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3 years ago

Why do the lungs have a large number of blood vessels?

Biology

2 answers:

Sonja [21]3 years ago

5 0

Because blood needs oxygen and thats where it gets the most of it

torisob [31]3 years ago

4 0

The lungs are the source of oxygen for the blood, and the blood vessels pass through it in order to exchange the Carbon dioxide that has been produced through respiration, with fresh oxygen to transport to the muscles so respiration may continue.

There are a large number because a larger surface area means more diffusion can occur, and we want the gas exchange to occur as quickly as possible, so when you're working hard and the muscles need more oxygen, this can be provided.

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In a PCR reaction, a few seconds at high temperature disrupts the ____ that hold the two strands of DNA together, so every molec

Andrews [41]

Answer:

Hydrogen Bonds

Explanation:

In the polymerase chain reaction (PCR) the temperature rises to 90 ° C - 95 ° C, to break the hydrogen bonds, which are the types of bonds responsible for pairing the two strands of DNA, this process is known as denaturation of DNA.

The DNA is extremely stable, due to a large number of bonds (hydrogen bonds) that form between the two strands. If the temperature decreases, these bonds will begin to recompose, until the DNA returns to its original state

7 0

3 years ago

PLEASE HELP: Why do we need 250 different kinds of cells?

AnnZ [28]

Because we do or we would die

7 0

3 years ago

Read 2 more answers

What is environment?

Tju [1.3M]

The surroundings or conditions in which a person, animal, or plant lives or operates.

The natural environment encompasses all living and non-living things occurring naturally, meaning in this case not artificial. The term is most often applied to the Earth or some parts of Earth.

8 0

3 years ago

Read 2 more answers

How many possible open reading frames (frames without stop codons) are there that extend through the following sequence? 5'... C

fenix001 [56]

Answer:

There are 4 reading frames without stop codons.

Explanation:

1) To find the possible reading frames you need to separate your sequence in codons (trios) for the 5'-> 3' sense, first, excluding the first nucleotide, then excluding 2 nucleotides and then not excluding nucleotides.

5'... C TTA CAG TTT ATT GAT ACG GAG AAG G... 3' NO STOP CODON

5'... CT TAC AGT TTA TTG ATA CGG AGA AGG... 3' NO STOP CODON

5'... CTT ACA GTT TAT TGA TAC GGA GAA GG... 3'

2)Then you find the complementary sequence (which you already have)

3'... GAA TGT CAA ATA ACT ATG CCT CTT CC... 5'

3'... GA ATG TCA AAT AAC TAT GCC TCT TCC... 5'

3'... G AAT GTC AAA TAA CTA TGC CTC TTC C... 5'

3) Next, you have to obtain the reverse complementary

CCT TCT CCG TAT CAA TAA ACT GTA AG NO STOP CODON

CC TTC TCC GTA TCA ATA AAC TGT AAG NO STOP CODON

C CTT CTC CGT ATC AAT AAA CTG TAA G

4)Now you need to find start (AGT in terms of DNA) and stop codons(TAA, TAG, TGA, also in terms of DNA), in 5->3 and de reverse complementary.

As you can see, you have for open reading frames that lack of stop codon, unfortunately, they also lack of AGT, the start codon.

I added a table where you can find thestart and stop codons as well as the proteins that they translate to in terms of RNA.

I hope you find this information interesting and useful, good luck!

8 0

3 years ago

The cell membrane controls movement of materials into and out of the cell. The following particles are moving from high concentr

Scilla [17]

Answer:

the answer woiuld be b

Explanation:

6 0

3 years ago