BIOLOGY HIGH SCHOOL

If you cut your knee, pus, which is caused by _____, may form. medicinal material excreted by macrophages the death of macrophages pathogens trying to infect the area blood cells losing their hemoglobin

Answers

Answer 1
Answer: If you cut your knee, pus, which is caused by the death of macrophages may form. 
Answer 2
Answer:

Answer:

Death of macrophages

Explanation:

  • Pus is formed at a site of infection and consists of a protein-rich fluid which is often yellowish white in color.
  • This is caused because the immune cells that reach the site of infection, die and build up in the area.
  • These immune cells include neutrophils and macropahges.
  • When there is an infection, these neutrophils and macrophages reach the site of injury as they are a part of the innate immune system to control the infection and then when they die and if not cleared from the site of the infection, then a build-up of pus occurs.

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Which of the following is a scientific species designation? human
Homo sapien
Homo
sapien

Answers

Answer: Homo sapien is a scientific species designation.

Homo sapien is a scientific designation for modern human species. The name to Homo sapien was given by the father of modern biological classification, Carolus Linnaeus in 1758. Homo is the genus to which human belongs and sapien means the only surviving species of the genus Homo.

Final answer:

In scientific nomenclature, a species is designated by a two-part name, which includes the genus and species name. 'Homo sapien' is the correct answer.

Explanation:

In scientific nomenclature, a species is uniquely designated by a two-part name: the genus name and the species name. Within the options provided, Homo sapien is the correct scientific species designation. 'Homo' is the genus, which includes humans and our closest extinct relatives, and 'sapien' denotes our specific species within the genus Homo. Thus, a combination of both terms - Homo sapien - correctly designates the human species.

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Which type of pollution includes CFCs and smog? Air, land, water or volcanic

Answers

CFCs and smog are examples of air pollution.

CFCs (containing atoms of carbon, chlorine and fluorine)are a component of aerosols sprays, refrigerants etc. These chemical compounds are non reactive in the lower atmosphere but the CFCs react with UV radiation in the sunlight and release inorganic chlorine. This chlorine is the main cause of the holes present in the ozone shield (shield that protects us from harmful UV rays) in the polar regions.

Smog refers to the haze or fog that occurs as a result of air pollution (caused by burning of fossil fuels etc)

Chlorofluorocarbons (CFC) and smogs are examples include of air pollutants. Details about pollution can be found below.

What is pollution?

Pollution is the release of toxic substances called pollutants into the environment, whether air, water and water.

Pollutants are of various sources and can be from varying sources as follows:

  • Air
  • Water
  • Land

Chlorofluorocarbons and smogs are examples include of air pollutants.

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A food chain is made up of interrelated food webs.

Answers

False, it's the other way round. Food webs consist of many food chains joined together.

A researcher wants to test how diets A and B affect the weight loss of rabbits. She has 20 rabbits to use, but all of the rabbits are different sizes, which might affect how much weight they lose. The researcher decides to group the four smallest rabbits in one group, the next four smallest rabbits in another group, etc., until the final group has the four largest rabbits. Then, from each group she randomly selects two rabbits to have diet A, and the remaining rabbits in the groups have diet B.Select all that apply:
A. This is an example of a block design.
B. This is an example of a completely randomized experiment
C. This is an example of a matched pairs experiment.
D. The treatments are diets A and B.
E. The treatment is how much weight a rabbit loses.
F. The experimental units are the 20 rabbits.
G. The experimental units are diets A and B

Answers

Answer:

A. This is an example of a block design.

D. The treatments are diets A and B.

F. The experimental units are the 20 rabbits.

Explanation:

The randomized block designs are used in experiment when there is only one variable of prime importance but along with it there are several nuisance factors. As in this case, the prime variable is the impact on weight of rabbits when they consume one the given diets. However, several nuisance factors are unequal weights of the rabbit, different class of rabbits, eating habits of rabbit, time of feeding etc.  

Treatment in an experiment is the independent variable that is varied to measure its impact on the subjects of the experiment.  

Here these independent variables are diet type A and B and the subject is the group of 20 rabbits. Subjects are also referred as experimental unit i.e on which the experiment is being conducted

Hence, option A, D and F are correct

What are the different blood types

Answers

There are four blood types they are A, B, AB, and O

A neuron's sodium channels are malfunctioning and will no longer open. How would this prevent the cell from changing its polarity, and why?

Answers

The cell will not be able to depolarize due to unavailability of sodium ions.

What is the role of sodium gates in action potential?

  • Sodium voltage-gated channels can be either closed, open, or inactive.
  • Voltage-gated sodium channels are closed when at rest. Both an activation gate and an inactivation gate are present in voltage-gated sodium channels.
  • Although the inactivation gate is open, the activation gate is closed. This conformation is closed but capable of opening. Some of the activation gates open as a result of membrane depolarization brought on by a stimulus.
  • Both the activation and inactivation gates will be opened at this point. As sodium ions enter the cells, nearby activation gates will open.
  • A greater amount of sodium will enter the cells as a result, initiating an action potential.
  • Both gates open when certain depolarization thresholds are reached. Action potential increases to its maximum as sodium rushes into the cell.
  • The inactivation gate will gradually close and the permeability of the membrane to sodium ions will decrease. The channel is now in a state known as "closed but not capable of opening."

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Answer:

it could not depolarize because the cell cannot become more positively charged.

Explanation:

When sodium gates open, depolarization occurs, changes the charge of the ion from negative to positive. Therefore, if the sodium channels no longer open, the flow of sodium into the cell that changes the charge from - to + and depolarization would not occur.

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