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ELEN [110]
3 years ago
9

20. Many years 90, scientists working with cells developed what is now known as the

Biology
1 answer:
serious [3.7K]3 years ago
8 0

Answer:

By the late 1830s, botanist Matthias Schleiden and zoologist Theodor Schwann were studying tissues and proposed the unified cell theory. The unified cell theory states that: all living things are composed of one or more cells; the cell is the basic unit of life; and new cells arise from existing cells

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Introns in pre-mRNA: a. protect pre-mRNA from enzyme degradation. b. move within the mRNA, giving rise to new exon combinations.
suter [353]

Answer: c. are spliced out of the message.

Explanation: Intron are non-coding portion of the DNA sequence. They do not code for any specific amino acid and are spliced or removed before splicing.

Exons are DNA sequence that code for specific amino acid they are usually left after introns are removed and are joined together before translation into amino acid sequence. Intron splicing can lead to splicing some exons which can lead to formation of an entirely new amino acid or protein.

Spliceosome are enzymes for splicing introns.

7 0
2 years ago
Genetic drift and natural selection can both be mechanisms of evolution. However, they are very different mechanisms.
Lina20 [59]

Answer:

The key distinction is that in genetic drift allele frequencies change by chance, whereas in natural selection allele frequencies change by differential reproductive success

Explanation:

Hope this helps

PLEASE MARK AS BRAINLIEST !!!

3 0
3 years ago
This change from fins on the love-finned fish to legs and feet on the early amphibian is most likely due to:___________.
shusha [124]

Answer:

<h2>4</h2>

Explanation:

Lobe-finned fishes are bony fish, having fleshy, lobed, paired fins, these fins are joined to the body by a single bone only . The fins of these lobe-finned fishes differ from all other fishes in many ways, Lobe-finned fish lived in water.

By the passage of time, from fin on lobe-finned fish changed to legs and feet on the early amphibians due to variations among offspring, followed by natural selection. These  legs and feet containing amphibians lives both in water and land.

4 0
3 years ago
In your own words, describe the base-pairing rules in any DNA molecule.
Elenna [48]
The base pairing rules in any DNA molecule are these:

• Adenine always pairs with Thymine(A-T)

• Cytosine always pairs with Guanine (C-G)
3 0
3 years ago
Read 2 more answers
Which picture below shows an atom with 4 valence electrons?
Nikolay [14]

Answer:

Be

Explanation:

its B bc theres 4 elections

3 0
3 years ago
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