1) which of the following statements about dna replication is not correct?
a. unwinding of the dna molecule occurs as hydrogen bonds break.
b. replication occurs as each base is paired with another exactly like it.
c. the process is known as semiconservative replication because one old strand is
conserved in the new molecule.
d. the enzyme that catalyzes dna replication is dna polymerase.
e. complementary base pairs are held together with hydrogen bonds.
incorrect
2) the most common lethal genetic disease among caucasians is
a. neurofibromatosis.
b. tay-sachs disease.
c. phenylketonuria.
d. albinism.
e. cystic fibrosis.
3) ultimate control of testes development is by the _____ which secretes _____.
a. anterior pituitary; gonadotropin-releasing hormone
b. anterior pituitary; testosterone
c. seminiferous tubules; inhibin
d. hypothalamus; gonadotropin-releasing hormone
e. hypothalamus; testosterone
4) ion concentration differences produce an action potential creating a stimulus. the
difference between a weak stimulus and an intense stimulus is
a. the action potential is graduated and a weak stimulus causes a small change in
polarity.
b. weak stimuli only open sodium gates, strong stimuli also open potassium gates.
c. the frequency at which an axon fires.
d. a strong stimulus does not allow repolarization but sends a constant flow of ions.
e. all of the choices are correct.
5) which of the following list best describes the features used to classify an organism as
a member of domain bacteria?
a. unicellular, lacking a nuclear envelope and membrane bound organelles, contains
ribosomes but lacks introns
b. unicellular, contains anuclear envelope and membrane bound organelles, contains
ribosomes but lacks introns
c. unicellular, lacks anuclear envelope and membrane bound organelles, contains
introns but lacks ribosomes
d. multicellular, lacks anuclear envelope and membrane bound organelles, contains
introns but lacks ribosomes
6) which of the following autoimmune diseases can potentially be avoided by
preventing or completely curing a streptococcus infection?
a. rheumatic fever
b. rheumatoid arthritis
c. systemic lupus
d. hiv
7) of those listed, which level of classification is the most specific?
a. kingdom
b. phylum
c. family
d. domain
e. class
8) which of the following alga is mismatched with its description?
a. chlamydomonasunicellular
b. volvoxfilamentous
c. ulvamulticellular
d. charamulticellular
incorrect
9) which statement is not true about enzyme inhibition?
a. in competitive inhibition, the inhibitor binds to the active site of the enzyme.
b. in noncompetitive inhibition, the inhibitor binds to the allosteric site of the substrate.
c. in irreversible inhibition, a poison binds to the enzyme so that it can never work
again.
d. most inhibitors act in a reversible fashion.
e. all of the statements are true.
10) if you were using cladistics to construct a phylogenetic tree of birds, what is the
best outgroup?
a. eagles
b. robins
c. bats
d. eastern bluebirds
11) which of the following help direct the movement of materials or organelles
throughout the cell?
a. rough endoplasmic reticulum
b. cytoskeleton
c. smooth endoplasmic reticulum
d. all of the choices are true
12) what is the maximum number of electrons that will be in the 1st valence shell?
a. 2
b. 1
c. 3
d. 6
e 8
13) what is complementary dna (cdna)?
a. cdna is the strand of dna opposite the strand used to make mrna.
b. cdna is a sequence of dna as it is found in the genome.
c. cdna is any sequence of cloned dna.
d. cdna is dna made from a mature mrna template.
e. cdna is dna made through the polymerase chain reaction.
14) scientists developed the ____________ model after their studies of the fossil record
revealed that some species appear quite suddenly and then remain essentially
unchanged phenotypically for a long period of time.
a. hardy-weinberg
b. urey-miller
c. gradualistic
d. punctuated equilibrium
15) which of the following is/are true about natural selection?
a. it acts on genotypes rather than phenotypes.
b. it assures the survival of each fit individual.
c. on average, it favors the survival of more young with adaptive characteristics.
d. it always selects for more complex forms.
e. all of the choices are correct.
16) which health issue is related to aging issues associated with the immune system?
a. an elderly patient does not respond well to vaccinations.
b. the thymus increases in size due to an accumulation of adipose tissue.
c. the number of natural killer t cells declines.
d. all of the choices are correct.
e. none of the choices are correct.
17) the major functions of the plasma membrane do not include
a. separation of the fluid environments inside and outside the cell.
b. regulation of molecules and ions that pass into and out of the cell.
c. recognition and communication between different cells and tissues.
d. maintaining connections between adjacent cells.
e. production of proteins used in construction of the cell wall.