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patriot [66]
3 years ago
9

Robert Hooke was the first person to observe cells. He observed these cells in

Biology
1 answer:
saveliy_v [14]3 years ago
6 0

Robert Hooke was the first person to observe cells. He observed these cells in (a) a piece of cork.

I hope this helps!

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Cuantos nucleotidos diferentes se pueden formar
tia_tia [17]

Hay cuatro tipos diferentes de nucleótidos de DNA: adenina (A), timina (T), guanina (G), citosina (C).
3 0
3 years ago
A usable dilution of disinfectant is one that prevents growth of bacteria when compared with the positive control tube. reduces
dolphi86 [110]

When compared to the positive control, a disinfectant dilution is considered to be useful if it stops bacterial growth.

Choosing a disinfectant:

When selecting a disinfectant, keep the following things in mind:

  • The range of bacteria that need to be eliminated. Look into the specifications of the manufacturers.
  • The conditions of usage of disinfectant.

Application of disinfectants :

  • Activity: it is necessary for efficient disinfection since, once diluted, it degrades over time. Different disinfectants deteriorate at different rates. Obtain data from the manufacturers. Disinfectants that don't have a color indication, like Virkon, should be marked with an expiration date.
  • Touch time: it has to be verified that the manufacturer's data to make sure the organism stays in contact for the specified amount of time. Considering that solid materials like cells and tissue granules are difficult for disinfectants to penetrate, autoclaving would be a more effective way to inactivate.

Therefore the correct choice is an option (A).

Learn more about disinfectants here:

brainly.com/question/26199691

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7 0
2 years ago
Ape species began to dwindle during the Miocene, leaving only a few remaining: a situation that exists up to the present. It is
fiasKO [112]

The change in weather pattern caused forest to become sparse and hot weather caused the reduction of apes as they had less food and difficulty in surviving the climate.

Explanation:

In Miocene epoch volcanic mountain chains were created in Central Africa which abruptly changed the local weather.

The sea-level got drop due to global cooling of that time.

This resulted in continental drift making land connection of Africa with Eurasia.

The primates started migrating through this route.

The African forest become dry causing selective pressures in primates.

The cooler climate in Eurasia caused extinction and migration of primates to Africa in late Miocene epoch.

The hot and humid climate and less woodland caused a reduction in number of apes which were replaced by modern world monkeys.

7 0
3 years ago
Gel electrophoresis is normally set up with the negative electrode at the top of the gel and the positive electrode at the botto
vredina [299]

Answer:

B) All DNA molecules will migrate up the gel toward the positive electrode.

Explanation:

Because the DNA has a negative charge - regardless the size-, all DNA molecules will migrate towards the positive electrode, at the top of the gel. This is due to the Coulomb's physic law  "force of the interaction between the charges is attractive if the charges have opposite signs".

Instead of migrate down the gel , the DNA will do migrate up the gel (opposite direction).

4 0
3 years ago
Reflections <br><br><br> 1-c <br> 2-d<br> 3-d<br> 4-c<br> 5-a
Mazyrski [523]

Answer:

1-C............. ...............

5 0
2 years ago
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