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3 years ago

In 1953, Stanley Miller and Harold Urey built a model of Earth's early

Biology

1 answer:

romanna [79]3 years ago

4 0

Answer:

There results pointed out that it was possible for organic molecules to be produced under some reducing conditions which are similar to the primitive earth.Specifically they deduced that volcanic eruption occurring simultaneously with the lightning may have been responsible for the production of large quantities of some biological molecules on the early earth.

However, objection was raised to the claim that, NH3 and CH4 used in the experiment were the most abundant gases of primitive earth. Inert Nitrogen and Carbon were the prevalent gases of the early earth,nullifying the authentication of the experiment.Thus their experiment was wrong.

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Which is an example of an insertion mutation that changes all of the amino acids that follow the mutation?

astra-53 [7]

Answer:

2) CAG - TTC - ACG mutates to CAG - TTC - ACC - ACG

Explanation:

Insertions are mutations in which extra base pairs are inserted into a new place in the DNA. The number of base pairs inserted can range from one to thousands!

In option no. 1: We see that there is not addition of a single or more than one base, but the new base sequence is different from the original sequence at three places i.e: TTA - CAC - G

In option no. 2: The insertion of three bases ACC has been made exactly after TTC, the whole sequence and arrangement of bases remain same except this insertion.

In option no. 3: The first base of the sequence T is replaced with A, and all other sequence is same. This type of mutation is called substitution in which one base is replaced by other.

In option no. 4: The last base of the sequence C is deleted, and is not present in new sequence. This type of mutation is called deletion in which a base is removed from the sequence.

Conclusion: Therefore, the best option is 2, in which whole codon is inserted in the DNA base sequence.

7 0

3 years ago

Read 2 more answers

How do C4 plants ensure photosynthetic efficiency?

Lera25 [3.4K]

Answer:

In C4 photosynthesis, where a four-carbon compound is produced, unique leaf anatomy allows carbon dioxide to concentrate in 'bundle sheath' cells around Rubisco. This structure delivers carbon dioxide straight to Rubisco, effectively removing its contact with oxygen and the need for photorespiration

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3 years ago

What is the process in which matter changes from a gas to a

ryzh [129]

Answer: deposition

Explanation:

Deposition. The opposite of sublimation is deposition. This is the process in which a gas changes directly to a solid without going through the liquid state.

7 0

3 years ago

The basic building block of life is _____. the cell the atom the organelle DNA

MrMuchimi

The correct answer is a cell.

The basic life building block is the cell.

The cell is termed as the biological, functional and structural unit of every living organisms. They are referred to as building blocks.

Cell biology is the study of cell. Cytoplasm is being found in the cell which is enclosed in a membrane. The biomolecules which are contained in a cell include nucleic acids and proteins.

There are organisms which contains single cell for example, bacteria and those which are multicellular for example, animals and plants.

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3 years ago

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The karyotype indicates a problem with chromosome 18. What is the problem and what is the BEST explanation for why it occurred?

allochka39001 [22]

Answer:

C) extra chromosome; nondisjunction

Explanation:

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3 years ago