1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Leona [35]
2 years ago
13

Euglenoid chloroplasts are surrounded by how many membranes

Biology
2 answers:
mixer [17]2 years ago
7 0
<span>I think the answer is Three membranes. </span>
Vesnalui [34]2 years ago
5 0

yes, the correct answer is three.

You might be interested in
Are RNAs processed before translation is able to occur in Prokaryotes? Do only mRNAs undergo processing and maturation in Eukary
raketka [301]

Answer: RNAs are not processed before translation in prokaryotes, this process only takes place in eukaryotes.

Explanation:

Messenger RNA or mRNA is a single-straded ribonucleic acid that transfers the genetic information from the DNA (deoxyribonucleic acid) molecule of the cell nucleus to a ribosome (which are the machinery responsible for protein synthesis) in the cytoplasm. mRNA determines the order in which the amino acids of a protein will be joined and acts as a template or pattern for the synthesis of that protein. To accomplish this, the DNA molecule must be transcribed into an RNA molecule, which is used for protein synthesis.

The messenger RNA obtained after transcription is known as primary transcribed RNA or precursor RNA or pre-mRNA, which in most cases is not released from the transcription complex in a fully active form, but in eukaryotes it must undergo modifications before it can perform its function (RNA processing or maturation). These modifications include:

  • Elimination of fragments (splicing): In most cases, the <u>mRNA undergoes the removal of internal, non-coding sequences called introns, and the connection of exons. This does not occur in prokaryotic cells</u>, as they do not have introns in their DNA.
  • Protection by CAP: <u>Addition to the 5' end of the structure called "cap" or "capping"</u>, which is a modified guanine nucleotide, 7-methylguanosine triphosphate, via a 5'-5' triphosphate linkage, instead of the usual 3',5'-phosphodiester linkage. This cap is necessary for the normal RNA translation process and to maintain its stability.
  • Polyadenylation signal: <u>Addition to the 3' end of a poly-A tail, a long polyadenylate sequence, whose bases are all adenine</u>. Its addition is mediated by a sequence or polyadenylation signal (AAAAAA), located 11-30 nucleotides upstream of the original 3' end. This tail protects the mRNA from degradation, and increases its half-life in the cytosol, so that more protein can be synthesized.

The mature mRNA (in eukaryotes) is transferred to the cytosol of the cell through pores in the nuclear envelope. Once in the cytoplasm, ribosomes are coupled to the mRNA. However, in prokaryotes, ribosome binding occurs while the mRNA strand is being synthesized. After a certain amount of time, the mRNA is degraded into its component nucleotides by ribonucleases. So, the transcription and translation processes are carried out in a similar way as in eukaryotic cells but they occur simultaneously. But, the fundamental difference is that, in prokaryotes, the messenger RNA does not undergo a maturation process and, therefore, no cap or tail is added and no introns are removed. Moreover, it does not have to leave the nucleus as in eukaryotes, because in prokaryotic cells there is no defined nucleus.

So, RNAs are not processed before translation in prokaryotes, this process only takes place in eukaryotes.

6 0
2 years ago
Anyone please help me with this
kati45 [8]
I believe it’s d. 5-Carbon sugar.

3 0
2 years ago
What are the terms describes the dna–protein complexes that look like beads on a string?
marishachu [46]

Answer: The question is incomplete,below is the complete question.

What are the terms describes the dna–protein complexes that look like beads on a string?

A) Chromatin

B) 30-nanometer fibre

C) Histones

D) Nucleosome

The correct answer is option D

Explanation: A Nucleosome is the basic fundamental unit of a DNA, and the fundamental sub-unit of a Chromatin.

The Nucleosome is the basic packing unit of DNA,it is built from histone proteins. A nucleosome is made up of 8 histones proteins resembling a thread wrapped round a spool.

The smallest bundle of DNA is known as a Nucleosome,a Nucleosome is produced through interaction between DNA and histone proteins.

5 0
3 years ago
An organism is prokaryotic, unicellular, and autotrophic, and it also causes disease. Which kingdom does it belong in?
dolphi86 [110]

Answer:

Eubacteria Kingdom

Explanation:

pls brainlyest

4 0
2 years ago
Read 2 more answers
Which of the following carries the hereditary information for cells?
Nady [450]

Are you asking for DNA or chromosomes or something? You asked for which of the following but then dont give the following

6 0
2 years ago
Other questions:
  • A woman at 22 weeks' gestation has right upper quadrant pain radiating to her back. she rates the pain as 9 on a scale of 1 to 1
    13·1 answer
  • Use the information in the following paragraph to answer the question(s) below.
    15·1 answer
  • How does proximity to oceans affect Temperatures and rainfall amounts?
    8·2 answers
  • Which of the following groups is a population?
    12·1 answer
  • Which type of traits vary quantitatively due to the interaction of multiple genes? polygenic codominant incomplete dominant domi
    15·2 answers
  • How did planetesimals form?
    9·1 answer
  • PLEASE HELP I WILL MARK BRAINLIEST <br><br> I need help with 18 through 27 please
    7·1 answer
  • Answer these 4 task cards Plz
    8·1 answer
  • What is an amino acid?​
    11·2 answers
  • What factors contributed to the success of the virus in 2012
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!