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3 years ago

Please help me I will give you the brain thing and extra points. image below part 1

Biology

2 answers:

denis23 [38]3 years ago

5 0

Answer:

C. Release of Heat Energy

Reason:

-A chemical is any substance that has a definite composition

-A chemical reaction is the process by which one or more substances change to produce one or more different substances

-Matter is anything that has mass and volume

-Solids have fixed volume and shape

-Liquids have fixed volume, but not a fixed shape

-Gasses have neither fixed volume or shape

Evidences of Chemical Change:

1. Evolution of bubbles (gas) without a heat source

2. Formation of a precipitation (solids floating in a liquid)

3. Transfer of energy (it gets hot or cold)

4. Color change

In the part of the question, "They noticed that bubbles form, the test tube got hot, and the magnesium disappeared", it states nowhere about color change or change in odor.

lesantik [10]3 years ago

4 0

Answer:

B. change in color.

Explanation:

you can tell theres a reaction if there is a change in color, temperature and a production of odor

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Natasha2012 [34]

Answer:

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Explanation:

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3 years ago

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3 years ago

Why do resistant bacteria multiply faster after a patient has taken antibiotics compared to a healthy person who has not taken a

Alenkasestr [34]

Answer:

When patient takes in antibiotics the resistance bacteria gets a competitive survival advantage over the normal sensitive bacteria and hence grows faster.

Explanation:

Bacteria can acquire resistance by taking in plasmids containing MDR (Multi-Drug Resistance) gene cassettes. The MDR genes produces proteins that can:

Render the antibiotic ineffective to act on its target by inducing chemical modifications on the drug.
Promote efflux of the drug from the bacterial cell so that the drug cannot act upon its target.

When a healthy person ( having no prior exposure to the antibiotic) is infected by bacteria ( both sensitive and resistant varieties):

A competition develops for the host cells and nutrients between the sensitive and the resistant variety.
This mutual competition restricts either of the sensitive or resistant bacterial strain to grow profusely.

When a person (having prior antibiotic exposure), gets infected by bacteria ( both sensitive and resistant varieties) and is exposed to the same antibiotic:

The sensitive variety, due to its sensitivity towards the drug, gets killed.
The resistant variety, due to its MDR genes, bypasses the lethal effect of the drug and survives.
These surviving resistant bacteria can now infect all the available host cells and utilise all the available nutrients without facing any competition and multiply rapidly.

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4 years ago

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Nadusha1986 [10]

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4 years ago