BMSC 210 - Collaborative Midterm 1 Questions and Answers (copy)

Which of the following statements is false:

1. Recent evidence shows that Eukarya arise from Asgard Archaea and Eukarya should be included in the Archaea domain

2. Fermented foods and beverages are evidence of ancestral knowledge of microbes

3. the miasma theory is a current and valid scientific theory to describe how infectious diseases are acquired

4. the golden age of microbiology is the period of time of rapid advancements and discoveries leading to the establishment of microbiology as a science

3. the miasma theory is a current and valid scientific theory to describe how infectious diseases are acquired

To study your favourite bacterium, you need to label the pili and track its movement during growth of the bacterial cell. What microscopy technique and staining method will work best?

1. transmission electron microscope with a rubidium red stain

2. light microscope without any staining

3. fluorescent microscopy with a fluorochrome

4. fluorescent microscopy with safranin

3. fluorescent microscopy with a fluorochrome

which group of bacteria stain gram negative but are gram positive and do not have LPS?

1. proteobacteria

2. deep branching bacteria

3. firmicutes

4. fusobacterium

2. deep branching bacteria

which statement is true about dimorphic fungi?

1. Dimorphic fungi grow as mould at 25 degrees but grow as a yeast at 37 degrees

2. dimorphic fungi grow as a mould in the host but as a yeast in the environment

3. dimorphic fungi always grow as a single celled organism but produces more than two distinct cellular morphologies

4. dimorphic fungi do not exist

1. Dimorphic fungi grow as mould at 25 degrees but grow as a yeast at 37 degrees

unlike eukarya, bacteria do not generally have membrane enclosed organelles. What structure in bacteria have a similar function?

1. the basal bodies

2. the nucleoid

3. inclusion bodies and compartments

4. bacteria do not have organized and specialized compartment because they are simple cells

3. inclusion bodies and compartments

you have discovered a new type of prokaryote. You run a biochemical analysis to confirm the cell type (bacterium or archaea). Which statement is false?

1. the presence of pseudomurein would identify the cell as an archaea

2. the lack of peptidoglycan would absolutely identify the cell as archaea and rule out bacteria

3. a cell wall that is cleaved by lysozyme would positively identify the cell as a bacterium

4. the presence of an ether linkage in the cytoplasmic membrane would identify the cell as archaea

2. the lack of peptidoglycan would absolutely identify the cell as archaea and rule out bacteria

if the pool of ATP is depleted in an archaeal cell, what type of motility will be affected?

1. swimming

2. twitching

3. gliding

4. swimming and gliding

5. swimming and twitching

6. gliding and twitching

7. swimming, twitching, an gliding

5. swimming and twitching

what would a strict/obligate anaerobe chemolithotroph need to perform anaerobic respiration?

1. absence of oxygen and presence of glucose and sulphate

2. presence of oxygen, glucose, and sulphate

3. absence of oxygen and presence of hydrogen sulfide and sulphate

4. absence of oxygen and presence of glucose

3. absence of oxygen and presence of hydrogen sulfide and sulphate

you have a mixed culture (gram positive and gram negative bacteria ) and are trying to isolate gram positive bacteria that synthesize their own tryptophan. What type of growth medium would be best to isolate and identify this type of bacteria?

1. a selective defined medium

2. a selective complex medium

3. a differential defined medium

4. a selective differential defined medium

5. a selective differential medium

1. a selective defined medium

Which best describes the bacteria?

alkaphile, halophile, strict anaerobe