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azamat
3 years ago
6

What are some of the conditions that the cell must regulate in order to maintain homeostasis? Do

Biology
1 answer:
Drupady [299]3 years ago
7 0

Answer:

to maintain homeostasis these things must be controlled:

  • pH levels in the body (I.e. the stomach)
  • wanted levels
  • sugar levels
  • level of Co2 in our bodies
  • blood glucose levels
  • body temperature

we maintain homeostasis to ensure that our enzymes, which speed up or make chemical reactions are working well and work within he required conditions.

external things we can do to maintain homeostasis:

  • wearing the appropriate clothing in summer and winter
  • consuming the correct temperature beverages (i.e. cold drinks in summer)
  • consumitn the correct temperature and nutrient required foods (I.e. nutritious pumpkin soup in winter)

we also shiver when we are cold - the friction between our muscles produces heat.

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Which of the following best explains how the expression of a eukaryotic gene encoding a protein wil differ if the gene is expres
Ivan

Answer: c. The protein will be made but will not function, because prokaryotes cannot remove introns.

Explanation:

Eukaryotic cells are cells that have membrane-surrounded organelles, such as a nucleus which is an organelle that stores the DNA, the genetic material. On the other hand, prokaryotic cells do not have a nucleus, and the genetic material is a single molecule, usually circular and closed and double-stranded, which is located in a sector of the cell known as the nucleoid (meaning "similar to the nucleus"), which does not imply the presence of a nuclear membrane.

<u>A gene is a unit of information at a DNA locus that codes for a protein. To synthesize that protein, DNA must be transcribed into messenger RNA (mRNA), and that mRNA is read by ribosomes in a process called translation or protein synthesis</u>. The difference between protein synthesis in prokaryotic and eukaryotic cells is that in prokaryotes, transcription and translation take place directly in the cytoplasm since there is no nucleus. In eukaryotes, transcription takes place inside the nucleus, to generate mRNA. This mRNA molecule is then directed to the cytoplasm where translation happens.

a. In prokaryotic cells, ribosomes are produced in the cytoplasm, whereas in eukaryotic cells they are generated in the nucleolus within the cell nucleus. So they both have ribosomes and they are used to make proteins, then this option is true.

b. RNA polymerase initiates transcription of all different types of RNA (mRNa, ribosomal RNA and transfer RNA). However, there are three RNA polymerase variations, each one translate a different type of gene. But, prokaryotic RNA polymerase can translate eukaryotic genes. Then this option is not true.

c. Prokaryotic cells don't  have introns because those cells do not perform a post-transcriptional RNA modifications, only done by eukaryotic cells. One of the modifications is the excision of introns in RNA. An intron is a region of DNA that is part of the primary RNA transcript, but unlike exons, they are removed from the mature transcript prior to translation. <u>So, this remotion does not happen in prokaryotes because they just don't have introns</u>. Also, in prokaryotic cells. the translation and transcription machinery is coupled. So, the transcription and translation occurs simultaneously, there will be no remotion of introns then the protein will be synthesized differently, since the reading frame is changed. Remember that each codon (set of three nucleotides) codes for an amino acid. So if the gene sequence is different because certain sections of the gene have not been removed, the protein will be different, and probably it will not function. This option explains how the expression of an eukaryotic gene encoding a protein will differ if the gene is expressed in prokaryotic cells.

d. The genetic code is the set of rules that defines how a sequence of nucleotides in RNA is translated into a sequence of amino acids in a protein. This code is common to all living organisms, although there are small variations, and it has a unique origin and is universal.  So, the code defines the relationship between each sequence of three nucleotides, called a codon, and each amino acid.  The sequence of genetic material is composed of four distinct nitrogenous bases, which are represented by letters in the genetic code:

  • Adenine (A)
  • Thymine (T)
  • Guanine (G)
  • Cytosine (C)
  • Uracil (U), only in RNA (instead of T)

So, the genetic code is the same for eukaryotes and prokaryotes. So this option is not true.

7 0
2 years ago
Explain three ways that humans threaten biodiversity
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1. humans cause deforestation, which destroys animals' habitat
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2 years ago
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What branch focuses on the living and non-living parts of the<br> environment?
GREYUIT [131]

Answer:

maybe abiotic and biotic..?

I'm not 100% sure what you're looking for, sorry!

Explanation:

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2 years ago
Which factor is most likely to cause the number of rabbits living in an area to increase?
oksian1 [2.3K]
I think some factors that influence rabbit reproduction is enough food, healthy rabbits, lots and lots of space for them to populate, and very little predators. This should help I'm not exactly sure what you are looking for though sorry. :^)
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3 years ago
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Which of the following statements accurately describes melanin’s function
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Melanin is a pigment that is produced by cells known as melanocytes in the skin of most animals, including humans. ...
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