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3 years ago

Which of the following correctly describes the result of genetic mutations when they occur in a body cell?

1 answer:

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<span>Some mutations don't have any noticeable effect on the phenotype of an organism. This can happen in many situations: perhaps the mutation occurs in a stretch of DNA with no function, or perhaps the mutation occurs in a protein-coding region, but ends up not affecting the amino acid sequence of the protein</span>

<span>For more accurate answer, you can put your options...</span>

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Is the vagus nerve the heart rate centre of the brain?

koban [17]

Answer:

The vagus nerve has two bunches of sensory nerve cell bodies, and it connects the brain stem to the body. It allows the brain to monitor and receive information about several of the body’s different functions.

Explanation:

The vagus nerve is the longest and most complex of the 12 pairs of cranial nerves that emanate from the brain. It transmits information to or from the surface of the brain to tissues and organs elsewhere in the body.

There are multiple nervous system functions provided by the vagus nerve and its related parts. The vagus nerve functions contribute to the autonomic nervous system, which consists of the parasympathetic and sympathetic parts

The vagus nerve has a number of different functions. The four key functions of the vagus nerve are:

-Sensory: From the throat, heart, lungs, and abdomen.

-Special sensory: Provides taste sensation behind the tongue.

-Motor: Provides movement functions for the muscles in the neck responsible for swallowing and speech.

-Parasympathetic: Responsible for the digestive tract, respiration, and heart rate functioning.

7 0

3 years ago

Ferns do not have true roots.<br><br> True<br> False

lawyer [7]

<span>Like the sporophytes of seed plants, those of ferns consist of stems, leaves androots. Stems: Fern stems are often referred to as "rhizomes", even though they grow underground only in some of the species.</span>

6 0

3 years ago

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A normal breath takes in about 1.0 L of air. If air has an average molar mass of 28.8 g per 1 mol and has a density of 0.97 g/mL

Ann [662]

Taking into account the definition of density and Avogadro's Number, you take 2.0286×10²⁵ molecules of air.

<h3>What is density</h3>

Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.

In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance.

Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

$density=\frac{mass}{volume}$

<h3>What is Avogadro's Number</h3>

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

<h3>Amount of molecules of air</h3>

In this case, you know that:

Density= 0.97 $\frac{g}{mL}$
Volume= 1 L= 1000 mL

Replacing in the definition of density:

$0.97 \frac{g}{mL}=\frac{mass}{1000 mL}$

Solving:

mass= 0.97 $\frac{g}{mL}$ ×1000 mL

Air has an average molar mass of 28.8 g per 1 mol. Then 970 grams are contained in 33.68 moles.

Now, considering the definition of Avogadro's number you can apply the following rule of three: If 1 mole of air contains 6.023×10²³ molecules, 33.68 moles contains how many molecules?

amount of molecules = (33.68 moles× 6.023×10²³ molecules)÷ 1 mole

<u><em>amount of molecules= 2.0286×10²⁵ molecules</em></u>

Finally, you take 2.0286×10²⁵ molecules of air.

Learn more about

density:

brainly.com/question/952755

brainly.com/question/1462554

Avogadro's Number:

brainly.com/question/11907018

brainly.com/question/1445383

brainly.com/question/1528951

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1 year ago

How do you think our understanding of organisms would be different without the contribution and development or our current class

IRISSAK [1]

Answer:

It is important to have a standardized system of classification so people can easily identify different things. It allows scientists to identify, name and group different organisms. It is important so scientists are able to easily communicate about different organisms without confusion.

It is necessary to classify organisms because: It helps in the identification of living organisms as well as in understanding the diversity of living organisms. Classification helps us to learn about different kinds of plants and animals, their features, similarities and differences

if Linnaeus had not developed the taxonomy system there would be no organized way of naming or categorizing new organisms in the scientific community and around the world. Instead, all organisms would be categorized differently in every part of the world, with different names.if Linnaeus had not developed the taxonomy system there would be no organized way of naming or categorizing new organisms in the scientific community and around the world. Instead, all organisms would be categorized differently in every part of the world, with different names.

Explanation:

4 0

2 years ago

What is the role of stomata in transpiration

Alja [10]

Answer:

The small opening present on the epidermis which helps with exchange of gasses and transpiration is called stomata. Since most of the water (90%) is lost through stomata it regulates the level of excess water in the plant.

Explanation:

<h3>please mark me as brainliest </h3>

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1 year ago

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