Q1dh6d vdfgaed ttryhff

How many pili are in a bacterial cell

Snowcat [4.5K]

Answer: Bacterial species where observed Typical number on cell Distribution on cell surface

Escherichia coli (common pili or Type 1 fimbriae) 100-200 uniform

Neisseria gonorrhoeae 100-200 uniform

Streptococcus pyogenes (fimbriae plus the M-protein) ? uniform

Pseudomonas aeruginosa 10-20 polar

Explanation:

Pili are structures that extend from the surface of some bacterial cells.

These are hollow, non-helical, filamentous appendages.

Hope it helps you

7 0

3 years ago

2.50g of a certain Compound X, known to be made of carbon, hydrogen and perhaps oxygen, and to have a molecular molar mass of 12

Art [367]

Answer:

Molecular Formula = C₁₀H₈

Explanation:

Step 1: Calculating Moles for each Element:

C = Mass of CO₂ × (1 mol of CO₂÷ M.Mass of CO₂) × (1 mol of C ÷ 1 mol of CO₂)

C = 8.60 g × (1 mol of CO₂÷ 44.011 g.mol⁻¹) × (1 mol of C ÷ 1 mol of CO₂)

C = 0.1954 mol

H = Mass of H₂O × (1 mol of H₂O ÷ M.Mass of H₂O) × (2 mol of H ÷ 1 mol of H₂O)

H = 1.41 g × (1 mol of H₂O ÷ 18.106 g.mol⁻¹) × (2 mol of H ÷ 1 mol of H₂O)

H = 0.1557 mol

Step 2: Calculate the Smallest whole number ratio as,

C H

0.1954 0.1557

0.1954/0.1557 0.1557/0.1557

1.25 1

Multiply ratio by 4,

5 4

Result:

Empirical Formula of Propane is C₅H₄

Step 3: Calculate Molecular Formula:

Molecular formula is calculated by using following formula,

Molecular Formula = n × Empirical Formula ---- (1)

Also, n is given as,

n = Molecular Weight / Empirical Formula Weight

Molecular Weight = 128.0 g.mol⁻¹

Empirical Formula Weight = 5 (C) + 4 (H) = 64 g.mol⁻¹

So,

n = 128.0 g.mol⁻¹ ÷ 64 g.mol⁻¹

n = 2

Putting Empirical Formula and value of "n" in equation 1,

Molecular Formula = 2 × C₅H₄

Molecular Formula = C₁₀H₈

4 0

3 years ago

Calculate the frequency if the wavelength of energy is 6.5 x 10^-7m

melamori03 [73]

The answer to the problem is
69.55

5 0

3 years ago

THIS IS OVER DUE I NEED HELP PLEASE.

Ket [755]

If drinking coffee makes you shorter, than you should try to limit your coffee intake.

7 0

3 years ago

An ionic bond can be formed when one or more electrons are 1) equally shared by two atoms 2) unequally shared by two atoms 3) tr

Lyrx [107]

Answer:

4) transferred from the valence shell of one atom to the valence shell of another atom

Explanation:

Electrons are located outside of the nucleus which contains the protons and the neutrons.

For bonds to form, valence electrons located in the outermost shell electrons are involved. These are the valence electrons. These outer shell electrons can be shared or transferred between two combining atoms to form stable atoms.

In ionic bonds, the electrons are transferred from one specie to another. The atom that loses the electrons becomes positively charged and the receiving atom becomes negatively charged. This is the crux of ionic bonds.

6 0

3 years ago