Questions #1

Question 1

Production of Bactiracin is aided by which bacteria?

Answer 1

BACILLUS LICHENIFORMIS

Question 2

Bacillus licheniformis is known for what?

Answer 2

Anitbiotc BACTIRACIN production

Question 3

Transduction was demonstrated in? By? Want about another demonstration in another gram negative bacteria in the same topic, even has one same scientist.

Answer 3

Salmonella typhi (Gram negative) 
Zinder and Lederberg 

Conjugation: by Lederberg and Tatum in E. coli (Gram negative)

Question 4

Griffith did whaaaat in whaaaaat?

Answer 4

Transformation experiment in gram positive Diploi/Streptococcus pneumonae

Question 5

Answer wrt gram positive or negative bacteria: 1). Whose cell wall is multilayered?

2) . Whose cell wall is thick?
3) . Which has more murein? What about lipid?
4) . TEICHOIC ACID
5) . MESOSOMES
6) . Pili and flagellation
7) . Capsuled? What for by the way?

Answer 5

1) . Gram negative has an outer murein and inner LPS (lipopolysaccharide layer) whereas positive just has one peptidoglcan layer
2) . Gram positive has thicker cells wall (15-20nm), gram negative (7.5-12nm)
3) . Gram positive has more murein content, and negative has more lipid content
4) . TEICHOIC ACID IS PRESENT IN CELL WALL OF GRAM POSTIVE BACTERIA
5) . MESOSOMES ARE PRESENT IN GRAM POSITIVE BACTERIA
6) . More flagellation and pili number seen in negative
7) . Negative is mostly capsullated and mostly pathogenic, capsule helps the bacteria hide from the host’s immune system

Question 6

Gram positive examples

Answer 6

99% Actinomycetes members are gram positive like Frankia, Mycobacterium, Streptomyces
(EXCEPTION: XANTHOMONAS)

Other examples include Streptococcus, Staphylococcus

Question 7

Gram negative examples

Answer 7

Cyanobacteria, Mycoplasma, Salmonella, E. coli, RHIZOBIUM, Xanthomonas

Question 8

Name the smallest, mostly non motile, and two most common bacterial shapes.

Answer 8

Smallest: Cocci
Mostly non-motile: Cocci
(One rationale for this correlation might be that spherical cells such as thecoccisimply donothave the best geometry for directional movement by flagella, unlike more linear bacteria)

Most common: Bacillus, Cocci

Question 9

Rhizobium is a gram negative symbiotic nitrogen fixing bacteria. Name some others examples.

Answer 9

True, Rhizobium is a gram negative symbiotic nitrogen fixing bacteria found in the root of legumes.

Other examples include:

Frankia: actinomycetes member (gram +) fixes nitrogen in non leguminous roots of Alnus, Casuarina, Myrica

Xanthomonas: Actinomycetes member (only gram - member) which also fixes nitrogen in non leguminous plants such as Palmitia