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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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Which structure of the cell controls what goes in and comes out of the cell?
belka [17]

Cell Membrane = Controls what comes into and out of a cell; found in plant and animal cells
3 0
3 years ago
Which statement regarding the relative ages of rocks and events is
taurus [48]

Answer:

C. Faults are younger than the youngest layer they cut through.

Explanation:    

<em> A. Intrusive rock is older than the surrounding rock layers. </em>WRONG. The intrusive rocks are those that solidify underground and always form after the ones around them. So they are younger than the surrounding rocks.

<em>B. A fold is older than the oldest rock layer it contains. </em>WRONG. First, layers are set, and then, it occurs the folding. The folding is always younger than the involved layers.  

<em>C. Faults are younger than the youngest layer they cut through.</em> RIGHT. A fault is a cut through different layers that occurs when the sedimentary rock breaks transversally. It occurs always after the sedimentary rock is already formed. So the fault is always younger than all the layers it cuts through.

D. Rock layers that have been overturned are oldest from the base to the surface. WRONG. If <u>overturned</u>, according to the superposition low, layers are oldest from the surface to the base. Superposition law states that during the sedimentary rock formation, the oldest layer is always that one at the bottom, while the younger layer is the higher one.

4 0
3 years ago
How do radiation and chemotherapy affect cancer cells?
elixir [45]

Answer:

They destroy the DNA or RNA

Explanation:

Cancer drugs work by damaging the RNA or DNA. The faster the cancer cells divide, the more likely it is that chemotherapy will kill the cells, causing the tumor to shrink. They also induce apoptosis. Radiation therapy is a cancer treatment that uses high doses of radiation to kill cancer cells and shrink tumors. The radiations also induce apoptosis. Cancer cells whose DNA is damaged beyond repair stops dividing and die. The damaged cells die, they are broken down and removed by the body.

7 0
3 years ago
What are some causes of cancer
andrew-mc [135]

Answer:

There are a bunch of things.

Explanation:

Smoking and Tobacco.

Diet and Physical Activity.

Sun and Other Types of Radiation.

Viruses and Other Infections.

Hope this helps!

6 0
3 years ago
Read 2 more answers
Wild animals are not considered a natural resource. Please select the best answer from the choices provided T F
stich3 [128]
The correct answer is F because they are here on earth natrully
5 0
3 years ago
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