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Anit [1.1K]
3 years ago
5

Which important event in Earth’s history occurred during the Jurassic period?

Biology
1 answer:
DIA [1.3K]3 years ago
5 0

Answer:

The start of the period was marked by the major Triassic–Jurassic extinction event. Two other extinction events occurred during the period: the Pliensbachian-Toarcian extinction in the Early Jurassic, and the Tithonian event at the end; neither event ranks among the "Big Five" mass extinctions.

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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:

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7 0
2 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
What effect does the size of an amino acid on the retention factor?
Anarel [89]

According to proteomic data analysis, the N-terminus residues highly influence the retention of amino acids due to their role in ion-pairing. Every amino acid has a retention coefficient factor depending on the N-terminus residues it contains. Therefore, the longer the amino acid the higher the likelihood of it having high N-terminus residues and consequent high retention co-efficient.  





6 0
3 years ago
Read 2 more answers
I’ll put you as brainliest 10points !
vredina [299]

Answer:

Part 1:D) Fertilization

Part 2: C) The process combines genes from two individuals into a distinct organism.

Explanation:

99% sure its correct

3 0
3 years ago
I’m stuck and need help please .
N76 [4]
12-A
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11-C
6-D
1-E
10-F
8-G
9-H
5-I
3-J
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3 years ago
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