1) the four defining characteristics of chordates are
a. segmentation, a dorsal hollow nerve cord, pharyngeal pouches, and an amniotic egg.
b. a dorsal hollow nerve cord, a notochord, bilateral symmetry, and mammary glands.
c. bilateral symmetry, segmentation, a well-developed coelom, and limbs.
d. a well-developed coelom, pharyngeal pouches, a notochord, and jaws.
e. pharyngeal pouches, a dorsal nerve cord, a notochord, and a postanal tail.
2) the coronary arteries are important because they serve the
a. intestine and liver.
b. brain.
c. lungs.
d. heart.
e. urinary tract.
3) the largest biome on earth is the
a. tundra.
b. taiga.
c. temperate deciduous forest.
d. desert.
e. ocean (marine aquatic).
4) the offspring of a monohybrid testcross would have what possible genotype(s)?
a. aa and aa.
b. aa and aa.
c. aa, aa, and aa.
d. aa only.
e. aa only.
5) ________ is contained in pancreatic juice to neutralize the acidity of chyme from the
stomach.
a. sodium bicarbonate
b. trypsin
c. pancreatic amylase
d. bile
6) the function of the human stomach is
a. to produce highly basic fluids to kill most bacteria.
b. to begin the absorption of most small food molecules, especially sugars and alcohol.
c. storage of food and mixing with digestive fluids to continue chemical digestion.
d. promotion of bacterial fermentation.
e. absorption of iron to build hemoglobin for red blood cells.
7) during the formation of an embryo, the hollow ball of cells having a fluid-filled
cavity is called a
a. morula.
b. blastula.
c. blastocoel.
d. gastrula.
e. neurula.
8) there are several species of grain beetles that live on dry meal and do considerable
damage to stored grain. in an experiment, a dozen jars of dry meal are set up and fifty
individuals of each species, both males and females, are added to each jar. the food
supply is not quite sufficient to last for six months and the size of the jar is adequate so
that wastes do not become toxic. most likely, examination of the jars in six months will
find
a. a totally random variation in numbers of both beetles.
b. only one species per jar.
c. the same ratio of beetles as when you started (about half from each species).
d. only dead beetles in all jars due to intense competition for the niche.
9) soil formation is due to
a. decomposition of organic matter.
b. mechanical weathering of bedrock.
c. chemical weathering of rock.
d. all of the choices are correct.
10) in order to infect a cell, a virus must
a. inject its protein into the cell while the nucleic acid remains attached to the host cell
surface.
b. have a special protein on its surface that can interact with a protein on the surface of
the host cell.
c. actively burrow through the cell wall or cell membrane of the host cell to reach the
cell’s nucleus.
d. produce a special extension of its cytoplasm when it comes into contact with the
appropriate host cell.