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sertanlavr [38]
3 years ago
15

Chromosomes are made of and contain two identical chromatids.

Biology
1 answer:
Verizon [17]3 years ago
5 0

Answer:

these chromatids separate longitudinally to become individual chromosomes.

one chromosomes is composed of and DNA molecule

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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
3 years ago
A model of the cell cycle is shown here. Based on your knowledge of the cell cycle and the percentage of cells in each
denis23 [38]

Answer:A, C, D

Explanation:

6 0
2 years ago
What happens when light goes through a prism
Vladimir [108]

Answer:

The light bends

Explanation:

As a result the different colors that make up white light become separated and into 6 other colors

7 0
3 years ago
The San Andreas fault is a transform fault. The map below shows a student's approximation of where the fault line crosses throug
VladimirAG [237]

Answer: Movement along fault line

Explanation:

Here's the remainder of the question:

Which map best predicts the likely movement of land along the fault line over thousands of years?

A transform fault is simply refered to a as a fault that occurs along the plate boundary such that the motion in such case is horizontal and ends when there's a connection with another plate boundary.

Based on the question, the map that best predicts the likely movement of land along the fault line over thousands of years will be a movement along fault line.

4 0
3 years ago
Hormones such as calcitonin, parathyroid hormone, and the pituitary hormones are protein-based and water-soluble. How does a hor
sashaice [31]

Answer: Substances that are protein based cannot cross the lipid cell membrane, but can exert their effect by binding to the proteins based receptors present on the lipid bilayer.

Explanation:

Hormones such as calcitonin , Parathyroid hormone and pituatry horomones are proteins and water soluble.They cannot cross lipid bilayer but can bind to ligand binding protein receptors.

These receptors are protein macromolecules that are specific in nature for specific hormones.

After binding to the receptors, these hormone-recpetor complexes activate second messengers and regulate the downstream effects.

8 0
3 years ago
Read 2 more answers
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