Biology 1407 Lecture Exam 2 Questions With Complete
Solutions
Mitochondria are thought to be the descendants of certain alpha
proteobacteria. They are, however, no longer able to lead
independent lives because most genes originally present on their
chromosomes have moved to the nuclear genome. which
phenomenon accounts for the movement of genes?
horizontal gene transfer
Giardia intestinalis is an intestinal parasite of humans and other
mammals that causes intestinal ailments in most people who
ingest the cysts. Upon ingestion, each cyst releases two motile
cells, called trophozoites. These attach to the small intestine's
lining via a ventral adhesive disk. The trophozoites
anaerobically metabolize glucose from the host's intestinal
contents to produce ATP. Reproduction is completely asexual,
occurring by longitudinal binary fission of trophozoites, with
each daughter cell receiving two, haploid nuclei (n = 5). A
trophozoite will often encyst as it passes into the large intestine
by secreting around itself a case that is resistant to cold, heat,
and dehydration. Infection usually occurs by drinking untreated
water that contains cysts.
Given its mode of reproduction and internal structures, which of
the following should be expected to occur in Giardia at some
stage of its life cycle?
, Separation (segregation) of daughter chromosomes
Which of the following organisms would be most likely to form
a fossil?
a common squirrel
Which of these events, based on plant fossils, came last (most
recently)?
rise and diversification of angiosperms
Which of the following organisms is a producer?
diatoms
Which of the following pairs of protists and their ecological
roles are correctly matched?
apicomplexans- parasites of animals
Arrange the following terms from most inclusive to least
inclusive
green plants, embryo-bytes, tracheophytes, seedless vascular
plants, ferns
Bryophytes (non-vascular plants) ____________.
Are more similar to ancestral green algae than are vascular
plants.
A porous test(shell) of calcium carbonate, through which
pseudopodia protrude, is characteristic of _____________.
foraminiferans
Solutions
Mitochondria are thought to be the descendants of certain alpha
proteobacteria. They are, however, no longer able to lead
independent lives because most genes originally present on their
chromosomes have moved to the nuclear genome. which
phenomenon accounts for the movement of genes?
horizontal gene transfer
Giardia intestinalis is an intestinal parasite of humans and other
mammals that causes intestinal ailments in most people who
ingest the cysts. Upon ingestion, each cyst releases two motile
cells, called trophozoites. These attach to the small intestine's
lining via a ventral adhesive disk. The trophozoites
anaerobically metabolize glucose from the host's intestinal
contents to produce ATP. Reproduction is completely asexual,
occurring by longitudinal binary fission of trophozoites, with
each daughter cell receiving two, haploid nuclei (n = 5). A
trophozoite will often encyst as it passes into the large intestine
by secreting around itself a case that is resistant to cold, heat,
and dehydration. Infection usually occurs by drinking untreated
water that contains cysts.
Given its mode of reproduction and internal structures, which of
the following should be expected to occur in Giardia at some
stage of its life cycle?
, Separation (segregation) of daughter chromosomes
Which of the following organisms would be most likely to form
a fossil?
a common squirrel
Which of these events, based on plant fossils, came last (most
recently)?
rise and diversification of angiosperms
Which of the following organisms is a producer?
diatoms
Which of the following pairs of protists and their ecological
roles are correctly matched?
apicomplexans- parasites of animals
Arrange the following terms from most inclusive to least
inclusive
green plants, embryo-bytes, tracheophytes, seedless vascular
plants, ferns
Bryophytes (non-vascular plants) ____________.
Are more similar to ancestral green algae than are vascular
plants.
A porous test(shell) of calcium carbonate, through which
pseudopodia protrude, is characteristic of _____________.
foraminiferans
