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emmainna [20.7K]
3 years ago
14

Explain how covalent bonds and hydrogen bonds hold together a strand of DNA

Biology
1 answer:
Lilit [14]3 years ago
3 0

Answer:

Covalent bonds appear inside every linear chain and connect bases, sugars, and phosphate groups.

Hydrogen bonds appear between two strands and involve the base from one strand with the base from another strand in the complementary pairing.

Explanation:

A covalent bond is a chemical bond formed by joining electrons of two non-metal atoms into one or more common pairs.

A hydrogen bond (X-bond) is a type of weak chemical bond based on electrostatic attraction between a hydrogen atom and a nucleophilic atom that contains free electron pairs.

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Answer:

Anatomy supports the theory of evolution because some species share similar physical features that was present in a common ancestor.

An example of shared anatomy is sharks and dolphins. types of analogous structures, such as dolphins and sharks, do not prove species are related, but rather they support the Theory of Evolution by show how species do build up adaptations in order to fit into their environments

Molecular biology because DNA and the genetic code reflect the shared ancestry of life. DNA comparisons can show how related species are.

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Explanation:

6 0
3 years ago
If poison is suspected in the deaths, how would you proceed with the investigation?
Leviafan [203]
A tox screen I think
8 0
3 years ago
Nondisjunction could occur during ________.
DedPeter [7]

Nondisjunction could occur during - Anaphase ii

<h3>What is Nondisjunction ?</h3>

Nondisjunction occurs when the chromosomes do not separate. In this case, gametes are produced with an abnormal number of chromosomes. It is an abnormal number of chromosomes in all  cells called aneuploidy or in some cells called mosaicism.

Example ; Down's syndrome, Trisomy of autosomes.

Anaphase is the 3rd stage of cell division process specially after the metaphase in mitosis. In this step sister chromatids gets seperated from each other and pulls towards the cell's ending portion.

specially in Anaphase 2 chromatids splits at the centromere and pulled to the spindle fibres.

To know more about the Anaphase please click here :

https://brainly.ph/question/33956?

#SPJ4

8 0
2 years ago
Which of the following is true about soil color? a. A dark color indicates that the soil is poor in organic matter. b. Bright ye
777dan777 [17]
The only one correct answer would be:

c. Yellow or red hues in the soil indicate the presence of iron or aluminum. 
5 0
3 years ago
Read 2 more answers
What binds with blood types A, B, AB, and O?<br><br> thank you!
Pani-rosa [81]

Explanation:

AB blood type is very rare

thank you!

3 0
3 years ago
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