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3 years ago

20 POINTS!!!!!!!!!

Biology

2 answers:

wlad13 [49]3 years ago

6 0

Answer:

i think the answer is

MrRa [10]3 years ago

5 0

All you have to see whether or not a duplication mutation has occurred, is simply count the number of nucleotides present in the original DNA strand and compare that number to the nucleotides present in the options. The only sequence which has substantially more nucleotides would be C. Thus we know that certain portion had been duplicated if the sequence after the mutation is in fact C.

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Which is the order of airflow during inhalation?

tigry1 [53]

Answer:

Nasal cavity, larynx, trachea, bronchi, bronchioles, alveoli.

Explanation:

The air travels through the respiratory system during inhalation in the next order:

Nasal cavity: You inhale air into your nose.
Larynx: The air travels down to this organ, a hollow, tubular structure that plays a key role in phonation, respiration, and deglutition.
Trachea: (Or windpipe) is a wide, hollow and cartilaginous tube that connects the larynx to the bronchi.
Bronchi: The trachea divides into two primary bronchi; they are the main passageway into the lungs.
Bronchioles: The bronchi develop smaller the closer they get to the lung tissue and are then consider bronchioles.
Alveoli: They are tiny air sacs located at the end of the bronchioles, which is the site of oxygen and carbon dioxide exchange in the respiratory system.

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3 years ago

Define the term peristalsis and explain why is it so important

satela [25.4K]

Answer:

Peristalsis is a series of wave-like muscle contractions that move food through the digestive tract. ... There, the food is churned into a liquid mixture called chyme that moves into the small intestine where peristalsis continues. Stretching out a piece of intestine will make it easier to see the wave-like motion

3 0

3 years ago

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Plants are divided between vascular and non-vascular.

Irina-Kira [14]

Answer:

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Explanation:

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3 years ago

Steven's preference is that most of his carbohydrate intake comes from sources low on the glycemic index scale. What types of fo

Strike441 [17]

Answer:

Low glycemic index food such as Bran cereals, Apple, Orange, Kidney beans, Black beans, Lentils, Wheat tortilla, Skim milk, Cashews,Peanuts, Carrots

Explanation:

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4 years ago

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This is the strongest intercellular connection between the functioonal units of life and it is important in cardiac muscle. ____

tia_tia [17]

Answer:

The correct answer for the question: This is the strongest intercellular connection between the functional units of life and it is important in cardiac muscle:____, would be: intercalated discs.

Explanation:

Just like skeletal muscle fibers depend on T-Tubules to be able to propagate an electrical impulse between the sarcomeres that form it, so that all respond in syncronization, myocardial fibers also require to do this; otherwise the heart would simply not function. In the case of myocardium, the muscle of the heart, synchronization is vital in order for it to be able to pump blood and meet the needs of the body. Also, like skeletal muscle, these fibers count with a structure that will permit such a thing; intercalated discs. These discs are formed by the ends of myocardiocytes and extensions of plasma membrane, just like in T-Tubules and they play a vital role not just in unifying the entire muscle fiber, but also adjoining muscle fibers. They also play a vital role in action potential propagation.

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3 years ago