DNA codes for the sequence of amino acids in the primary structure of a protein, but not for sugars or lipids. This is because
Question 1 DNA codes for the sequence of amino acids in the primary structure of a protein, but not for sugars or lipids. This is because
sugars and lipids code for their own replication.
only proteins are involved in living metabolic reactions.
proteins are the main structural and functional components of cells.
other hereditary molecules code for sugars and lipids.
sugars and lipids are ever present in the living environment and are not used in living structures.
Question 2Hydrogen bonding produces which of the following properties of water?
Water can be more dense as ice than as liquid water.
Water absorbs heat with a large change in temperature.
Water boils at a lower temperature than expected.
Water is less dense as ice than as liquid water.
Water releases heat with a large change in temperature.
Question 3If an element has an atomic number of 12, how many electrons are in its outermost shell?
2
12
8
1
10
Question 4Maltose is classified as a
lipid.
nucleic acid.
fatty acid.
protein.
carbohydrate.
Question 5Nucleic acids are polymers of
fatty acids.
amino acids.
monosaccharides.
glycerol.
nucleotides.
Question 6The atomic mass of an element
equals the number of neutrons.
equals the number of protons plus the number of electrons.
is determined by the number of protons and neutrons it contains.
depends on the number of electrons in the outermost shell.
changes after each reaction.
Question 7The primary function of carbohydrates is
structural reinforcement of plant and fungal cell walls.
to speed chemical reactions in cells.
to transport molecules across cell membranes.
quick fuel and short-term energy storage.
encoding the hereditary information.
Question 8The proposed cause of CJD and kuru in humans, mad cow disease, and scrapie in sheep is a change in a brain protein. Disease victims appear to have a protein that should normally contain alpha helices but instead they have changed into a protein made of beta pleated sheets. The disease appears to spread when the abnormal protein comes into contact with the normal protein, causing it to become deformed. Which level of protein structure is associated with these diseases?
quaternary
tertiary
secondary
molecular
primary
Question 9Which of the following radiation uses is the one that is most likely to have both beneficial and harmful consequences?
using radiation to treat a cancer patient
using radiation to sterilize mail
radiating fruits and vegetables prior to storage
using radiation to sterilize surgical equipment prior to a surgery
All of the answer choices will have beneficial and harmful consequences.
Question 10Which of the following statements about hydrogen bonding is incorrect?
Hydrogen bonding occurs only between water molecules.
Hydrogen bonds are easily broken.
Hydrogen bonding can occur between different molecules or within the same molecule.
Most hydrogen bonds involve hydrogen and oxygen or nitrogen.
The structure of a large, complex molecule can be influenced by hydrogen bonding.
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