in semester practice exam questions Flashcards
one piece of evidence that supports the hypothesis that animals are related to choanoflagellates is that
the inner cavity of sponges, the spongocoel, is lined by cells that resemble choanoflagellates
stinging cells of cnidarians are called
cnidocytes
the digestive system of cnidarians is called a gastrovascular cavity because it
distributes nutrients, oxygen and wastes to different regions of the body
animals w a distinct head region, an anterior brain, and displaying forward, directed locomotion in some part of their life have the following form of body symmetry
bilateral symmetry
3 embryonic germ layers are
endoderm, mesoderm, ectoderm
the trypanosoma brucei species complex contains species that are:
a. Flagellated protistans (SCEs same thing)
b. Parasites of the blood of mammals;
c. Cause the disease nagana in domestic cattle in Africa;
d. Able to invade the central nervous system of their infected hosts;
e. All of a-d above.
all of the above
coccidians are apicomplexans responsible for many diseases of many animals including chickens. Coccidians:
a) infect cells in GI tract
b) produce a cyst, called the oocyst, that protects the organisms in the external environment
c) display asexual and sexual reproduction in its life cycle
d) all of the above
all of the above
members of the apicomplexan genus babesia are important pathogens of cattle. Cattle become infected with babesia when:
an infected cattle tick injects babesia parasites w saliva into the bovine
in comparison to animal cells, plant cells lack:
a) flagella and cilia
b) centrosomes
c) centrioles
d) lysosomes
e) all of the above
all of the above
the organism thought to be the closest living relatives of the animals (metazoans) belong to a clade known as the
choanoflagellates
form of interspecific association where one organism lives inside another organism and first derives benefit from the association while causing harm to the second is called;
parasitism
form of body symmetry associated w directed locomotion and cephalization is
bilateral symmetry
viruses that cause the diseases dengue, zika and yellow fever are transmitted to humans by
mosquitoes
- Which of the following statements about viruses is NOT correct?
a. Viruses are metabolically inert outside the host cell;
b. Viruses possess only one type of nucleic acid;
c. Viruses multiply by binary fission; agree - hijack host cell metabolism and resources to replicate themselves
d. Viruses cannot produce their own energy or macromolecules;
e. In their most basic form, viruses consist of nucleic acid surrounded by a protein coat;alive
c) they don’t multiply by binary fission
to answer: are viruses alive? which of the following is most important to consider
viruses have the genetic potential to replicate and evolve
which of the following organelles are NOT components of animal cells
nuclei, central vacuoles, centrioles, flagella, cilia
central vacuoles
members of phylum cnidaria are
diploblastic metazoans, displaying radial symmetry and bearing stinging cells called cnidocytes
the theory to explain the origin of eukaryote life is
endosymbiosis theory
for feeding, members of the phylum porifera
draw water into internal cavity, the spongoceol, water passes through specialized channels in their bodies under the action of chaonocytes
which of the following is not a component of the eukaryotic nucleus or its membrane: histones, nuclear pores, DNA, endoplasmic reticulum
endoplasmic reticulum
in the process of exocytosis, molecules pass through these organelles in the following sequence
endoplasmic reticulum, golgi apparatus, secretory or transport vesicles, external plasma membrane
Which of the following statements is correct?
a. Point mutations are always lethal to cells and organisms
b. Point mutations always result in changes in coded amino acids
c. Point mutations can sometimes produce changes in coded amino acids in proteins
d. Point mutations occur in proteins
point mutations can sometimes produce changes in coded amino acids in proteins
which is NOT an autotroph:
photosynthetic alga
photosynthetic bacterium
symbiotic ciliate in rumen of sheep
tree
symbiotic ciliate in the rumen of a sheep
mutualism is a form of symbiotic relationship in which
one organism lives in or on another organism, both benefit
giardia parasites transit between hosts through
feacal-oral transmission, a cyst stage of parasite passes w feces of an infected host and new host infected by ingesting those cysts
apicomplexa is a clade of single cell eukaryotes, the name apicomplexa refers to:
the presence in the cell of an apical complex that is used to invade host cells
which of following displays radial symmetry; planarian, fish, hydra, haemonchus
hydra
