45 notecards = 12 pages (4 cards per page)
What are the six most common elements needed in large amounts in living things?
The smallest indivisible part of an element is the
The mass number of an atom is determined by adding the number of
2. neutrons and protons.
All the following are components of an atom except
What is the densest part of an atom that has the greatest amount of the mass of the atom?
3. atomic nucleus.
What makes up the atomic number of an element?
What makes up the atomic weight of an element?
4. neutrons + protons.
How many electrons are in a neutral atom?
2. The same number as the protons in the atom.
What is the difference between ions and atoms of an element?
1. number of electrons they possess.
What do you get when an atom gains an electron?
3. An anion.
Carbon enters into an enormous number and variety of chemical combinations partly because
What is an inert element?
4. An element where the outer shell will not hold additional electrons.
The formation of a chemical bond that combines atoms in molecules depends in large measure on the
2. placement of electrons in the shells.
What happens in the formation of an ionic bond?
3. a transfer of electrons.
What happens when two oppositely-charged atoms are attracted and are held together?
3. They form an ionic bond.
What happens when a chemical bond is formed between the electropositive sodium ion and the electronegative chloride ion?
4. An ionic bond forms.
What is the result of two or more atoms joining together?
4. A molecule.
What kind of bond is found in water, H2O?
2. It has a polar covalent bond.
Which one of the following statements does not apply to hydrogen bonds?
3. They are very strong bonds.
All the following characterize hydrogen bonding except
1. a strong and stable chemical force.
In the chemical reaction A + B => AB, which are the reactants?
4. A and B
What happens in a dehydration or synthesis reaction?
An acid is a chemical substance that
4. All the above are correct.
A substance whose pH is 8 contains
Why is a buffer important?
3. It maintains a stable pH in living things.
Which one of the following is not an organic molecule?
The carboxyl group is important biologically. What is its chemical formula?
What is a functional group symbolized by –NH2 known as?
3. amino group.
What is an important difference between monosaccharides and polysaccharides?
3. the number of carbohydrate monomers in the molecule.
Carbohydrates are so named because
Glucose units may be linked in chains of hundreds or thousands in
Fatty acids that contain many double bonds and lack hydrogen atoms are commonly said to be
Guanine and cytosine are important constituents of
2. the chromosome of a cell.
. All the following are components of a RNA molecule except
Nucleic acids are composed of all the following except
3. amino acids.
What nucleotide is a universal form of energy for cells?
The peptide bond is a type of covalent bond that forms
3. between amino acids.
In the formation of proteins, ______react with one another to form a linkage called a(n) ______.
4. amino acids, peptide bond
Which one of the following is not associated with proteins?
4. Saturated fatty acids
There are ________ amino acids that build proteins.
The sequence of amino acids in a protein is referred to as its
Which one of the following is not found in the secondary structure of proteins?
3. Disulfide bridge
The tertiary structure of a protein is determined by the folding back on itself and forming of ionic and hydrogen bonds between the
2. R groups
A denatured protein is one that
Which of the following organic elements is the most abundant in microorganisms?