Which of the following statements is incorrect?
a. isotopes have the same atomic number and different mass numbers.
b. Atoms have about the same number of electrons as protons.
c. All molecules consist of atoms.
d. Free radicals are dangerous because they emit energy.
D
When dissovled in water, a(n) _____________ donates H+ and a(n) _______________ accepts H+
acid, base
A denatured protein has lost its _____________.
shape, function, hydrogen bonds.
Measure of molecular motion
temperature
sugar stored in plants
Starch
Which element has only one proton?
Hydrogen
___________ is a monosaccharide.
a. Glucose
b. Sucrose
c. Ribose
d. Starch
e. a and c.
f. a, b, and c.
e.
polar, dissolves easily in water.
hydrophilic
Charge that has more electrons than protons
negative charge
richest energy source in animals
Triglycerides
The actual attraction of opposite charges holds atoms together as molecules in a(n) ____________bond.
ionic
Unlike saturated fatty acids, the tails of unsaturated fatty acids incorporate one or more __________.
a. phosphate groups
b. glycerols
c. double bonds
d. single bonds
C.
Number of protons in nucleus
atomic number
solute dissolved in solvent
Solution
carries heritable information
DNA
A salt does not release ___________ in water.
a. ions.
b. energy
c. H+
c.
Which of the following is a class of molecules that encompasses all of the other molecules listed?
a. triglycerides
b. fatty acids
c. waxes
d. steroids
e. lipids
f. phospholipids
e.
collectively strong bond
Hydrogen bonds
Which of the following are not found in DNA?
a. amino acids
b. sugars
c. nucleotides
d. phosphate groups
amino acids
Protein primary structure
Polypeptide
A(n) _______ substance repels water.
Hydrophobic
___________ are to proteins as _________ are to nucleic acids.
a. Amino acids; hydrogen bonds
b. Amino acids; nucelotides
c. sugars; lipids
d. sugars; proteins
b.
This charge has more protons than electrons.
Positive charge
water-repellant secretions
Wax
An energy carrier
ATP