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3 years ago

When NADH passes its electrons into the Electron Transport System, NADH is chemically:

Biology

1 answer:

erik [133]3 years ago

8 0

Answer:

Option D, oxidized

Explanation:

The NADH gets oxidised when it passes its electrons into the Electron Transport System

Oxidization is a process in which one element or compound loses its electron to other chemical element or compound thereby itself getting oxidised and reducing the other one (the one who gains the electron).

Here in the electron transport system, the NADH loses or donates its electron to the Electron Transport System thus chemically it gets oxidized.

Hence, option D is correct

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A gene can have many alleles. Why is it that any given person only carries two copies of each allele

Katyanochek1 [597]

Since diploid organisms have two copies of each chromosome, they have two of each gene. Since genes come in more than one version, an organism can have two of the same alleles of a gene, or two different alleles. This is important because alleles can be dominant, recessive, or codominant to each other.

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3 years ago

What was the size of the Krakatau explosion probably the result of?

mr_godi [17]

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3 years ago

How does the human body respond to exercise

Oduvanchick [21]

Answer:

the breathing rate with volume of each breath increases to bring more oxygen into the body and remove the CO2 produced. the heart rate then increases, to supply the muscles with extra oxygen and remove the carbon dioxide produced often in the form of exercise.

Explanation:

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3 years ago

PLEASE ANSWER ASAP!

OverLord2011 [107]

Answer: The Earth's continents are in constant motion. On at least three occasions, they have all collided to form one giant continent. If history is a guide, the current continents will coalesce once again to form another supercontinent. And a study in Nature now shows how that could come about.

You can think of continents as giant puzzle pieces shuffling around the Earth. When they drift apart, mighty oceans form. When they come together, oceans disappear. And it's all because continents sit on moving plates of the Earth's crust.

Then, Now And Future

A new model of continental drift predicts that the next supercontinent could form near the North Pole — in another 100 million years or so.

Two of the previous supercontinents, which formed 200 million years ago (Pangaea) and 800 million years ago (Rodinia).

Mitchell, et. al./Nature

The Americas and Asia may fuse together to form a new supercontinent, "Amasia."

Mitchell, et. al./Nature

"Continents on these plates typically move, I would say, at the rate your fingernails grow," says Ross Mitchell, a graduate student at Yale University. That may seem slow, but it adds up over hundreds of millions of years.

Look at an atlas and you can imagine how Africa and South America, for example, once nestled together.

"Rewind the tape and bring all the continents back into their jigsaw arrangement, you have this vast landmass of all the Earth's continental blocks together," Mitchell says.

Last time all the landmass clumped up, it formed a supercontinent called Pangaea. The dinosaurs walked there. But Pangaea wasn't the first.

"There had been three, possibly a debated fourth supercontinent through the billions of years," Mitchell says.

He has been studying that deep history by looking at tiny magnets buried in rock around the world. Those magnets pointed north when they were locked into the rock. Sample those magnets in layers of rock laid down over millions of years, and you can tell the story of how those continents have moved.

And naturally, that led Mitchell to wonder what the next supercontinent will look like.

There have been two leading ideas. One is that the continents will collapse together again at the site of the last supercontinent, centered on Africa. That would squeeze the Atlantic Ocean shut. The other idea is that the Atlantic would keep growing and growing.

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3 years ago

Can someone help me with this question I’m not getting it

RSB [31]

Answer:

a. $X^BY$

b. $X^BX^B$

c. $X^{b} Y$

d. $X^BX^b$

e. $X^bX^b$

Explanation:

There are two sex chromosomes, X and Y. A female has two X chromosomes and the male has an X and a Y. The genotype then for male and female woud be:

Female = XX

Male = XY

Now the superscript indicates the allele for a particular trait.

Based on what was given:

H is dominant (no hemophilia)

h is recessive (hemophilic)

B is dominant (no color blindness)

b is recessive (color blind)

As you can see in the given, the Y chromosome has no allele, this means that hemophilia and color-blindness is X-linked or dependent on the X chromosome.

For the first, it says normal male this means that the genotype would be XY , the X chromosome would have the normal dominant allele for color-blindness so that would be B.

$X^BY$

The next one would be homozygous normal female. This means that the female has both dominant alleles on their chromosome (BB)

$X^BX^B$

The third one says colorblind male. Unlike the females, the male chromosomes only need the X to be affected for them to express the trait. So in this case, the X will have the recessive allele for colorblindness (b).

$X^{b} Y$

The foruth one is a normal female for color-blindess but is heterozygous. This means that the female has the recessive allele, but the dominant trait masks it. So it will have both alleles (Bb)

$X^BX^b$

Lastly, a color-blind female would have to have two recessive alleles. This is what we call homozygous recessive (bb).

$X^bX^b$

5 0

3 years ago