BIO 117 Practice Questions with 100% Correct
Answers
A monophyletic group includes all of the descendants of a common ancestor. Are
protists considered a monophyletic group?
A) Protists are considered monophyletic because they are all contained within the
eukaryotic group
B) Protists are not considered monophyletic because they do not live in a common type
of habitat
C) Protists are considered monophyletic because they are mostly unicellular organisms.
Plants, fungi, and animals are mostly multicellular
D) Protists are not considered monophyletic because they do not include the plants,
animals, and fungi
D) Protists are not considered monophyletic because they do not include the plants, animals,
and fungi
A student observes a wormlike organism crawling about on dead organic matter. Later,
the organism sheds its outer covering. One possibility is that the organism is a larval
insect (like a maggot). However, it might be a member of the phylum ________, and one
way to distinguish between the two possibilities is by looking for the presence or absence
of ________.
A) Nematoda; segmentation
B) Annelida; a body cavity
,C) Nematoda; an alimentary canal
D) Platyhelminthes; a cuticle of chitin
A) Nematoda; segmentation
According to the endosymbiosis theory of the origin of eukaryotic cells, how did
mitochondria originate?
A) from the nuclear envelope folding outward and forming mitochondrial membranes
B) from infoldings of the plasma membrane, coupled with mutations of genes for
proteins in energy-transfer reactions
C) by secondary endosymbiosis
D) from engulfed, originally free-living proteobacteria
D) from engulfed, originally free-living bacteria
Adaptations to terrestrial environments evolved independently in arthropods, mollusks,
nematodes, and annelids. What logical conclusion would you make from this statement?
A) All these groups lost their coelom after moving to land
B) All these groups have a coelom
C) The common ancestor of all these groups was probably aquatic
D) All these groups have the same type of body plan
C) The common ancestor of all these groups was probably aquatic
All arthropods ________. Select all that apply
A) have segmented bodies
B) have an exoskeleton or cuticle
, C) have jointed appendages
D) molt
E) undergo complete metamorphosis
A) have segmented bodies
B) have an exoskeleton or cuticle
C) have jointed appendages
D) molt
All of the following support the sponges-first hypothesis for the origin of
multicellularity in animals EXCEPT ________.
A) there are older fossils of sponges than any other animal group
B) a sponge's feeding cells share a similar structure to choanoflagellates
C) sponges possess genes that are involved in cell specialization
D) a benthic lifestyle of choanoflagellates would support colonies of cells occurring
together
E) ctenophores (comb jellies) lack miRNAs, while sponges have these gene regulators
E) ctenophores (comb jellies) lack miRNAs, while sponges have these gene regulators
All protists are _____.
A) unicellular
B) eukaryotic
C) symbionts
D) monophyletic
E) mixotrophic
Answers
A monophyletic group includes all of the descendants of a common ancestor. Are
protists considered a monophyletic group?
A) Protists are considered monophyletic because they are all contained within the
eukaryotic group
B) Protists are not considered monophyletic because they do not live in a common type
of habitat
C) Protists are considered monophyletic because they are mostly unicellular organisms.
Plants, fungi, and animals are mostly multicellular
D) Protists are not considered monophyletic because they do not include the plants,
animals, and fungi
D) Protists are not considered monophyletic because they do not include the plants, animals,
and fungi
A student observes a wormlike organism crawling about on dead organic matter. Later,
the organism sheds its outer covering. One possibility is that the organism is a larval
insect (like a maggot). However, it might be a member of the phylum ________, and one
way to distinguish between the two possibilities is by looking for the presence or absence
of ________.
A) Nematoda; segmentation
B) Annelida; a body cavity
,C) Nematoda; an alimentary canal
D) Platyhelminthes; a cuticle of chitin
A) Nematoda; segmentation
According to the endosymbiosis theory of the origin of eukaryotic cells, how did
mitochondria originate?
A) from the nuclear envelope folding outward and forming mitochondrial membranes
B) from infoldings of the plasma membrane, coupled with mutations of genes for
proteins in energy-transfer reactions
C) by secondary endosymbiosis
D) from engulfed, originally free-living proteobacteria
D) from engulfed, originally free-living bacteria
Adaptations to terrestrial environments evolved independently in arthropods, mollusks,
nematodes, and annelids. What logical conclusion would you make from this statement?
A) All these groups lost their coelom after moving to land
B) All these groups have a coelom
C) The common ancestor of all these groups was probably aquatic
D) All these groups have the same type of body plan
C) The common ancestor of all these groups was probably aquatic
All arthropods ________. Select all that apply
A) have segmented bodies
B) have an exoskeleton or cuticle
, C) have jointed appendages
D) molt
E) undergo complete metamorphosis
A) have segmented bodies
B) have an exoskeleton or cuticle
C) have jointed appendages
D) molt
All of the following support the sponges-first hypothesis for the origin of
multicellularity in animals EXCEPT ________.
A) there are older fossils of sponges than any other animal group
B) a sponge's feeding cells share a similar structure to choanoflagellates
C) sponges possess genes that are involved in cell specialization
D) a benthic lifestyle of choanoflagellates would support colonies of cells occurring
together
E) ctenophores (comb jellies) lack miRNAs, while sponges have these gene regulators
E) ctenophores (comb jellies) lack miRNAs, while sponges have these gene regulators
All protists are _____.
A) unicellular
B) eukaryotic
C) symbionts
D) monophyletic
E) mixotrophic
