1. Chris and Kassie are working in a research lab and are hopingto study the movement ofribosomal subunits through the nuclear porecomplex. Which microorganism would theymost likely choose as theirmodel organism?
a. The lactic acid bacterium Lactobacillus lactis.
b. The archaeon Thermoproteus tenax.
c. Escherichia colid. The protozoan Giardia lamblia.
2-For many years, scientists saw no evidence for a cytoskeletonin prokaryotic cells.However, in 2001 researchers at OxfordUniversity in the UK described two actin-likeproteins called MreBand Mb1 in the prokaryotic bacterium Bacillus subtilis (Cell,104:913-922). To which component of the eukaryotic cytoskeleton arestructures composed ofMreB and Mb1 thought to be the mostsimilar?
a. Microfilamentsb.
b-Microtubulesc.
c-Pseudopodiad.
d-Intermediate filamentse.
e-Nucleoli
3-The eukaryotic nucleus was discovered in 1831 by a Scottishbotanist named RobertBrown (Bill Bryson, A Short History of NearlyEverything). It comes from the latinword meaning kernel. Whichstatement regarding the eukaryotic nucleus is FALSE?
a. Intermediate filaments could be isolated from the nucleus ofaeukaryoticcell (particularly an animal cell).
b. The nucleolus is a distinct, but not membrane-bound regionwithin the eucaryoticnucleus. It is the site of rRNA synthesis.
c. Within the eukaryotic nucleus, basic proteins assist in thepackaging of DNA.
d. Chromatin in which the DNA is relaxed and the genes are beingactivelyexpressed is called euchromatin.
e. Like the cytoplasmic membrane, the nuclear membrane isselectively permeableand only allows free passage of low molecularweight molecules such as O2.
4-If a eukaryotic protist had a mutation that lessened theaffinity of ribosomes for the surface the rough endoplasmicreticulum what would likely be the harmful effect?
a. These protists would have inefficient ATP production.
b. These protists would be unable to degrade macromoleculesengulfed duringendocytosis.
c. These protists would less effectively secrete proteins thatwork in the extracellularspace.
d. These protists would have decreased lipid synthesis.
5. Stephanie and Jennifer are working with a sample that wastaken from a patient with ayeast infection. These young scholarswant to isolate the yeast in the sample by selectingagainst all ofthe bacteria that are also present. What might they add to themedium inorder to do this?
a. An antibiotic that targets the 70S ribosome.
b. An antibiotic that targets peptidoglycan.
c. Lysozyme.
d. Any of the above.
