MCB 100 Exam 2 Practice Questions and 100% Correct Answers
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Course
MCB 100
Institution
MCB 100
What is the current biological classification system? The "tree of life"
What is the "tree of life" based on? sequence comparisons of ribosomal small subunit 16S rRNA genes
Under the "tree of life," what are prokarya? bacteria and archaea
What is fall under in the "tree of life"? proteobacteria...
MCB 100 Exam 2 Practice Questions and
100% Correct Answers
What is the current biological classification system? ✅The "tree of life"
What is the "tree of life" based on? ✅sequence comparisons of ribosomal small
subunit 16S rRNA genes
Under the "tree of life," what are prokarya? ✅bacteria and archaea
What is e.coli fall under in the "tree of life"? ✅proteobacteria
What are deeply branching bacteria? ✅prokaryotic autotrophs with rRNA sequences
and growth characteristics thought to be similar to those of earliest bacteria
What type of habitat do deeply branching bacteria live in? ✅extreme habitats - hot,
acidic, high UV radiations
What are characteristics of phototrophic bacteria? ✅acquire energy needed for
anabolism by absorbing lights with pigments in photosynthetic lamellae
lack membrane bound thylakoids
most are autotrophic
What are the three basic shaped of prokaryotic cells? ✅coccus, bacillus, and spiral
What are spirilla? ✅stiff spiral-shaped prokaryotes
What are spirochetes? ✅flexible spiral shaped prokaryotes
What shape are vibrios? ✅curved rods
What shape of coccobacillus? ✅intermediate shape between cocci and bacilli
What are pleomorphic prokaryotes? ✅prokaryotes that vary in shape and size
What are flagella? ✅long structures that extend beyond the surface of cell and propel it
- present in some but not all bacteria
What peritrichous flagella? ✅flagella that cover the whole cell body
What are polar flagella? ✅flagella attached at one or both ends of the cell
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