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1) which of the following is not associated with animal cells?
a. an extracellular matrix
b. plasmodesmata
c. gap junctions
d. adhesion junctions (desmosomes)
e. tight junctions
incorrect
2) which statement is not correct about the trp operon?
a. the structural genes make products that are part of an anabolic pathway for the
synthesis of tryptophan.
b. it is normally turned off if tryptophan is present.
c. tryptophan acts as the corepressor.
d. the regulator gene product is inactive by itself.
e. tryptophan binds to the repressor protein and inactivates it.
incorrect
3) which statement below correctly describes why atp is a high energy structure?
a. atp contains 2 phosphate bonds that contain high levels of energy
b. atp contains hydro-carbon chains that hold energy
c. atp is composed of thymine which is a high energy molecule
d. the last two phosphate bonds are unstable and easily broken
e. the first phosphate bond is unstable and easily broken
4) which of the following molecules forms lengths of dna with 'sticky ends"?
a. dna ligase
b. dna polymerase
c. rna polymerase
d. reverse transcriptase
e. restriction enzyme
5) the over secretion of ______ by the thyroid gland can result in _______________.
a. t3, hyperthyroidism
b. t3, hypothyroidism
c. t4, hypothyroidism
d. calcitonin, hyperthyroidism
e. parathyroid hormone, grave's disease
6) which statement is not true about echinoderms?
a. the exoskeleton is made of spiny plates.
b. gas exchange occurs through skin gills and tube feet.
c. larvae are free-swimming and bilaterally symmetrical.
d. a water vascular system allows the tube feet to produce suction.
e. symmetry is radial in the adult, usually with parts in fives or multiples of five.
7) which of the following situations would be considered an example of positive
regulation of gene expression in a prokaryote?
a. the cap protein regulating the lac operon to be active when glucose is absent and
lactose is present.
b. the cap protein regulating the lac operon to be active when lactose is absent and
glucose is present.
c. the repressor protein regulating the lac operon to be active when glucose is absent
and lactose is present.
d. the repressor protein regulating the lac operon to be active when lactose is absent and
glucose is present.
8) according to the cladogram pictured here, land plants and green algae
a. are in different clades and form a polyphyletic group.
b. are in the same clade and form a monophyletic group.
c. do not share common ancestry.
d. none of the above. i would suggest picking a specific group to ask about instead of
land plants.
9) it is possible to take the mature frond of many ferns and rub the brown growths on
the lower surface over a wet plug of peat moss. soon small heart-shaped green
structures grow on the nutritious peat moss plugs. what has happened?
a. you have broken off male and female structures from the bottom of the fern frond,
and they united on the wet plug to form the sporophyte generation called a prothallus.
b. you have broken the sori on the bottom of the fern frond, and spores fell on the plug
to germinate and form the gametophyte called a prothallus.
c. you have broken the sori on the bottom of the fern frond, and spores fell on the plug
to germinate and form rhizomes that develop an indusium.
d. you have broken the indusium on the bottom of the fern frond, and zygotes
germinated on the plug to form the sporophyte made of an archegonium and an
antheridium.
e. you have broken the sori on the bottom of the fern frond, and zygotes germinated on
the plug to form the fiddleheads that will develop into more fronds.
10) an animal with a brain and a single ventral solid nerve cord is the
a. earthworm.
b. cat.
c. hydra.
d. octopus.
e. planarian.
11) which organism has hemoglobin located in the fluid portion of the blood, giving it a
red appearance?
a. human
b. grasshopper
c. bird
d. earthworm
e. flatworm
12) it is likely that the protocell was
a. heterotrophic.
b. chemoautotrophic.
c. photoautotrophic.
d. all of the above.
e. either heterotrophic or chemoautotrophic.
13) another name for a tetrad is a/an
a. homologue.
b. bivalent.
c. ocyte.
d. gamete.
e. polar body.
14) which of the following plant hormones was discovered in infected rice seedlings
that grew extremely tall and slender with "foolish seedling disease"?
a. abscisic acid
b. auxin
c. cytokinin
d. ethylene
e. gibberellins
15) a solution with a ph of 7.0 has _______ times ________ h+ than a solution of ph
10.
a. 30; more
b. 300; less
c. 103; more
d. 10-3; less
e. none of these are correct.
