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sesenic [268]
3 years ago
11

If we have a plate that has 2500 colonies on it, can we use this plate to calculate CFU's

Biology
1 answer:
AleksAgata [21]3 years ago
6 0

No, the solution with bacteria in it needs to be diluted in order to be in the range of 30 – 300.

A colony-forming unit –CFU is used to estimate the number of viable (ability to divide by binary fission) microbes in a sample.  

A sample of microbes is diluted and spread on a plate. Then, the number of colonies is counted, assuming that each colony have grown from a single colony-forming unit, or CFU.

Plates with more than 300 colonies are difficult to count while those with less than 30 colonies give statistically unreliable numbers of colonies to count.

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With a suitable diagram explain reflex action and reflex arc
iren [92.7K]

Answer:

Reflex action is the sudden uncontrolled reaction towards a certain stimuli eg response to hot iron

Reflex arc is the path taken by reflex action to a certain stimuli

Diagram depends to

Receptor(eg skin), receptor nerve(sensory neurone),centre reflex arc(spinal cord most of reflex action) they met relay neurone, motor neurone and ends at reflexor (eg muscle)

7 0
3 years ago
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Which statement regarding the relative ages of rocks and events is
taurus [48]

Answer:

C. Faults are younger than the youngest layer they cut through.

Explanation:    

<em> A. Intrusive rock is older than the surrounding rock layers. </em>WRONG. The intrusive rocks are those that solidify underground and always form after the ones around them. So they are younger than the surrounding rocks.

<em>B. A fold is older than the oldest rock layer it contains. </em>WRONG. First, layers are set, and then, it occurs the folding. The folding is always younger than the involved layers.  

<em>C. Faults are younger than the youngest layer they cut through.</em> RIGHT. A fault is a cut through different layers that occurs when the sedimentary rock breaks transversally. It occurs always after the sedimentary rock is already formed. So the fault is always younger than all the layers it cuts through.

D. Rock layers that have been overturned are oldest from the base to the surface. WRONG. If <u>overturned</u>, according to the superposition low, layers are oldest from the surface to the base. Superposition law states that during the sedimentary rock formation, the oldest layer is always that one at the bottom, while the younger layer is the higher one.

4 0
3 years ago
Which is the number 1 reason for loss of biodiversity.
Vinil7 [7]

Answer:

B. Habitat destruction

Explanation:

What is the number one cause of biodiversity loss? 1. Habitat destruction. Habitat destruction is a major cause of biodiversity loss.

8 0
2 years ago
Do genes determine specific traits in an organism
OverLord2011 [107]

Answer:

Yes

Explanation:

Do your traits and your parents traits

3 0
3 years ago
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