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DedPeter [7]
3 years ago
7

Which statement about RNA is not true? Uracil is found in RNA as one of the two pyrimidine nitrogenous bases. RNA possesses cata

lytic activity, which earned it the name "ribozyme." RNA is thought to have dominated early life on earth, serving as both genetic information and as a catalyst. RNA is a more stable molecule than DNA. RNA typically consists of a single polynucleotide strand with distinct secondary structures.
Biology
2 answers:
Alla [95]3 years ago
6 0

Answer:

RNA is a more stable molecule than DNA

Explanation:

This is a false statement. DNA is far more stable than RNA.

This is  because of  the stability provided by the presence of double helix  strands held by  hydrogen bonds holding the purine and pyrimidine bases  is shape,which releases free energy for   thermodynamic  stability.

it is also stable because of the  interaction of the  hydrogen bonds with the surrounding  water molecules in the  cells.

The presence of Thymine instead of Uracil in DNA is additional factor to DNA stability, because Thymine has resistance to photochemical mutations compare to U in RNA. Thus  genetic code encoded in DNA molecule  is more stable against mutation  compare to RNA.

Furthermore, the phosphodiester  bonds holding the alternate backbone of phosphate and sugar further provided needed stability.

RNA is made up of single strands, made up of Uracil base  of low resistance to photochemical mutations, OH-groups in position 2 of its ribose sugar which makes it to easily hydrolysed in alkaline solution. These factors makes it less stable compare to DNA.

mash [69]3 years ago
4 0

Answer: RNA is a more stable molecule than DNA

Explanation: DNA (deoxyribonucleic acid) is much stable than RNA (ribonucleic acid) for many reasons; Frist of all its because of the double strand of the DNA versus the single-stranded RNA. This is thanks to the Hydrogen bonding between bases since those bondings release free energy that allows the molecule to be provided by more thermodynamic stability.

Also the lack of 2′ OH groups makes DNA more stable since the OH groups are very reactive by themselves. In the DNA sugar molecule there is not a spare OH group that could start reacting on its own. So this is why DNA is immune to chemical reactions, while RNA (having an extra OH group) is more chemically "promiscuous".

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What type of conduction takes place in unmyelinated axons? What type of conduction takes place in unmyelinated axons? Continuous
Volgvan

Continuous conduction takes place in unmyelinated axon.

Explanation:

Based on the presence and absence of myelin sheath, the neurons had been classified as myelinated and non-myelinated neurons respectively.

In myelinated neurons the transmission of impulse takes place only at the non myelinated region called nodes of Ranvier. Due to this, the conduction in Myelinated neuron is saltatory.

The conduction in non-myelinated neuron takes place throughout the length of axon and it is continuous.

Saltatory conduction is faster than continuous conduction.

6 0
3 years ago
A standard PCR cycle includes three steps: denaturation (95°C), annealing (55°C), and elongation (65°C).
xz_007 [3.2K]

Answer:

Denaturation process: The DNA template  

Annealing process: Primers  

Elongation process: dNTPs and Taq polymerase

Explanation:

For the denaturing process, the only ingredient that is required is the DNA template that will be separated from a double helix (or double strand) into a single strand, by increasing the temperature to 95 C, (at this temperature the hydrogen bonds that keep together the double stranded break). After the double strand is denatured, the following process is annealing. For this, the required ingredient are the primers; these primers will hybridize or anneal according to the nucleotide complementarity to the single strand of the DNA. Finally, for the Elongation process, you will require the Taq polymerase and the dNTPs. The enzyme will synthesize or “generate” a new strand of DNA based on the DNA template, using the provided dNTPs in the direction 5’ to 3’.

I hope this clarify you inquiry.  

6 0
2 years ago
Discuss how microbial world is divided providing at least two unique features of each of the living group
Maksim231197 [3]

Microorganisms can be divided into two groups:


1. Archea


• Archea are prokaryotic unicellular organisms without cell nucleus or other membrane bound-organelles.  


• Their membrane is built from ether lipids, which differs them from bacteria’s cell membrane.


•  


2. Bacteria


• Bacteria are also unicellular prokaryotic organisms.  


• Bacterial cell membranes are made from phosphoglycerides with ester bonds. Bacterial genome is in a form of circular chromosome.  


• They reproduce by binary fission or by budding.


Besides, prokaryotes (Archea and Bacteria) a large number of eukaryotes are also microorganisms. Unicellular eukaryotes contain organelles such as the cell nucleus, the Golgi apparatus and mitochondria. Usually, they reproduce asexually by mitosis. An example of eukaryotic microorganism is Protist.



4 0
3 years ago
The annual world seafood catch grew from approximately 19 million tons in 1950 to approximately 90 million tons in 1997. As a co
GalinKa [24]

Answer:

It's an alarming situation about the decline of commercial fish population and we must need to develop the policy solution to this dangerous fisheries problem.

We can develop more fish by fish hatcheries to increase the population of fish and release large number of fish into the ocean.

We should give the awareness to the general public related to decrease the recreational fishing impact.

Commercial fishing must be ban until we reaches the sustainable level of fish.

There must be place international limits to every country related to limited number of fish they can take.

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3 years ago
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Mila [183]

Answer:

Mm

Explanation:

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