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Kay [80]
3 years ago
11

The two complementary strands of DNA are held together by

Biology
2 answers:
Alexxandr [17]3 years ago
7 0
The two complementary strands of DNA are held together by Hydrogen bonding. 
Zarrin [17]3 years ago
6 0
<span>DNA strand and its complementary strand are held together by hydrogen bonds. A "G" (guanine) base on one strand will always be bonded to a "C" (cytosine) on the opposite strand by 3 hydrogen bonds. An "A" (adenine) base on one strand will always be bonded to a "T" (thymine) on the opposite strand by 2 hydrogen bonds.</span>
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Is a river an abiotic or biotic factor
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It’s an abiotic factor because it’s not living.
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Why are flanking sequences important for amplifying str fragments
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very STR has multiple alleles, or variants, each defined by the number of repeat units present or by the length of the sequence. ... Flanking regions are important because knowing their sequences enables geneticists to isolate the STR using polymerase chain reaction, or PCR, amplification.

Explanation:

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What is the best description of chromosomes by the end of metaphase II of meiosis
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There are two properties that affect the conduction speed of an action potential along an axon: die axon's diameter and whether
Rom4ik [11]

Answer:

 Axons with high  diameter, and myelinated will conduct action potential faster.

Axons with low diameter but myelinated will be  relatively  slow in the speed of action potential transmission

Axons with high diameter and unmyelinated will be relatively slow in action potential transmission.  

Axons with low diameter, and unmyelinated will conduct action potential slowly .

Explanation:

Diameter of Axon affects conduction speed of Action Potential; the thick axons with  high diameter conducts action potential at a faster speed than thin neurons. This is because of the less resistance to the transmission of action potential along the thick axon. However, thin neurons with   lower diameter has more resistance to the action potential conduct along the axon, thus the speed of transmission is slow.  

Myelinated neuron transmits action potential faster because of   jumping of action potential at the nodes of Ranvier where there is highest concentration of all channel proteins and pump proteins, Therefore action potential is conducted at a faster rate as it jumps from one node to another. This is salutatory conduction. It increases the conduct about 50 times compare to unmyelinated neuron. In neuron of human it increases the speed to 100ms-1

.Conversely, unmyelinated neurone  conducts action potential slowly. About 0.5ms-1 . This is because no salutatory conduction takes place because there is no myelin interruption as Nodes of Ranvier

3 0
3 years ago
The medial pathway, which controls gross movements of the head, trunk, and limbs, consists of which tracts
Gemiola [76]

The medial pathway, which controls gross movements of the head, trunk, and limbs, consists of tectospinal, reticulospinal and vestibulospinal tracts.

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The vestibulospinal tract is a neural tract found in the central nervous system. It is specifically also a component of the extrapyramidal system and is a classified component of the medial pathway. The vestibulospinal fibers of the tract relay information from the nuclei to the motor neurons which is the same with the other descending motor pathways.

Lastly, the reticulospinal tracts or the descending or anterior reticulospinal tracts are extrapyrimidal motor tracts that goes down from the reticular formation in two tracts to act on the motor neurons supplying the trunk and the flexors and extensors of the proximal limb.

3 0
3 years ago
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