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DaniilM [7]
2 years ago
15

Dark skin ( a result of increased melanin production in equatorial populations), is likely a response to ultraviolet radiation b

ecause UV radiation causes:
Biology
1 answer:
AlladinOne [14]2 years ago
8 0

Answer: Skin cancer

Explanation:

Melanin is a pigment derived from an amino called acid tyrosine. The most common form of melanin is called eumelanin, which is a polymer of dihydroxyindole carboxylic acids and their reduced forms.<u> When a person is exposed to the ultraviolet light (UV) from the sun, the melanocytes will produce eumelanin to prevent the skin from burning and damage to the cell nuclei (where DNA is found)</u> of the epidermis. This melanin production causes the skin to darken. The eumelanin in the skin then acts as a natural sunscreen by blocking the damaging effects of sunlight. So, skin darkens when exposed UV light, thus providing greater protection when needed by producing more eumelanin, but it also becomes more likely to develop melanoma, which is a type of skin cancer. This is because UV rays damage the DNA of skin cells. <u>The DNA (deoxyribonucleic acid) is the genetic material that has the instructios to the growth and functioning</u> of an organisms). Skin cancers begin when eumelanin protection is not sufficient and this damage affects the DNA of the genes that control the growth of skin cells. <u>This results in a tumor, which is the uncontrolled growth of cells </u>(in this case, skin cells) because there will be a mutation in DNA that affects the function of the cells.

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Damage to a brain area called the _____ would MOST likely interfere with learning a conditioned fear response to the sight of a
ELEN [110]

Answer:

The options

A)hippocampus

B)basal ganglia

C)hypothalamus

D)cerebellum

The CORRECT ANSWER IS D)

D)cerebellum

Explanation:

Apart from the coordinating process, the cerebellum is involved in motor learning, emotional behavior, and fear memory.

Fear learning is widely shown in the variation of autonomic and somatic responses, as in heart rate and freezing, promoted by a neutral stimulus which could have been formally grouped with a painful one.

Variation or changes of the vermis influences these responses, and its reversible inactivation in the period of consolidation which is seen to impair fear memory.

The neural correlate of cerebellar activities in fear consolidation is shown by a behaviorally promoted long-term rise of synaptic effectiveness and efficiencies among parallel fibers and a Purkinje cell.

Likely synaptic variations after fear conditioning are well fully observed in the amygdala and hippocampus, suggesting an interplay among emotional circumstances of scenario and the different variations in neural process.

Furthermore, in hotfoot mice, that shows a basic lack of parallel fiber to Purkinje cell synapse, short- and long-term fear memories are influenced.

All these data gives a foundational background on the concept that the cerebellum is majorly involved in fear learning.

The functional interplay of the vermis with hypothalamus, amygdala, and hippocampus do infer to a more complex activities of the cerebellum as a form of an united network that basically influences emotional behavior.

8 0
3 years ago
Read 2 more answers
A mistake in DNA replication, in which the wrong base is placed in the growing DNA strand, can have profound effects on the desc
Klio2033 [76]

Answer:

DNA replication is the process in which the DNA is copied and it occurs during synthesis phase of the eukaryotic cell cycle. It begins with an enzyme breaking the bonds between complementary bases in DNA which exposes the bases inside  the molecules so they can be read by another enzyme and used to build two new DNA strands with complementary bases.

Explanation:

The original strand is: TAGCGTT

                                      ATCGCAA

The Mutated strand is: TGGCGTT

                                       ATCGCAA

<em>The replicated strand is: GAATCAC</em>

<em>                                           CTTAGTG</em>

5 0
3 years ago
Competition is a driving force behind natural selection. Which of these statements best describes why competition is a constant
kramer

Answer:

C

Explanation:

Remember that a niche is an inhabited areas where organisms essentially behave a little like humans each filling their own individual role. These aren't extremely common to find but the whole concept of it is that these organisms will function peacefully and trying to help one another survive. C is correct because with minimal resources you will lose that sense of tranquility and now fight it out for who is the fittest for the environment

Hope this helps!

7 0
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Something about weather plz help me I have the worst science teacher ever plz help me
miss Akunina [59]

Answer: 520

Explanation:

4 0
2 years ago
what do you think are some methods used to remove dirt and harmful substances from the water we drink?
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One way to remove dirt and harmful substances from water is by filtering.
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