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3 years ago

WILL BE MARKED AS BRAINLIEST!!!

1 answer:

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B) cortisol ensures that the brain has glucose when it’s necessary. Cortisol is a steroid hormone that helps control blood sugar levels, metabolism, and inflammation. Glucose, also known as sugar, is an energy source used in cells in the body. The brain is highly demanding of energy since it is so rich in nerve cells and neurons, so glucose is essential to the brain. Too much can harm the brain though, so it is important for the cortisol to control the sugar levels.

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What are the division of mitosis

timama [110]

Nuclear división in eukaryotic cells that occurs when a parent cell divides to produce two identical daughter cells .

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3 years ago

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Why did we need to measure the absorbance at two wavelengths during the beta-galactosidase lab?

Gnom [1K]

While the absorbance at 420 nm is related to the amount of o-nitrophenol produced, the absorbance at 600 nm is proportional to cell density, which aids in standardizing our estimations of enzyme activity.

<h3>Describe absorbance.</h3>

The amount of light absorbed by a solution is measured by its absorbance (A), often referred to as optical density (OD). The amount of light that may flow through a solution is called its transmittance.

<h3>How is the activity of beta-galactosidase determined?</h3>

The colorless ONPG substrate is changed by beta-Galactosidase into galactose and the chromophore o-nitrophenol, which results in a vivid yellow solution. The amount of substrate transformed at 420 nm can be calculated by measuring the solution's beta-galactosidase activity using a spectrophotometer or a microplate reader.

<h3>What is measured by the beta-galactosidase assay?</h3>

The -Gal Assay Kit gives users the tools they need to swiftly assess the amounts of active beta-galactosidase expressed in cells that have been transfected with plasmids encoding the lacZ gene.

learn more about absorbance here

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2 years ago

What is an example of "maintaining structure"?

gladu [14]

a cell dividing

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5 0

3 years ago

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How can a megaphone used by a cheerleader allow people on the opposite side of a field to hear her better?

aalyn [17]

<em>A megaphone used by a cheerleader can allow people on the opposite side of a field to hear her better because;</em>

D. Solid objects can change the direction of sound waves; megaphones allow users to determine the general direction of the sound.

<u>Determination of the general direction of the sound lessens its dispersion and thus, it reaches the observers at a higher intensity, hence it being louder.</u>

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3 years ago

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What proportion of DNA molecules will contain any radioactivity after two rounds of replication?

Vladimir [108]

Answer: After two rounds of replication half of DNA molecules will contain one strand with radioactive nitrogen. And the other half will contain two strands with radioactive nitrogen.

Explanation:

In semi-conservative replication, two DNA molecules are created, each consisting of one strand of the original DNA and one new complementary strand. In other words, the <u>DNA is formed from one old strand and one new strand.</u> And the existing strands serve as a complementary mould to the new ones.

Meselson-Stahl's experiment involves growing the bacterium <em>Escherichia coli </em>in a medium containing radioactive nitrogen. Watson and Crick had predicted that DNA replication was semi-conservative, <u>if so the DNA extracted from the bacteria would be somewhere in between the DNA extracted from the "normal" nitrogen medium and the radioactive nitrogen medium.</u>

DNA replication, which occurs only once in each cell generation, <u>requires many "building blocks", enzymes, and a great deal of energy in the form of ATP.</u> The nucleotides, which are the building blocks of DNA, have to be assembled and available in the nucleus along with the energy to bind them together. Each nucleotide consists of three parts: a nitrogen-containing ring structure called a nitrogen base, a five-carbon sugar, and at least one phosphate group.

Through the action of DNA polymerase during replication,<u> new nucleotides bind to the corresponding nucleotide of the original chain (A to T, C to G).</u>

Since the DNA strands are anti-parallel, and replication proceeds only in the 5' to 3' direction on both strands, one strand will form a continuous copy, while the other will form a series of short fragments known as Okazaki fragments. The chain that is synthesized continuously is known as the forward chain and the chain that is synthesized in fragments is known as the backward chain.

Then, since replication is semi-conservative, the new strand will have nucleotides with "normal" nitrogen while the new strand created from that same DNA molecule will incorporate nucleotides with radioactive nitrogen. So, after two rounds of replication half of DNA molecules will contain one strand with radioactive nitrogen. And the other half will contain two strands with radioactive nitrogen.

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3 years ago