BIOLOGY COLLEGE

Passive expiration is preceded by the:a. recoil of the lungs
b. contraction of the internal intercostals muscles.
c. contraction of the diaphragm.
d. increase in atmospheric pressure.
e. increase in CO2 in the blood

Answers

Answer 1
Answer:

Answer:

The correct answer is option a. "recoil of the lungs".

Explanation:

Normal respiration is passive, which means that no energy is needed to release the air from the lungs. Passive respiration is preceded by the recoil of the lungs that happens without any effort because of the elasticity of the lungs tissue. After inspiration, the diaphragm and intercostal muscles relax and the thoracic cavity and lungs decrease in volume. This causes that the interpulmonary pressure rises above atmospheric pressure, creating an air pressure gradient that put the air out of the lungs without the need of energy.

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A genetic engineer needs to use gene therapy to help a person with cystic fibrosis. Arrange the following steps in the order the engineer would use them.a. Use only the steps you need. Inject the modified CFRT gene into a fertilized egg and implant into a woman who will be the surrogate mother.b. Combine the cloned CFRT gene with a disarmed respiratory virus.c. Clone the CFRT gene from someone with cystic fibrosis.d. Clone the CFRT gene from someone without cystic fibrosis.e.Modify the CFRT gene by putting on a different promoterf. Test the patient’s blood cell DNA with PCR to see if they have the CFRT transgene.g. Have the patient use an inhaler that contains the modified respiratory virus.
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PLEASE HELP ITS MY LAST QUESTION AND ITS DUE TOMORROW PLEASE HELP !!!!State two ways in which the body is insulated against loss of heat

Where does meiosis take place in bryophytes

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Which of these describes inference to the best explanation? it draws a conclusion based on what would best explain one's observations it is a deductive inference form it only applies to scientific observations it generally leads us away from scientific explanations?

Answers

It draws a conclusion based on what would best explain one's observations.

Inference is the process where logical consequences evolve from premises that are assumed to be true. Knowledge backed with observations and reasoning as evidence is used to make conclusions. It is also referred to as an educated guess and is not necessarily factual.

Sodium is an example of an alkali metal. The alkali metals are found in the leftmost column of the periodic table, known as Group 1. Use the interactive periodic table to explore the properties of the following alkali metals: lithium (Li), sodium (Na), potassium (K), rubidium (Rb), and cesium (Cs). The animations demonstrate a chemical property common to alkali metals: they react with water. How does the reactivity vary among this group of elements? Why might patterns like this be useful to scientists?

Answers

The reactivity of alkali metals increases down the group. Periodic trends help scientists to predict the reactivity of newly discovered elements.

In group 1, reactivity of elements increases down the group because as you go down the group more shells are added thereby making it easier to remove the outermost electron.

This explains the increase in chemical reactivity from Lithium to cesium.

These periodic trends are very important in predicting the chemical reactivity of newly discovered elements that are added to a group.

Learn more: brainly.com/question/18153051

Answer:

The reactivity greatens the farther you go down on the periodic table. Lithium will have the weakest reaction, and cesium will have the greatest reaction. Patterns like this are useful to scientists because it shows which elements are the most reactive and which aren't. The farther down and to the left you go within the periodic table, the more reactive the elements become. The farther up and to the right you go, the less reactive they become.

Explanation:

Definition of human rights
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Answers

Answer: a right that is believed to belong justifiably to every person.

Explanation:

Answer:

Human rights are standards that allow all people to live with dignity, freedom, equality, justice, and peace. Every person has these rights simply because they are human beings.

Explanation:

Human rights are rights inherent to all human beings, regardless of race, sex, nationality, ethnicity, language, religion, or any other status. Human rights include the right to life and liberty, freedom from slavery and torture, freedom of opinion and expression, the right to work and education, and many more.

Discuss with your classmates your conclusion about the effect of temperature on the rate of photosynthesis. Explain how you reached this conclusion.

Answers

Even though the light dependent reactions of photosynthesis are not affected by a change in temperature, the light independent reactions of photosynthesis can be dependent on temperature. They are reactions of enzymes. As the enzymes approach their optimum temperatures the rate increases.

Which of the following best describes the effect of cancer-causing mutations on the cell cycle? The mutations increase the speed of the cycle. The mutations cause the cell to bypass checkpoints in the cycle The mutations eliminate one or more stages of the cycle. The mutations interfere with S stage of the cycle. None of these.

Answers

Answer:

None of these.

Explanation:

Cancer mutations affect cell cycle regulators.

Cell cycle is a highly regulated process by the regulators that can promote cell cycle or inhibit the cycle. Genes that encode for those regulators are classified into two groups:

  • proto-oncogenes-encode for positive regulators such as growth factor receptor. If a cancer mutation occurs in the proto-oncogene it becomes oncogene and its product is overactivated. The increased avtivity of positive regulators leads to abnormal cell division.
  • tumor suppresor-the products of such genes blocks the cell cycle, but after the mutation they become inactive, which leads to uncontrolled cell cycle.
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