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3 years ago

1) How is DNA condensed to form a chromosome?

Biology

1 answer:

frosja888 [35]3 years ago

7 0

Answer:

Hello! Here are the answers:

Chromosomes are a highly condensed form of a combination of DNA and protein called chromatin. DNA strands (negatively charged) are tightly wound around these proteins called histones (positively charged) to form chromosomes.
Mechanism genes code for for proteins that govern life processes. These genes or portions of DNA are called exons. DNA segments between these exons are called introns that strictly code for regulatory proteins and also contain genetic regulatory elements (DNA sequences that control gene expression).
Gene expression is the process of translation of DNA sequences into proteins. The genetic code is the nucleotide sequence in the DNA itself that codes for different amino acids that combine together to form a functional protein.

Explanation:

* 2. The intronic regions are misleadingly referred to as "junk DNA" but introns code for crucial regulatory elements that control gene expression.

* 3. The genetic code determines the sequence of amino acids in various proteins.

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Which is not a component of the plasma membrane?

ipn [44]

Answer:

nucleic acid is not a component of the plasma membrane

Explanation:

Nucleic acid is a type of complex organic substance that is found in living cells and essential to all known forms of life.

6 0

4 years ago

What type of cycle is the water cycle grouped as

geniusboy [140]

Answer:

hydrologic cycle

Explanation:

Water cycle. Water cycle, also called hydrologic cycle, cycle that involves the continuous circulation of water in the Earth-atmosphere system. Of the many processes involved in the water cycle, the most important are evaporation, transpiration, condensation, precipitation, and runoff.

hope this helps :)

4 0

3 years ago

Read 2 more answers

Predict the most likely outcome of culturing transformed E. coli in the presence of tetracycline.Justify your prediction.

My name is Ann [436]

Answer:

E.coli is a bacterium which is preffered for transformation due to its rapid growth and high efficiency of introduction of DNA molecules into cells.

Tetracycline is an antibiotic used to treat several infections such as cholera, plague, brucellosis, and malaria etcetra.

Plasmid is a small, extrachromosomal DNA molecule present in cell which is seprated from chromosomal DNA and have ability to replicate independently.

When a plasmid resistant to tetracycline and kanamycine is inserted into E.coli, the process is called transformation. E.coli might not be able to survive due to absence of plasmid but the transformed strains having antibiotic tetracycline and kanamycine will probably be able to survive it.

Hence, the culture of bacteria carrying plasmid will be able to survive only.

4 0

3 years ago

Radiolarians have a cell wall made of

murzikaleks [220]

Radiolarians have a cell wall made of .....
According to 
https://microbewiki.kenyon.edu/index.php/Radiolaria 
"
Radiolaria are unicellular organisms. They have mineral skeletons (tests) that are composed of silica. The tests are formed through the absorption of silicon compounds. This skeleton is covered with cytoplasm, which is withdrawn if the organism is disturbed."
There cell wall is made of according to another website
...
 "Radiolaria....have cell walls made up of thick cellulose walls"
Hope this helps:)
@SamSamySamantha

4 0

3 years ago

Would spinach leaves have a greater rate of photosynthesis in the bicarbonate solution you created or in atmospheric air? suppor

Ymorist [56]

Explanation:

The spinach leaves would have a higher photosynthetic rate due to the additional carbon dioxide provided from the sodium bicarbonate solution. Sodium bicarbonate NaCO3, breaks down to release dissolved carbon dioxide gas. This is taken up by the leaf for photosynthesis which begins in the stroma. Here,chlorophyll, a specialized compound which facilitates the conversion of light energy to energy stored in carbohydrates in the process photosynthesis.

Photosynthesis is a chemical pathway that’s integral to producing energy in plants and other primary producers. Energy in the form of molecules of glucose is produced from light, water and carbon dioxide while oxygen is released. This occurs in several complex steps, photosynthesis is a rate-limited reaction, depends on several factors including carbon dioxide concentration, ambient temperature and light intensity; the energy is retrieved from photons, I.e. particles of light, and water is used as a reducing agent.

Water supplies the chlorophyll in plant cell with replacement electrons for the ones removed from photosystem II. Additionally, water (H2O) split by light during photolysis into H+ and OH- acts as a source of oxygen along with functioning as a reducing agent; it reduces the molecule NADP to NADPH by providing H+ ions. NADP and NADPH are integral to the Calvin cycle where monosaccharides or sugars like glucose are produced after the modification of several molecules.

6CO2 + 6H2O + light energy → C6H12O6 + 6O2

No, the light-independent pathway cannot occur when the discs are placed in the dark environment-this is because during the light dependent process then the products of light dependent reactions ATP and NADPH, along with several enzymes are used in the Calvin cycle which produces energy storage molecules like sugars/ carbohydrates and other organic molecules. Respiration, occurs at the same time,producing CO2 as a byproduct. However, this doesn't affect photosynthesis; plants are living organisms that need more energy for metabolic processes like the Calvin Cycle .
Photosynthesis occurs faster in the cops containing bicarbonate solution. This is due to the increased amount of carbon for use by the leaves in photosynthesis; the rates of reaction are higher in light environments because photosynthesis is a light-dependent process; the energy used and the light-dependent reactions produces ATP and NADPH which are then used to begin the Calvin cycle.
This supports the hypothesis, that the syringe containing sodium bicarbonate at higher light intensities would produce more floating disks due to higher rates of photosynthesis, which releases water and Oxygen gas as end products, causing the disks to float to the top. Conclusion:Thus at higher intensities of light, and in the pesence of sodium bicarbonate i.e. light environments the rate of photosynthesis is also higher and will occur faster; the Oxygen produced makes more leaf disks float.