EXAM 1
What kind of subatomic particles have charge but no appreciable mass?
Electrons
Large numbers of ribosomes are present in cells that specialize in producing which of the following molecules?
Proteins
Which molecule is referred to as “buffer” to maintain plasma membrane fluidity?
Cholesterol
What are the two molecules that act as electron carriers in the electron transport chain?
NADH + FADH2
Crossing over begins to occur during what phase?
Prophase I
Measurements show that the pH of a particular lake is 6.0. What are the concentrations of hydrogen ion and hydroxide ion of the lake?
H+ = 10-6
OH- = 10-8
What type of bond is formed between amino acids in a protein chain?
Peptide Bond
Give an example of a molecule that requires active transport to cross the lipid bilayer.
Sodium Ions, Potassium Ions
What is the role of oxygen in aerobic respiration?
final electron acceptor in the elctron transport chain
Why does sexual reproduction (via meiosis) have an advantage over asexual reproduction (via mitosis)?
Meiosis increases genetic variation among offspring.
Moderation of air temperature in coastal areas by water is due to which property of water?
High Specific Heat
For this pair of items, what best describes their relationship? (A) The number of purines in the DNA strand 5ʹ-AAGAGGAGAAA-3ʹ (B) The number of pyrimidines in the DNA strand 5ʹ-AAGAGGAGAAA-3ʹ
>, <, =
A > B
If an enzyme solution has low substrate concentration, what can you do to obtain a faster yield of products?
increase amount of substrate
In photosynthesis, where do light reactions occur? Where does the Calvin cycle?
Thylakoids, Stroma
What structures exchange genetic material during crossing over?
Non-sister Chromatids
Sulfhydryl group is present in which type of biomolecule?
Proteins
True or False: In a DNA molecule the nitrogenous bases from the two polymer chains are held together by covalent bonds.
False, held together by hydrogen bonds.
What word would describe an integral membrane protein in terms of its relationship with water?
Amphipathic
Name 3 processes that produce ATP and the type of phosphorylation used.
Glycolysis and Krebs Cycle - Substrate Level Phosphorylation
ETC - Oxidative Phosphorylation
What is the phenotypic ratio of Mendel’s dihybrid crosses in the F2 generation
9:3:3:1
Which two molecules act as pH buffers in blood?
Carbonic Acid and Bicarbonate Ions
What is the chemical mechanism by which cells make polymers from monomers?
Dehydration Reactions
ATP molecules are hydrolyzed in two enzymatic chemical reactions during glycolysis. What are the names of the two enzymes?
Hexokinase and Phosphofructokinase
Which process occurs in both photosynthesis and respiration?
Chemiosmosis
A pea plant is heterozygous at the independent loci for flower color (Pp) and seed color (Yy). What types of gametes can it produce?
four gamete types: pY, py, PY, and Py