural polysaccharide includes which of the following?
"a" and "c"
The universal genetic language of DNA is common to virtually all organisms on Earth, however diverse. What is the best explanation for this fact?
the folks that made "Prometheus" seeded the primordial soup with DNA the made the evolution oh humans
A covalent chemical bond is one of which
outer-shell electrons are shared by two atoms so as to satisfactorily fill the outer shells of both
What are the maximum # of covalent bonds an element with atomic #16 will make with hydrogen
Which of the following solutions has the greatest concentration of hydrogen ions [H+]
gastric juice at pH 2
Nitrogen has 7 protons and 7 neutrons. The atomic mass of nitrogen is
How do isotopes of the same element differ from each other?
number of neutrons
Carbohydrates normally function in animals as __
energy source or energy storage molecules
Which of the following characteristics are NOT necessary to being any organism being considered alive?
a medical scientist is designing an experiment to test the results of a new drug that she hypothesizes will greatly reduce and possibly eliminate the side effects of a cancer treatment. If this experiment is to be set up correctly, sh must
divide the patients into two groups and give one group the new drug and the other group a drug that has no effect
A relatively weak bond between a polar molecule and the weak positive charge on a hydrogen atom is called
The four main classes of organic biological molecules include all of the following EXCEPT:
The three dimensional space where one might find an electron is called
What do cohesion, adhesion, and surface tension have in common with reference to water?
all are properties related to hydrogen bonding
Enzyme molecules require specific shape to perform their catalytic function. Which of the following might alter the shape of an enzymatic protein?
all of the above
Proteins may function as all of the following EXCEPT:
energy currency for cells, in the form of ATP
In the crystal matrix of ordinary table salt, the sodium and chlorine are held together by
Which of the following are possible consequences of an increase in atmospheric carbon dioxide (CO2)?
corals and coral reefs are not able to form their hard skeletons, due to lack of carbonate ions
which of the following effects is produced by the high surface tension of water?
lakes don't freeze solid in winter, despite low temperatures
A triacylglyceride is a form of ___ composed of ___
lipid; fatty acts and glycerol
One characteristic shared by sucrose, maltose, and lactose is that
they are all disaccharides
In what polysaccharide form do plants store glucose to be available later as an energy source?
Some substances, such as oil and gasoline, will not dissolve in water because
their molecules have no charge or partial charges to which water molecules can adhere
Which of the following categories includes all of the others in the list
In the term "trace element", the adjective trace means that
the element is required in very small amounts
The specific amino acid sequence in a polypeptide denotes its
The difference between DNA and RNA is
both "b" and "d"
When excreting in warm temperatures, the human body relies on ___ to absorb excess calories of heat and maintain normal body temperature
Which of the following components of a tossed salad will pass through the digestive tract and be digested the least?
cellulose (in the lettuce)
If a protein is described as having a quaternary structure, it means that it has
multiple protein subunits
All of the following are non polar except
Lipids are the only class of macromolecules that contain
When potassium hydroxide (KOH) is added to pure water, it ionizes, releasing hydroxide ions. The resulting solution is
Carbonic acid and sodium bicarbonate act as buffers in the blood. When a small amount of acid is added to this buffer, the H+ ions are used up as they combine with the bicarbonate ions. When this happens the pH of the blood is designed to
change very little
Biological membranes contain bilayers of which of the following lipids?
All of the following are examples of monomer: polymer pairings except
Prokaryotic cells in the genus Sulfolobus are in the Domain Archaea, and are commonly found in the geothermal environments, with an optimum growth temperature of about 80 C. Which of the following features is most likely to allow Archaea to thrive at such temperature?
Sulfolobus membranes contain high concentrations of saturated lipids
An unsaturated fatty acid has at least one __ as part of its long, non- polar chain.
double bonded pair of carbon atoms