Question

Halobacterium Salinarium lives in and requires salt to grow. This is an example of an Archae bacterium described as what?

a) none of the above

b) pyschrophile

c) thermophile

d) osmophile

e) saltophile

2At present the most accurate indicator of evolutionary relatedness among organisms is to determine what?

a) presence of the small ribosomal submit

b) size of nucleus

c) size of bacterial plasmid

d)nitrogen base sequence rRNA

e) Siminilarities of cell membrane proteins

3 Which of the following is found in archaea cells but not in prokaryotic bacterial cells... select all that apply.

a) both contain mitochondria

b) both contain 90s ribosomes

c) both contain nucleus

d) cell membrane

e) nucleus

f) all of the choices are incorrect

g) 70s ribosomes

4In what conditions the cell membrane will help prevent the cells from bursting. Select all that apply

a) isotonic

b) all of the above

c) pure water

d) mesotonic

e) none of the above

f) hypertonic

g) hydrotonic

5Pure oxygen and glucose are found at the highest concentration in a prokaryotic bacterial cell

a) True

b) false

Answer 1

1. None of above

• It is extremely halophilic marine obligate aerobic archaeon.
• The ability of Halobacteium salinarum to survive at such high salt concentrations has led to its classification as an extremophile
• Thermophiles can survive at high temperatures
• Organisms that are capable of growth and reproduction in low temperatures is pyschrophile
• Osmophilic organisms are microorganisms adapted to environments with high osmotic pressures, such as high sugar concentrations.

2. nitrogen base sequence rRNA

Genetic information is stored in the sequence of bases along a nucleic acid chain. The bases have an additional special property: they form specific pairs with one another that are stabilized by hydrogen bonds

3. Nucleus

• Prokaryotes does not have nucleus
• Prokaryotes have some organelle including the cell membrane, also called the phospholipid bilayer.
• Prokaryotes does not have mitochondria

4. Isotonic, hypertonic

• If a cell is placed in a hypertonic solution, water will leave the cell, and the cell will shrink.
• In an isotonic environment, the relative concentrations of solute and water are equal on both sides of the membrane. There is no net water movement, so there is no change in the size of the cell.
• When a cell is placed in a hypotonic environment, water will enter the cell, and the cell will swell.

5. False

Many prokaryotes are facultative anaerobic.

This means that they can switch between aerobic respiration and fermentation, depending on the availability of oxygen.

Glycolysis happens in the cytoplasm of prokaryotic cells and splits glucose, or sugar, into two molecules in order to make ATP.