Review M4

The most accepted theory is that viruses come from:

Answer explanation

The most accepted theory is that viruses come from the outer space since they are so different from the life we know here on earth

All fungi require at least 1 cell

• True

• False

Answer explanation

Fungi can be unicellular or multicellular microorganisms, so some of them can need 1 cell to function and others need more than that

Which are the 3 types of microorganisms that can be present in food?

Answer explanation

Bacteria, fungi and virus.

They can be present in food and either make humans sick or make the food itself "sick" and rotten it

Are viruses alive?

• No

• Yes

Answer explanation

Viruses do not fulfill the characteristics to classify that something is alive

How many cells compose a bacteria?

• 2

• Millions

• 1

• 20

Answer explanation

Bacteria are unicellular microorganisms, which means that one cell is the whole organisms itself.

If you have many cells, then you have many bacteria organisms.

Which of the following is NOT a characteristic from a living being?

• It reproduces itself or with the same specie

• React to stimuli

• Their cells need a nucleus

• Have cellular internal structure

Answer explanation

Living beings need to fulfill 6 characteristics:

-order

-sensitivity

-reproduction

-growth

-homeostasis maintenance

-energy from metabolism

If an organisms doesn't fulfill all of these, it's considered non-alive

There cannot be bacteria in extreme environments like glaciers

• True

• False

Answer explanation

Bacterias are present everywhere in our planet, so much that there's evidence of bacteria present in side glaciers or very close to volcanoes.

Only place where it's "impossible" for fungi to grow

Answer explanation

Waterbodies such as the ocean or rivers

Pathogens can kil...

• Humans

• Humans and plants

• Humans, plants and animals

• Plants and animals

Answer explanation

There are different pathogens for plants and animals (including humans), and from there there are ones that infect only certain species

What does the media do in a petri dish?

• Hold the microorganisms

• Feed the microorganisms

• Help scientist see the microorganisms