Question

1.      Mycoplasmas are bacteria that lack cell walls. Therefore, on the basis of this structural feature you could expect that..

a)      They also lack a cell membrane.

b)      They would stain purple with gram stain

c)      They would stain pink with gram stan

d)      They would look just like animal cells

2.      Which type of organism can use light energy to generate ATP, but very likely will not release oxygen as a result of this process?

a)      Photoautotroph

b)      Photoheterotroph

c)      Chemoautotroph

d)      Chemoheterotrph

3.      Suppose a species of bacteria lives on the surface of a Mexican ghost tarantula spider, where it obtains nutrition from the spider’s nonliving, waxy covering on its exoskeleton, while inhibiting the growth of other microbes that are spider pathogens. However, should this bacterium somehow manage to get into the circulatory system of the spider, it causes a fatal disease. Once the spider dies, this same bacterium and its offspring proceed to decompose it. What is the correct sequence of ecological roles played by the bacterium in the situation described here?

1.      Nutrient recycler

2.      Mutualist

3.      Commensal

4.      Pathogen

5.      Primary producer

a.       1,3,4

b.      1,2,5

c.       2,3,4

d.      2,4, 1

4.      Some reseracers have begun attempting to precipitate radioactive uranium from groundwater by adding nonindigenous microbes to the soil, in the hopes that these bacteria will neutralize the dangerous radioactive chemical in the soil and groundwater. This is an example of____

a)      Bioremediation

b)      Transduction

c)      Heterocyst utilization

d)      Transformation

5 which of the following traits do most archeans and bacteria share?

1. A peptoglycan cell wall

2 A cell membrane

3 Lack of a nuclear membrane

4 Susceptability to antibiotics

a)1 and 2

b) 2 and 3

C) 3 and 4

D) 1 and 4

Answer 1

Mycoplasma does not contain any cell wall around its membrane so it is generally not used to stain with gram stain. Generally DNA stains such as DAPI or Hoechst used for staining. As they do not contain cell wall so they look like animal cells.

Chemoheterotrophs live in extreme condition and they transfer their electron to sulpher instead of oxygen. Here d is correct option.

They obtain food from wax of spider and prevent the growth of other pathogen so in this only one is benifitted hence they are commensal microorganism.

Causing fatal disease therefore pathogen and start decaying hence they are nutrient cycler.

1, 3, 4 is correct answere that is a.

Leaching of radioactive material is called bioreduction that come is bioremediation.

Archea contain pseudo peptidoglycan memebrane where as bacteria contain peptidoglycan.

Both contain cell membrane but archea having ether linkage and bacterial having ester linkage.

Both having naked DNA

Susceptible to antibiotics.

Here 3 and 4 option are more correct. Answer is C