MCB 100 Exam 2 iclicker Practice Questions and Correct Answers
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Course
MCB 100
Institution
MCB 100
Which of the following is false? 1) The grouping of microorganisms in phylogenetic scheme that is based on nucleic acid sequence data is not always the same as the grouping of microorganisms in a taxonomic scheme based on morphological traits 2) The cells of prokaryotic organisms are divided into c...
MCB 100 Exam 2 iclicker Practice
Questions and Correct Answers
Which of the following is false?
1) The grouping of microorganisms in phylogenetic scheme that is based on nucleic
acid sequence data is not always the same as the grouping of microorganisms in a
taxonomic scheme based on morphological traits
2) The cells of prokaryotic organisms are divided into compartments by internal
membranes
In the most popular current phylogenetic scheme, prokaryotic organisms are divided
into two domains called bacteria and archaea
3) Most if not all of the chemoautotrophic organisms on Earth are prokaryotes
4) The cells of prokaryotic microorganisms contain 70S ribosomes and most circular
chromosomes ✅The cells of prokaryotic organisms are divided into compartments by
internal membranes
When pseudomonas aeruginosa is grown in LB under aerobic conditions and then
stained for biofilm formation the results are a ring as shown for the left tube. When the
bacteria are grown anaerobically in the presence of arginine, the results on the right are
obtained. Which statement best explains the observed results? ✅The P. Aeruginosa
bacteria used Arg to grow anaerobically, so that it no longer had to grow at the air-liquid
interface, which allowed it to form a biofilm all over the tube wall.
Why do doctors caution patients who are pregnant to avoid deli meats, cold cuts, and
soft cheeses? ✅The Listeria bacteria can easily grow in the uncooked food stored in
the refrigerator, it can pass through the placenta, these foods are soft and easy for the
bacteria to spread throughout.
Listeria virulence is directly related to its ability to ✅live within cells and thus avoid
exposure to the immune system of its host.
Why do male teenagers typically have more acne than male adults? ✅The P. Acnes
bacteria overgrow during puberty when sebum is abundant due to higher testosterone
levels, particularly in males.
Which of the following is an advantage for a bacterium having the ability to invade and
reside inside host cells? ✅The host cytosol is rich in nutrients, if access can be gained
by the bacteria
A strain of gram-negative bacterium Neisseria gonorrhoeae, which causes the sexually
transmitted disease gonorrhea, has a mutation that has caused the bacterium to lose
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