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2 years ago

What is the main difference between negative feedback and positive feedback?

1 answer:

5 0

The answer is the first choice:
Negative feedback reverses a change in a variable that has moved outside of its normal range, whereas positive feedback strengthens it.

Feedback loops do not only apply to blood pressure. There are many examples from body temperature regulation to child birth to your AC unit at home.

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Hitchhiker's thumb (H) is dominant to no hitchhiker's thumb (h). A woman who does not have hitchhiker's thumb marries a man who

Papessa [141]

Answer:

I'm assuming that the woman could have Hh or HH since they don't specify

If the woman has HH, all the children will not have a hitchhiker's thumb

if the woman has Hh the offspring could have either Hh, Hh, or hh

pls make me brainliest :) thx

5 0

3 years ago

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

3 years ago

in chickens, black feathers are dominant to white feathers. create a punnett square for a cross between two chickens that have b

faust18 [17]

the offspring has a 50% chance of having black feathers and a 50% chance of white feathers

6 0

3 years ago

When DNA ladder's rungs are the same width, why do A-T and G-C form complementary base pairs according to Chargaff's rule

Ronch [10]

Option C. the larger A pairs with the smaller T, and the larger G pairs with the smaller C.

5 0

3 years ago

WHy is water important to life?

Radda [10]

Answer:

At heart, all life on Earth uses a membrane that separates the organism from its environment. ... In this regard, water is essential simply because it's a liquid at Earth-like temperatures. Because it flows, water provides an efficient way to transfer substances from a cell to the cell's environment.

8 0

3 years ago