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3 years ago

Provide three reasons why the use of aseptic technique is essential when handling microbial cultures

1 answer:

8 0

It is imperative to use aseptic techniques whe handling microbial cultures because aseptic techniques:
1. reduce contamination of your cultures from enviornment
2. reduce contamination/transfer of bacteria between different culture smears
3. helps to isolate a single microorganism to get a culture smear of

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What characteristics do the members of the four kingdoms of the four domain Eukarya have in common?

nikdorinn [45]

They all have a nucleus and membrane-bound organelles.
They can all be multi cellular.

(That's all I can think of :/ sorry for the lack of characteristics)

3 0

3 years ago

A new microorganism is isolated from a lake and is placed into a solution of KCl. The voltage difference across its membrane is

Leona [35]

Answer: $\Delta U=$ 1.922x10⁻²⁰ Joules

Explanation: Electric Potential Energy (U) is the energy a charged object has due to its location in an electric field and it will only exist with the object is charged.

Voltage or Electric Potential Difference (V) is external work done to move a charge from one point to another in a electric field.

These terms have a relationship, which is given by:

$\Delta U=q\Delta V$

where

q is the charge

Proton is positive and has a charge of 1.6x10⁻¹⁹C.

Unit for potential energy is Joule (J). The relation between mV and J is

1mV = 10⁻³J

Then:

V = 120x10⁻³

V = 0.12

So, for a proton to move from the negative side of a membrane to the positive:

$\Delta U=q\Delta V$

$\Delta U=1.6.10^{-19}.0.12$

$\Delta U$ = 1.922 x 10⁻²⁰

Energy necessary to transport a proton from negative side of the membrane to the positive is 1.922 x 10⁻²⁰J.

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3 years ago

How are solar energy, the weather, and the water cycle related?

Grace [21]

A. Solar energy drives both weather and the water cycle.

5 0

3 years ago

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Write a paragraph using all of the words above.

EastWind [94]

Answer:

Explanation:

Kindly download the attachment for the answer (a paragraph) to this question. All words requested are used and are underlined as appropriate (for tracking) and are detailed for personal understanding. Some of the words are necessarily repeated so as not to cause confusion with other preceding words.

Download docx

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3 years ago

If you could specialize yourself the way you want how would you make your self look

never [62]

Answer: Well I don't know it depends

Explanation:

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3 years ago

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