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MArishka [77]
3 years ago
7

In the double-stranded DNA molecule, base pairs between two strands are linked by __________.

Biology
1 answer:
lianna [129]3 years ago
4 0

Answer:

B. Hydrogen bonds

Explanation:

Hydrogen bonds are the weak attractive bonds that are formed between a partially positive hydrogen atom and an electronegative atom carrying a partial negative charge.

The nitrogenous bases of two strands of a DNA double helix are held together by hydrogen bonds. Adenine forms two hydrogen bonds with thymine base while guanine forms three hydrogen bonds with cytosine base.

These hydrogen bonds between the complementary nitrogenous bases of a double helix hold the two strands of DNA together.

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Explanation:

The real magnitude of this challenge can perhaps be best judged by considering the structural and functional complexity of the human brain and the bewildering complexity of human behavior. The human brain is thought to be composed of about a hundred billion (1011) nerve cells and about 10 to 50 times that number of supporting elements or glial cells. Some nerve cells have relatively few connections with other neurons or with such effector organs as muscles or glands, but the great majority receive connections from thousands of other cells and may themselves connect with several hundred other neurons. This means that at a fairly conservative estimate the total number of functional connections (known as synapses) within the human brain is on the order of a hundred trillion (1014). But what is most important is that these connections are not random or indiscriminate:

They constitute the essential "wiring" of the nervous system on which the extraordinarily precise functioning of the brain depends. We owe to the great neuroanatomists of the last century, and especially to Ramón y Cajal, the brilliant insight that cells with basically similar properties are able to produce very different actions because they are connected to each other and to the sensory receptors and effector organs of the body in different ways. One major objective of modern neuroscience is therefore to unravel the patterns of connections within the nervous system—in a word, to map the brain.

4 0
3 years ago
which technique uses an enzyme to replicate dna regoins from a small sample of dna for use in dna finger printing
Angelina_Jolie [31]
Short tandem repeats. STRs are analyzed using polymerase chain reaction (PCR), a technique for mass-producing sequences of DNA.
3 0
3 years ago
When antibodies are produced by lymphocytes, the body is conducting adaptive, passive, or innate immunity.
Leona [35]
Adaptive immunity.

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3 0
3 years ago
The bones that mainly form the orbital margin The bones that mainly form the orbital margin are​
s344n2d4d5 [400]

Answer:

it is the frontal bone The superior bony margin of the orbital rim, otherwise known as the orbital process, is formed by the frontal bone.

8 0
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Organisms that use energy from the sun to make their own food are called A) carnivores. B) consumers. C) omnivores. D) producers
DochEvi [55]
D) Producers they make their food from sunlight. :3
3 0
3 years ago
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