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3 years ago

if simple sugars are present, the solution will turn which color when combined with the food sample and heated?

1 answer:

3 0

The answer is green, yellow or brick-red. If simple sugars are present, the blue solution will turn green, yellow or brick-red when combined with the food sample and heated. Benedict's solution is used to test for simple sugars, such as glucose. It is a clear blue solution of sodium and copper salts. When heated with the food sample, the blue solution changes color to green, yellow, and brick-red, depending on the amount of sugar.

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A mutation occurred in the following DNA sequence AGCCTAGCC and the mutated form is now AGCCTTAGCC. Which of the following corre

Ilia_Sergeevich [38]

Answer:

Explanation:

1.A deletion mutation occurs when a wrinkle forms on the DNA template strand and subsequently causes a nucleotide to be omitted from the replicated strand.

2.This type of variant results in a shortened protein that may function improperly, be nonfunctional, or get broken down. An insertion changes the DNA sequence by adding one or more nucleotides to the gene.

3. A substitution mutation can cause the following: Change in the coding of amino acids codon to a particular stop codon resulting in an incomplete protein, which is usually non-functional. Can cause Silent mutations where a codon change can encode the same amino acid resulting in no changes in the protein synthesized.

4. when a premature nonsense or stop codon is introduced in the DNA sequence. When the mutated sequence is translated into a protein, the resulting protein is incomplete and shorter than normal. Consequently, most nonsense mutations result in nonfunctional proteins.

3 0

3 years ago

Sexual reproduction is important for the survival of the species. It is important for ALL BUT ONE of these reasons. That is

Ne4ueva [31]

Answer:

C) it is necessary for the survival of the individual.

Explanation:

Sexual reproduction is rarely, if ever, necessary for the individual. This is not a reason for its importance. However, while not important for the individual, sexual reproduction is important for the species. It allows genetic variability among offspring, as well as mutations. This ensures that not all members of a species are the same, and in this way, they have a better chance of surviving. Moreover, it allows for offspring to be produced at a faster rate.

5 0

3 years ago

Assume that the red blood cell counts of women are normally distributed with a mean of 4.577 million cells per microliter and a

postnew [5]

Answer: C. 82.26%

Explanation:

Given : The red blood cell counts of women are normally distributed with

$\mu=4.577\text{ million cells per microliter}$

$\sigma=0.382\text{ million cells per microliter}$

Let X be the random variable that represents the red blood cell counts of randomly selected woman.

Z-score : $z=\dfrac{X-\mu}{\sigma}$

For X=4.2

$z=\dfrac{4.2-4.577}{0.382}\approx-0.99$

For X=5.4

$z=\dfrac{5.4-4.577}{0.382}\approx2.1544$

Now, the probability that the women have red blood cell counts in the normal range from 4.2 to 5.4 million cells per microliter will be :-

$P(4.2$

Hence, 82.26% of women have red blood cell counts in the normal range from 4.2 to 5.4 million cells per microliter.

4 0

3 years ago

The hypothalamus is known to control the activity of the thyroid, which has traditionally been called the master endocrine gland

Dominik [7]

Answer: The statement is true

Explanation:

The hypothalamus is part of the Fore-brain responsible for the secretion of hormones from the pituitary gland.

This pituitary gland situated in the hypothalamus is traditionally called the MASTER ENDOCRINE GLAND, as it influence the activities of all other glands such as thyroid gland.

Thus, the hypothalamus bearing the pituitary gland is said to be in CONTROL of the activity of the thyroid, and ALSO the master endocrine gland.

3 0

3 years ago

What happens to a ecosystems food chain if the concentration pollutants move up.

Furkat [3]

Producers: Plants are producers because they make usable energy from light. They turn sunlight, carbon dioxide and water into sugar energy. Producers are the foundation of the food web, because they provide the base energy needed by all wildlife.Primary Consumers: Herbivores are primary consumers, because they receive their energy directly from plants. Secondary Consumers: Carnivores are secondary consumers, because they receive their energy by eating primary consumers. Secondary consumers are predators. An omnivore acts as both a primary and secondary consumer, because omnivores eat both animals and plants. Decomposer: Decomposers get energy by breaking down dead plants and animals. They are extremely important, because decomposers convert dead matter into energy and release nutrients that can be added back to soils and ecosystems.

What is a Food Web?
A food web is a diagram displaying how all the producers, decomposers and primary and secondary consumers interact in an ecosystem. It shows how energy is transferred between species.

A food web can be very simple - with one producer, consumer and decomposer- or a food web can be extremely complicated. A food web of an entire woodland ecosystem becomes complex when you include every species from plants to insects and mammals.

There Is More to a Food Web than Energy

When animals eat their prey, they consume more than just energy. They also absorb all the chemicals and nutrients inside the prey. For example, when you eat a banana you get energy from the banana, as well as the added benefits of potassium and vitamin A.

Sometimes animals ingest pollutants that can become stored in their fat and tissues. Human-caused pollution has added heavy metals, oil, and industrial and pharmaceutical chemicals to the environment. Plants, fish and other species absorb these toxins, and as they are eaten by predators, the toxins are then absorbed into the predators’ tissues. As the chain of predator and prey continues up the food web the toxins become more concentrated and move higher and higher up the food web. The pollutants can have a disastrous effect on the food web and potentially kill species.

What happens when a Chemical is Added to the Food Web?
To explain the true impacts of chemicals on the food web, we’re going to use the real world example of mercury poisoning.

Coal-fired power plants burn coal and release mercury into the atmosphere as a byproduct. Over time, mercury falls to Earth through rain, snow and natural settling. Rain carries the mercury to streams and rivers and it eventually settles in lakes and ponds.

After mercury enters lakes and ponds, bacteria transform mercury into a more easily absorbed toxic substance called methylmercury. Aquatic plants, bacteria and plankton absorb methylmercury from the surrounding water.

It’s at this point that mercury becomes added to the food web. Eventually, the contaminated plants, bacteria and plankton will be eaten by predators, such as fish. The methylmercury toxins will move into the tissues of the fish and poison a new level of the food web.

Magnifying Up the Food Web
Individual plants, plankton and bacteria only have a small amount of methylmercury. The problem begins at the next level of the food web. Fish don’t eat just one plankton or plant – they can eat hundreds or thousands of them! All the mercury in each of the plankton or plants has now been eaten by a fish and absorbed into the fat and tissues. After eating 100 plankton, the methylmercury in the fish is now 100 times what it was in the plankton!

It doesn’t stop there. The higher and higher up the food chain you go, the more food is necessary to maintain energy and activity.

If a small fish eats 50 mercury contaminated plants.And a large fish eats 100 small fishAnd an eagle eats 100 large fish.

50X100X100 = 500,000 The concentration of mercury in the eagle is 500,000 times larger than it was in the plankton!!

The process that causes the concentration of a substance to increase as it moves up the food web is called bioaccumulation. Methylmercury is a famous example of bioaccumulation, because mercury poisoning causes neurological disorders, reduced reproduction and even death in raptors and mammals. People are susceptible to mercury poisoning by eating too much contaminated fish.

Study the diagram to see how mercury bioaccumulates up this common food web.

5 0

3 years ago