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netineya [11]
2 years ago
8

dna is made of two chains of nucleotides. which type of bonds hold the chains together? hydrogen bonds covalent bonds ionic bond

s polar covalent bonds
Biology
2 answers:
muminat2 years ago
8 0
<span>The correct answer is option A. Hydrogen bonds keep the two strands of DNA together by binding the nucleotides together. The hydrogen binding is repsponsible for the stability of DNA. The N-H bonding is the reason behind this between nucleotides base pairs of the DNA.</span>
Virty [35]2 years ago
7 0
<span>The appropriate response is hydrogen bonds. It is a feeble bond between two particles coming about because of an electrostatic fascination between a proton in one atom and an electronegative iota in the other. Intermolecular hydrogen holding is in charge of the high breaking point of water (100 °C) contrasted with the other gathering 16 hydrides that have significantly weaker hydrogen bonds.</span>
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imagine a cell-surface receptor protein is being newly synthesized. How can it get into the membrane that it will ultimately be
motikmotik

Answer:

the steps for a new receptor synthesis:

Explanation:

Do not forget the steps vary from an eukarityc cell to prokarityc one.  

IN AN EUKARYOTIC CELL:

1- Transcription: in the nucleus, mRNA is synthesized from the DNA sequence that codifies the protein. Exons are spliced if needed by spliceosomes.  

2- From nucleus into cytoplasm: mRNA goes through nuclear membrane into the cytoplasm were ribosomes, substrates for protein synthesis and other organelles are.

3- Ribosomes recognize a signal in mRNA and start reading the genetic code, three consecutive nucleotides at a time and adjust the correspondent tRNAs (tRNAs carry the aminoacids)  

4- Peptide bonds are formed between consecutives aminoacids, and a polypeptide is build up according to the mRNA sequence.

5- (The mRNA has a signal that is recognized by the rough endoplasmic reticulum) The peptide goes into this reticulum (RER) and then into Golgi apparatus. (more chemical modifications are made if needed). By this moment the protein has an inserted portion in a lipid membrane.

6- The protein is transported in a vessel that finally fusions with cytoplasmic membrane and the receptor is in destiny. Hydrophobic aminoacid sequences are inserted in membrane.

IN A PROKARYTIC CELL:

1- Transcription (no splicing is needed, there are not exons)

2- There are not nucleus and cytoplasm divided (no transport)

3- Ribosomes recognize a signal in mRNA and start reading the genetic code, three consecutive nucleotides at a time and adjust the correspondent tRNAs (tRNAs carry the aminoacids)

4- Peptide bonds are formed between consecutives aminoacids, and a polypeptide is build up according to the mRNA sequence.

5- The mRNA has a signal that is guides the growing protein to cellular membrane. Hydrophobic aminoacid sequences are inserted in membrane.

8 0
2 years ago
Did you remind the predicted phenotype ratio and children of dihybrid parents that are both right-handed and posses free ear lob
kirill115 [55]
Did you remind<span> the </span>predicted phenotype ratio<span> and </span>children<span> of </span>dihybrid parents<span> that are </span>both right-handed<span> and </span>posses free ear lobes<span> - 2159873.</span>
5 0
3 years ago
For each of the following nitrogenous base sequences, write the complimentary sequence on the line provided.
azamat
A) TAGGATCTTCCA
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tensa zangetsu [6.8K]

Answer: The structure of the spinal cord can be described as consisting of all the above named.

Explanation:The spinal cord is the main pathway for information connecting the brain and peripheral nervous system. Much shorter than its protecting spinal column, the human spinal cord originates in the brainstem, passes through the foramen magnum, and continues through to the conus medullaris near the second lumbar vertebra before terminating in a fibrous extension known as the filum terminale.

It is about 45 cm (18 in) long in men and around 43 cm (17 in) in women, ovoid-shaped, and is enlarged in the cervical and lumbar regions.

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3 years ago
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