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3 years ago

Select all that apply.

Biology

2 answers:

Misha Larkins [42]3 years ago

7 0

Answer:

The correct answer will be option c and e.

Explanation:

Van Helmont is known for his experiment on the plants. At his time it was believed that plants take energy from the soil by eating it so he grew the willow seedlings in the pot. he measured the weight of the pot and willow seedlings and used to water it for the next five years. he measured the weight of the soil and willow seedlings after five years and found that the weight of the tree increased but the weight of the soil remained the same.

He concluded that the plant grew because of the supplied water as there was no change in the mass of the soil. His results were partly correct as he was not aware of the process photosynthesis so did not mention the carbon dioxide which increased the mass of the tree.

Thus, option c and e are the correct options.

oksian1 [2.3K]3 years ago

3 0

I’d say the best answer is a and c

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Naily [24]

Answer:

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Explanation:

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3 years ago

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pshichka [43]

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BioTeacher101

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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.

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luda_lava [24]

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