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3 years ago

Which of the following may not have been possible without the presence of ozone in the atmosphere?

Biology

1 answer:

Basile [38]3 years ago

5 0

Answer: Option A) Oxygen may not have been able to accumulate in the atmosphere

Explanation:

Ozone, O3, is an allotrope of oxygen having three atoms in the molecule instead of the usual two present in molecular oxygen. Ozone is generated from oxygen, and is the only form in which oxygen can exist in the atmosphere.

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Refer to the chart of amino acid structures to help answer this question. Which four statements about amino acids are true? Ser

Bad White [126]

Answer:

1. Ser and Gln are polar amino acids.

2. The Leu side chain does not form hydrogen bonds with other amino acids.

3. Phe can undergo oxidation to form Tyr.

4. Lysine has one stereocenter (chiral center).

Explanation:

Serine and glutamine are the polar amino acids with uncharged side group. Serine has a "CH2OH" group as its side chain and the presence of hydroxyl group makes it a polar amino acid. Glutamine is one of the amides derived from other amino acids present in proteins.

Leucine is a nonpolar amino acid with an aliphatic side chain and tends to cluster within the proteins to stay away from the surrounding watery medium. Its aliphatic R group does not form any hydrogen bonds to other amino acids.

Phenylalanine is a nonpolar amino acid with an aromatic R group. Oxidation of aromatic R group of phenylalanine converts it into tyrosine which has an additional hydroxyl group in its side chain.

The chiral center is the carbon to which four different functional groups are bonded. The central alpha carbon atom of lysine is bonded to an amino group, carboxyl group, a hydrogen atom, and one positively charged R group which in turn makes it a chiral center.

4 0

3 years ago

The excerpt is from an article that Roberto read for science class called “Using the Scientific Method to Study Tomatoes.”

Mazyrski [523]

Answer:

The sample size is too small.

Explanation:

The process of elimination helped me find this answer.

It is possible to keep the conditions the same.

there are only 2 plants and one control, that's obviously not a lot.

and controls can be used on more than studying animals.

When using the scientific method you can use as many test subjects as you can so it can help you confirm. two plants are not a lot.

I've also had a teacher confirm that this is the correct answer.

edge 2020

6 0

3 years ago

Compare your results with those of other groups. How did the seeds respond to the temperature?(cold and room temperature) infer

galina1969 [7]

There are so many examples for that in different areas, like biology experiment carried out in our lab recently.

Here's one link: https://www.creative-biogene.com/Services/Custom-Viral-Service/Replication-Competent-Virus-Testing.html

7 0

3 years ago

baherus [9]

Condensation goes from a gas to a liquid and precipitation is when it rains

6 0

3 years ago

What is a group of cells working together called?

anyanavicka [17]

Salutations!

A group of cells working together are called tissues. Organisms are made up of this structure. Cells are the smallest unit of life. A group of tissues working together is called organ. A group of organs working together is called organ system. An organ system working together makes up an organism.

Hope I helped (:

Have a great day!

6 0

3 years ago