10) What are the two most common forms of sand? How are each type formed?

Select all that apply.

natka813 [3]

<span>DNA uses deoxyribose and RNA uses ribose; DNA has thymine and RNA has uracil.</span>

8 0

3 years ago

Volume and pressure inside the left ventricle at the end of diastole is referred to as:

olga_2 [115]

The volume and pressure inside the left ventricle at the end of diastole is referred to as end-diastolic volume and end-diastolic pressure respectively.

<h3>What is a diastole?</h3>

A diastole is the part of the heartbeat cycle when the heart muscle relaxes and allows the heart chambers to fill with blood.

The volume inside the left ventricle at the end of diastole is referred to as end-diastolic volume.

The pressure inside the left ventricle at the end of diastole is referred to as end-diastolic pressure.

Learn more about diastole at: brainly.com/question/902007

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8 0

3 years ago

What affect does binding a gas to a hemoglobin have on homeostasis

frutty [35]

Explanation:

Haemoglobin acts as a protein buffer.

Haemoglobin- oxygen binding in the blood is part of acid-base homeostasis. The cells within the brain or CNS ensure that more oxygen is taken into the lungs at a faster rate while carbon dioxide is removed; this aids in gaseous exchange and maintaining the pH of the blood- oxygen concentrations are kept high within the blood stream as blood circulates through the body.

Blood pH levels are typically within 7.35 --7.45. it is regulated by coordinated activity controlled by the brain, and carried out by the kidneys and lungs; along with red blood cells. When the body needs more oxygen, CO2 (as waste from cellular respiration), in the blood is converted to biarbonate increasing acidity; at the same time, H released in the reaction, and buffered by haemoglobin.

-The haemoglobin undergoes reduction by oxygen, and the pH level is maintained.

Further Explanation:

A typical oxygen disassociation curve shows haemoglobin’s percentage saturation at different oxygen concentrations (partial pressures). This shows the equilibrium between oxyhaemoglobin (haemoglobin in its oxygen bound state and haemoglobin (free of oxygen molecules). The saturation generally increases with increased partial pressures of oxygen.

Haemoglobin is an oxygen binding protein comprising four iron-based peptide subunits: two α subunits and two β subunits. Each molecule of haemoglobin has the ability to bind up to four oxygen molecules at a time; this occurs via cooperative binding- meaning that with increased haemoglobin- oxygen binding at the protein haemoglobin’s subunits,(where oxygen is a ligand) there is an increase in its affinity for oxygen.

This is because there is a conformational change in the hemoglobin molecule due to the altered orientation of the protein’s secondary structures, making it easier for a second molecule of oxygen to successively followed by more O2-Haem binding until the molecule is saturated- at this point the curve plateaus- it reached its carrying limit.

Hormones bind to chemical receptors in order to cause specific changes in target cells, these lead to changes in the body's internal environment called homeostasis. It includes the thyroid, parathyroid, pituitary, pineal and adrenal glands along with other regions.

Learn more about hemoglobin at brainly.com/question/5866353

Learn more about the circulatory system at brainly.com/question/10083364

Learn more about homeostasis at brainly.com/question/1601808

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5 0

3 years ago

11. Name and explain all of the stages of the water cycle.

crimeas [40]

Explanation:

Evaporation - the water from the oceans began to evaporate due to the heat of the sun and forms water vapour

Condensation - the vapour then rises and forms clouds and forms a liqiud

Presipitation - after the cloud is filled with water, it falls down as rain

3 0

3 years ago

Identify the model that best represents the plasma membrane of a hypothetical cell that exists in a nonaqueous environment and w

Klio2033 [76]

Answer:

The models are missing in the question. The models along with the question is provided in the attachment below.

The answer is : Model A represents the Plasma membrane.

Explanation:

According to the question, model A represents the plasma membrane. The reasons are :

(a). In the model A, the bilayers consists of two leaflets of the amphipathic lipid molecules. Here the polar head groups is in contact with the intra cellular or the extra cellular non aqueous phase, where the non polar tails are facing each other constituting the hydrophobic interior of the membrane.

(b). Lipid are not rigid as well as static structure. In the lipid bilayer, the lipid molecule are able to rotate around their axis freely and diffuse laterally with each leaflet.

(c). The plasma membrane acts as the selective plasma membrane.

8 0

3 years ago