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LenaWriter [7]
3 years ago
10

What are introns and exons?

Biology
1 answer:
drek231 [11]3 years ago
6 0

An intron is a segment of a DNA or RNA molecule that does not code for proteins and interrupts the sequence of genes.


A exon is a segment of a DNA or RNA molecule containing information coding for a protein or peptide sequence.

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What did Mendel call plants that always produce the same color of flowers when allowed to self pollenate
Kamila [148]

Hello!

The answer to this question is;  A

Mendel had true-breeding pea plants that, if allowed to self-pollinate, would produce offspring identical to themselves.

Have a good day :)

3 0
3 years ago
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For many years, scientists believed that almost all animal lineages burst into being during the Cambrian era (just after the end
frosja888 [35]

Answer:

Option (A)

Explanation:

The Precambrian represents the time period, right from the beginning of the earth to about 540 million years back. It is divided into 3 parts, namely the Hadean, the Archean and the Proterozoic. Throughout this geological time, vast changes have taken place on earth. The first life forms of about 3.8 billion years old, that existed on earth were the simple unicellular organisms, whose traces were only found at some particular places. These organisms were very small and are comprised of soft bodies, so they were affected by the earth's dynamic processes. The organisms in order to get fossilized must contain hard parts. Due to the presence of soft bodies, the organisms were not fossilized and so it took a long time to demarcate that the late Precambrian organisms were animal-like life.

hence, the correct answer is option (A).

6 0
3 years ago
Common structures in different species may preform different jobs but they may look similar in structure
Hoochie [10]

Homologous structures are common structures in different species that perform different functions and may have look similar in structure.

Example- The different animals have bones that appear very similar in form and function and seem to be related.

3 0
3 years ago
An individual running a marathon may experience periods of oxygen deprivation that can lead to
Harman [31]

Answer:

A. anaerobic respiration in muscle cells, forming lactic acid

Explanation:

Running marathon is a vigorous exercise, which often leads to excessive use of oxygen in the cells of the athlete. This causes the cells to switch from the aerobic (with oxygen) to the anaerobic (without oxygen) mode of respiration. This anaerobic respiration produces a product called LACTATE OR LACTIC ACID.

The lactic acid becomes excessive and gets stored in the muscle cells of the athlete. This often leads to cramps, muscle pulls etc. during the marathon. Therefore, an individual running a marathon may experience periods of oxygen deprivation that can lead to anaerobic respiration in muscle cells, forming lactic acid.

8 0
3 years ago
Which of the following conditions will result in the lowest rabbit population?
Evgen [1.6K]

Answer:

B.

Explanation:

I believe that grey check mark beside B. indicates that is the correct answer.

4 0
3 years ago
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