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1) it is estimated that humans have approximately ______ base pairs in our genome.
a. 3 billion
b. 2.5 million
c. 180 million
d. 12 trillion
2) which of the following substances have not been identified as a pamp?
a. double-stranded dna
b. double-stranded rna
c. carbohydrates on the cell walls of bacteria
d. lipids on the cell walls of bacteria
e. proteins on the cell wall of bacteria
3) which of the following organisms lack a hydrostatic skeleton?
a. cicada
b. planarian
c. hydra
d. earthworms
e. roundworms
4) identify this molecule:
a. amino acid
b. hydrocarbon
c. carbohydrate
d. alcohol
e. lipid
5) which of the following is not an accessory organ of digestion?
a. pancreas
b. salivary glands
c. appendix
d. gall bladder
incorrect
6) which of these is not one of the characteristics of a vertebrate?
a. radial symmetry
b. segmentation
c. extreme cephalization
d. closed circulation
e. coelom
7) the root endodermis
a. forms a boundary between the cortex and inner vascular cylinder of the root.
b. contains impermeable lignin and suberin called a casparian strip that controls water
and nutrient movement between adjacent cell walls.
c. is two to three layers of spherical cells.
d. all of the choices are true of root endodermis.
e. forms a boundary between the cortex and inner vascular cylinder of the root and
contains impermeable lignin and suberin called a casparian strip that controls water and
nutrient movement between adjacent cell walls is correct.
8) how is environmental impact measured in a population?
a. population size and resource consumption.
b. population size and resource production.
c. number of individuals dying each generation plus birth rates.
d. all of these are used to measure environmental impact.
e. none of these are used to measure environmental impact.
9) which of the following associations between organism and nutrient source is
incorrect?
a. raccoons - omnivores
b. cows - herbivores
c. earthworms - detritivores
d. bacteria - decomposers
e. humans - carnivores
10) present experimental evidence related to griffith's experiment and the identification
of the cell's genetic material.
when experimenting with streptococcus pneumoniae in the 1920's, griffith noticed that
some colonies were shiny and smooth and some were rough in appearance. he called
the shiny colonies, the s strain' and the rough colonies, the r' strain. when griffith
injected mice with the s strain, which he discovered were encapsulated, they died. when
he injected them with the r strain, they did not die. in trying to determine what factor
was responsible for the s strain's virulence, griffith heat-killed the s bacteria to destroy
the capsule. when he injected mice with the normally fatal s strain bacteria that had
been heat-killed, they did not die. however, if the heat-killed s strain bacteria were
mixed with harmless live r strain bacteria of the same species and injected, the mice did
die. surprisingly, living s strain bacteria were recovered from the bodies of the mice.
griffith concluded that some substance from the dead s strain bacteria passed to the r
strain bacteria, imparting virulence and the ability to form a capsule. avery and others
continued the search for the substance that "transformed" the r strain into the s strain.
hypothesis i: genetic material or "transforming substance" is protein.
hypothesis ii: genetic material or "transforming substance" is rna.
hypothesis iii: genetic material or "transforming substance" is dna.
an experiment was performed that demonstrated that dna extracted from the s strain
bacteria transformed r strain bacteria. this finding:
a. supports hypothesis i
b. supports hypothesis ii
c. supports hypothesis iii
d. rejects hypothesis i only.
e. rejects hypothesis ii only.
f. rejects hypothesis iii only.g. does not support any of these hypotheses.
11) which of the following protein functions is not correctly associated with its correct
integral protein?
a. carrier proteins-facilitate passage of molecules through the membrane
b. enzymatic proteins-catalyze a specific reaction
c. channel proteins-block the activity of carrier proteins
d. cell recognition proteins-recognize pathogens
incorrect
