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1) the temperature is nearly uniform throughout a lake
a. during winter when the ice forms an insulating cover.
b. during summer when the sunlight warms the surface and the wind mixes the layers.
c. by the end of the fall and spring overturn.
d. at all times due to winds causing constant mixing of the layers.
e. never. the lake always has different temperature layers and they are reversed in winter
and summer.
2) when trying to stimulate breathing, it is better to give a mixture of carbon dioxide
and oxygen than only oxygen because
a. pure oxygen causes you to breathe too rapidly.
b. carbon dioxide and oxygen together exert a greater pressure than an
c. carbon dioxide buildup in the blood stimulates the respiratory center in the brain.
d. oxygen causes lactic acid buildup, and the change in ph prevents breathing.
e. oxygen alone could lead to spontaneous human combustion.
3) the process by which cholesterol is transported into the cell by the binding of ldl to
its receptor and the internalization of the receptor-ldl complex is
a. facilitated transport.
b. active transport.
c. cotransport.
d. endocytosis.
e. exocytosis.
4) which association between zone and description is not correct?
a. littoral - lake zone closest to shore
b. benthic - stream, lake, or ocean floor
c. limnetic - lake zone on surface away from shore
d. bathypelagic - sunlit portion of the ocean
5) the tropical grassland in africa is called the
a. savanna.
b. chaparral.
c. prairie.
d. taiga.
e. tundra.
6) which of the following concepts is not one of the unifying theories of biology?
a. all organisms are composed of cells.
b. life may arise through spontaneous generation.
c. life comes only from life.
d. organisms contain coded information that dictates their form, function, and, at times,
behavior.
e. all living things have a common ancestor and are adapted to a particular way of life.
7) the cycle of viral infection in which the viral dna is integrated into the host's dna is
called the _______ cycle.
a. lysogenic
b. lysozyme
c. lytic
d. lysol
e. lysosome
8) the function of canine teeth in humans is
a. crushing.
b. grinding.
c. shearing.
d. biting.
e. tearing.
9) opportunistic species
a. are composed of large individual organisms.
b. are good dispersers and colonizers of new habitats.
c. are slow to mature.
d. have long life spans.
e. are adapted to stable environments.
10) over many generations man has chosen certain desirable characteristics in dogs by
allowing dogs possessing those characteristics to reproduce. in this way, 150 breeds of
dogs, all in the same species, have descended from wolves. this process is referred to as
a. natural selection.
b. inheritance of acquired traits.
c. artificial selection.
d. convergent evolution.
11) how are dna microarrays used in the study of genomics?
a. they are used to identify the mutations that an individual possesses.
b. they can be used to determine which genes are turned on or off in an individual.
c. they can be used to help determine an individuals genetic profile.
d. all of these are uses for dna microarrays.
e. none of these are uses for dna microarrays.
12) a coastal climate is moderated primarily by which of the following properties of
water? water
a. is the universal solvent.
b. is cohesive and adhesive.
c. has a high heat of evaporation.
d. has a high surface tension.
13) which is not true of eukaryotic cells?
a. a true nucleus contains the chromosomes.
b. eukaryotic cells contain membrane-bounded compartments.
c. they contain ribosomes that are smaller than those of prokaryotic cells.
d. they all contain mitochondria.
e. they contain many organelles in the cytoplasm.
14) darwin's theory of natural selection to explain evolution is also known as
a. descent with modification.
b. inheritance of acquired characteristics.
c. uniformitarianism.
d. catastrophism.
15) most bacteria live in a solution that is hypotonic relative to the cytoplasm of the
bacteria. the cell wall of a bacterium is a peptidoglycan polymer that is tightly
cross-linked. this would therefore function to
a. regulate the flow of most molecules into and out of the bacterial cell.
b. provide a rigid wall that prevents the cell from swelling.
c. provide a rigid wall that prevents the cell from shrinking.
d. confirm a close relationship to plant cells that have a similar structure and live in
hypotonic solutions.
e. make all bacteria fairly uniform in metabolic chemistry.
16) the trophoblast will provide nourishment for the embryo and give rise to the
placenta.
17) which of the following events is not associated with the development of the female
gametophyte?
a. a single parenchyma cell will enlarge to become a megaspore mother cell.
b. the megaspore undergoes meiosis producing four haploid megaspores.
c. the nucleus of the megaspore divides mitotically to produce eight nuclei.
d. the female gametophyte will contain three antipodal cells.
e. all of these are associated with the development of the female gametophyte.
18) study the graph at right. the letter b ' depicts the _____, while c' depicts ________.
a. energy of activation; energy of products
b. energy of products; energy of activation
c. energy of reactants; energy of products
d. reactant concentration; activation energy
