What are two main abiotic factors that affect organisms in marine ecosystems? A. Oxygen level and water temperature B. Predators and competition C. Salinity and water temperature D. Predators and food availability

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Answer 1
Answer:

Answer:

dear user the answer is option A.oxygen level and water temperature and C.salinity and water temperature.

hope this helps

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Answer 2
Answer:

Answer:

It would be A

Explanation:


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What is mitosis and how does it work?

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hey Mitosis is a fundamental process for life. During mitosis, a cell duplicates all of its contents, including its chromosomes, and splits to form two identical daughter cells. hope this helps

When wind drips its load of sand, it can form a hill called a

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Depositions of sand are called sand dunes. Hope this helps! :)
It's called a sand dune

Explain how electron microscopes work and why some scientists might prefer to use electron microscopes instead of light microscopes.

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Answer:

Electron microscopes differ from lightmicroscopes in that they produce an image of a specimen by using a beam of electronsrather than a beam of light. Electrons have much a shorter wavelength than visible light, and this allows electron microscopes to produce higher-resolution images than standard lightmicroscopes.

plz help 25 points 2.For the early evolutionary scientists, describe their work and contribution to the Theory of Evolution.​

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Answer:

1.Darwin

Explanation:

Charles Darwin. The first and arguably the most famous scientist with his evolution theory

How many hydrogen bonds will be involved in base pairing in a DNA molecule of 50 base pairs that contains 15 cytosine bases

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Answer:

The number of hydrogen bonds involved will be 39

Explanation:

There are 4 types of bases that exist in a DNA, which are adenine, thymine, guanine and cytosine. Double stranded DNA molecules have these bases attaching specifically to one another; adenine only binds to thymine and vice versa while guanine only binds to cytosine and vice versa. These two bases bonding together are referred to as base pairs and the type of bond here is the hydrogen bond. There are double bonds between the adenine and thymine base pair while there are triple bonds between the guanine and cytosine base pairs.

Thus, when there are 13 cytosine bases in a DNA molecule, the number of hydrogen bonds present in the resulting base pairs will be 13 × 3 (because cytosine binds with a triple bond to guanine).

13 × 3 = 39

The number of hydrogen bonds involved will be 39

Final answer:

So, in a DNA molecule of 50 base pairs that contains 15 cytosine (C) bases, there would be a total of 115 hydrogen bonds involved in base pairing.

Explanation:

In DNA, base pairing occurs between complementary nitrogenous bases. Adenine (A) pairs with thymine (T), and cytosine (C) pairs with guanine (G). Each base pair is connected by hydrogen bonds.

In a DNA molecule of 50 base pairs with 15 cytosine (C) bases, you can determine the number of hydrogen bonds involved in base pairing as follows:

1. Each adenine (A) pairs with thymine (T) and forms two hydrogen bonds.

2. Each cytosine (C) pairs with guanine (G) and forms three hydrogen bonds.

So, for the 15 cytosine (C) bases, you would have 15 pairs of C-G base pairs, and for the remaining 35 bases, you would have 35 pairs of A-T base pairs.

Total hydrogen bonds involved in base pairing:

(15 pairs of C-G base pairs * 3 hydrogen bonds per pair) + (35 pairs of A-T base pairs * 2 hydrogen bonds per pair)

= (15 * 3) + (35 * 2)

= 45 + 70

= 115 hydrogen bonds.

So, in a DNA molecule of 50 base pairs that contains 15 cytosine (C) bases, there would be a total of 115 hydrogen bonds involved in base pairing.

Learn more about Hydrogen bonds in DNA base pairing here:

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plzz help!!!, What phrase is spelled out in the eye chart? NOTE: your answer will be in all lowercase

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Answer: rna polymerase transcribes mrna