1) the structures in the outermost ring of floral structures that cover and protect the bud
are
a. carpels.
b. sepals.
c. receptacles.
d. petals.
e. stamens.
2) which of the following is not one of the stages of hiv infection?
a. a greater than 500 cd4 + t cells per microliter of blood.
b. a cd4 + t cell count between 200 and 499 per microliter of blood.
c. a cd4 + t cell count below 200 per microliter of blood.
d. opportunistic infections.
e. flat or raised lesions on the penis or vulva.
3) which is not a structure seen in compact bone?
a. cylindrical structural units called osteons (haversian systems)
b. central canals containing blood vessels and nerves
c. osteocytes located within lacunae
d. bony bars and plates with irregular spaces between them
e. thin extensions of bone cells within canaliculi
4) which statement is not true about polar covalent bonds?
a. most covalent bonds are nonpolar, with electrons shared fairly equally between the
atoms.
b. polar covalent bonds are important in the characteristics of water.
c. electrons are shared unequally in a polar covalent bond.
d. the larger atom in a polar bond attracts the electron more strongly than the smaller
atom.
e. the oxygen of a water molecule is electropositive relative to the hydrogen.
incorrect
5) is it possible that the carbon atoms in your body may have once made up the living
tissues of another person or animal in earlier times? this is
a. possible only if you are a cannibal.
b. possible since carbon cycles through the biosphere.
c. impossible since carbon can’t enter a living system more than once.
d. highly unlikely since carbon is always tied up in molecules in organisms or minerals.
6) phylogenetic trees with proportional branch lengths
a. indicate relatedness among organisms.
b. indicate the relative number of nucleotide pair differences between groups.
c. are constructed by comparing dna sequences of homologous genes and calibrating
this molecular clock with the fossil record.
d. all of the above are true.
7) if a fish suffers from a fungal skin infection that causes the cupula to become
blocked, what will occur?
a. water will not be able to enter the cupula which would prevent the cilia from
bending. if the cilia do not bend in response to the water it will not initiate a nerve
impulse and the fish will lose the ability to detect nearby objects.
b. water will not be able to enter the cupula which would prevent the cilia from
bending. if the cilia do not bend in response to the water it will over stimulate the nerve
impulses and the fish will lose the ability to detect nearby objects.
c. water will not be able to enter the cupula which would prevent the cilia from
bending. the fungal infection would then be allowed to enter into the bloodstream
through the cupula.
d. water will not be able to enter the cupula which would prevent the cilia from
maintaining its normal upright position. if the cilia do not stay upright it will not be able
to initiate a nerve impulse and they will lose the ability to detect nearby objects.
8) patients with diabetes mellitus have frequent urination and increased thirst because
a. less water passes from the glomerulus to the glomerular capsule.
b. more water is driven from the glomerulus to the glomerular capsule than normal.
c. more salt is reabsorbed at the proximal convoluted tubule.
d. an increase in sodium ions causes more nerve stimulation and triggers urination.
e. increased glucose in the urine increases its osmolarity and less water is reabsorbed by
blood.
9) which statement is not correct about the roundworms?
a. there are three layers of tissues in the body.
b. roundworms have a tube-within-a-tube body plan.
c. there is an internal body cavity called a pseudocoelom.
d. roundworms have a smooth unsegmented outside body wall.
e. roundworms are all parasitic.
10) which of the following sensations would involve a chemoreceptor?
a. smell
b. vision
c. taste
d. all of the above are correct.
e. smell and taste only are correct.
11) gills are used in respiration by all of the following aquatic animals except
a. clams.
b. fishes.
c. crabs.
d. polychaete worms.