If a plant is considered “drought-resistant“ does it require more or less water to perform photosynthesis?

Chemical reactions that release energy Question 6 options: will always explode. need catalysts to occur. often occur spontaneous

Firdavs [7]

Will occur spontaneously without the need of an activator because they have a great internal energy

4 0

4 years ago

Name the following : They have wings and can fly.

Lorico [155]

Answer: birds

Explanation: because birds have wings and they can fly

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3 years ago

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How is HIV contracted, and what are the treatment options?

Katena32 [7]

I believe the correct answer is: HIV is spread during unprotected sex or through contact with infected blood; it cannot be cured, but early treatment can minimize the long-term consequences.

<h2>Explanation:</h2>

Human Immunodeficiency Virus is a type of virus which causes an impairment of the immune system of the person making them susceptible to diseases such as tuberculosis, influenza and any other disease that can exploit this opportunity. It is spread by a person coming into direct contact with infected bodily fluids such as saliva during deep kissing, semen during intercourse, blood after an accident or even fluids when sharing needles and syringes for drug addicts. There is no cure but the current form of treatment slows down the virus to prevent some consequences.

<h2>Further Explanation:</h2>

The virus is enters the body through open wounds or surfaces such as the vagina or mouth where the skin is very thin and can tear. After penetrating the skin, it attaches to specific immune cells called CD8+ T-cells on points called receptors. It then enters the cell and replicates itself in the nucleus of the cell and as it goes out, it kills these immune cells making the person to have a weak immune system. The current drugs used called AntiRetroVirals (ARVs) such as the drug Zidovudin stops the virus from replicating thus reducing the total amount of virus in the body called the Viral Load. Some drugs target enzymes called proteases and reverse transcriptase that help the virus to replicate. This viral load is what is counted to estimate the total volume of HIV someone has in their body. Infected persons should use protection while having sex and also avoid sharing sharp objects to prevent transmission. They also need to take their medication to make them much more healthier in addition to taking proper balanced diets.

Level: High School

Subject: Biology

Topic: The Immune System

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3 years ago

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Which part of the cell theory do these results most support:

Vlad1618 [11]

<h2>Hey There!</h2><h2>_____________________________________</h2><h2>Answer:</h2><h2>_____________________________________</h2>

$\huge\textbf{Cell Theory}$

the Cell Theory was give by German scientists, Schleiden and T.Shwan in 1839. It stated that,

All organism are composed of one or more cells

The cell is the structural and functional unit of life
It is a de novo structure, that means it COULD arise from non living thing which was incorrect.

It was corrected by the German pathologist Rudolf Virchow in 1855. He made a convincing case, corrected and added the third point of the cell theory. It is,

Cells can arise only by a division of pre-existing cell. It is <u>NOT</u> a de novo structure.

Cell theory brought a great evolution in the field of biology which established the function of organism is the result of activities and interaction of the cell units.

$\huge\textbf{Question:}$

<u>Flask 1</u>: It is observed that there are no micro-organism, this is because the meat is sealed and no micro-organism could enter through it.
<u>Flask 2</u>: It is observed that there are micro-organism present because meat is not sealed but open.
<u>Flask 3</u>: As the S tube is used, the micro-organism are not able to reach the meat because of the curvy path

These observations support the point that<u> cells could arise only by a division of pre-existing alive cells</u> because in Flask 1 when there were no micro-organism present so there was no organisms found so no micro-organism arised, In flask 3 the S tube was used so no micro-organism could reach the meat thus there were no organism there which could divide to reproduce. The flask 2 was open, so the micro organisms reached the meat so they divided which means Cells can only arise by a division of pre-existing cells.

<h2><u>_____________________________________</u></h2><h2>Best Regards,</h2><h2>'Borz'</h2>

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3 years ago

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Drag the words to complete the sentences.

lina2011 [118]

The Replication process in eukaryotic and prokaryotic cells is quite similar. Almost the same enzymes are involved. 1)eukaryotic, 2)multiple, 3)circular.

<h3>What is the prokaryotic DNA replication process?</h3>

In prokaryotic cells, DNA Replication consists of the unwinding and opening of the double-stranded DNA molecule, a process that starts at the replication origin.

The process is completed in three stages,

⇒ Initiation, in which helicase and topoisomerase are the first enzymes involved.

Helicase works in the replication origin.

It separates the DNA into two strands allowing the replication fork to advance by unwinding the DNA.

It breaks hydrogen bonds between nitrogenated bases pairs.

Topoisomerase impedes the DNA double helix near the replication forks to get too coiled when the DNA is opening.

⇒ Elongation, in which DNA polymerase I and III, primase, and ligase act,

Polymerase I and III are responsible for DNA elongation.

They are in charge of adding nucleotides to the growing chain, from 3' to 5' extremes.

It includes only nucleotides that complement the original strand.

They need to recognize a primer to begin.

The new chain grows in 5’-3’ direction

Primase is in charge of synthesizing primers.

DNA polymerase I eliminate ARN primers and substitute them with DNA.

DNA ligase seals the gaps that remain after replacing the primers.

⇒ Mistakes correction

Endonuclease cuts the wrong segment

Polymerase I and III are in charge of correcting errors and filling empty spaces.

Ligase seals the corrected extremes.

The prokaryotic replication result is two DNA molecules, each of them carrying an old strand and a new strand.

<h3>What is the eukaryotic DNA replication process?</h3>

Eukaryotic DNA replication is the process through which DNI molecule duplicates. This event takes place during the S stage of the interphase. So when the cell divides during mitosis or meiosis, each cell will get a complete set of chromosomes.

DNI replication is semi-conservative because each new molecule carries an original DNI strand and a new one. The fact that the new molecule is composed of an original strand makes it semi-conservative. The old existing strands are used to synthesize the new complementary strand.

The main difference concerning the prokaryotic replication process is that in eukaryotic cells there are

5 different polymerase enzymes
several replication origins per chromosome
involves histones

The origin of the replication requires

The helicase enzyme breaks hydrogen bonds and separates the two original strands.

The topoisomerase enzyme is necessary to release tension.

Other proteins are also needed to join the strains and keep them separated.

Once the molecule is opened, there is a region named replication forks.

DNA polymerase makes the new nucleotides enter the fork and pairs them with the corresponding nucleotide of the original strand. Adenine pairs thymine, and cytosine pairs guanine.

DNA strands are antiparallel, and replication occurs only in 5'-3'direction. So one of the strands will replicate continuously, while the other strain will be formed by short fragments known as Okazaki fragments.

Primers are needed to make the DNA polymerase work. Primers are small units of RNA and are placed at the beginning of each new fragment. These are later eliminated by Polymerase.

Ligase seals the gaps.

<u>Complete sentenses</u>

Before a cell divides, its DNA must be replicated without errors so that the genetic codes for proteins are expressed properly. In<u> </u><u>eukaryotic</u><u> </u>cells, which have linear chromosomes, replication occurs in<u> </u><u> multiple </u>locations and ends when all the chromosomes are copied. In prokaryotic cells, which have<u> </u><u>circular </u>DNA, replication starts in only a single location and proceeds until the entire chromosome is copied.

You can learn more about replication process in prokaryotic and eukaryotic cells at

brainly.com/question/21675925

brainly.com/question/12250616

brainly.com/question/13762319

brainly.com/question/13064177

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2 years ago

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