BIOLOGY HIGH SCHOOL

Define "prokaryotic cell", and describe some properties of organisms that have prokaryotic cells.

Answers

Answer 1
Answer:

Prokaryotes are unicellular microorganisms that do not have cell nuclei or membrane-bound organelles.

  • According to the type of cell, there are two major evolutionary classes of organisms: prokaryotes and eukaryotes.

  • Prokaryotes are unicellular (single-celled) organisms in which lack membrane-bound organelles such as, for example, mitochondria, chloroplasts, lysosomes) and cell nuclei.

  • In consequence, the genetic material (DNA) in a prokaryotic cell is located in a region of the cytoplasm known as nucleoplasm.

  • Prokaryotes include bacteria (e.g., Escherichia coli) and Archaea (e.g., Pyrolobus fumarii).

In conclusion, prokaryotes are unicellular microorganisms that do not have cell nuclei or membrane-bound organelles.

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Answer 2
Answer:
Prokaryotes are single-celled organisms that are the earliest and most primitive forms of life on earth. As organized in the Three Domain System, prokaryotes include bacteria and archaeans. Some prokaryotes, such as cyanobacteria, are photosynthetic organisms and are capable of photosynthesis.

Many prokaryotes are extremophiles and are able to live and thrive in various types of extreme environments including hydrothermal vents, hot springs, swamps, wetlands, and the guts of humans and animals (Helicobacter pylori). Prokaryotic bacteria can be found almost anywhere and are part of the human microbiota. They live on your skin, in your body, and on everyday objects in your environment.
properties. ..
All prokaryotic cells have a nucleoid region, DNA and RNA as their genetic material, ribosomes that make proteins, and cytoplasm that contains a cytoskeleton, which organizes and supports the parts of the cell. Prokaryotic cells are simpler than eukaryotic cells, and an organism that is a prokaryote is unicellular; it is made up of only one prokaryotic cell.
Prokaryotic cells are usually between 0.1 to 5 micrometers in length (.00001 to .0005 cm). Eukaryotic cells are generally much larger, between 10 and 100 micrometers. Prokaryotic cells have a higher surface-area-to-volume ratio because they are smaller, which makes them able to obtain a larger amount of nutrients via their plasma membrane.

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What must happen for a solar eclipse to occur?a)The moon must pass behind Earth.
b)The moon must be full.
c)The moon's orbit must cross the plane of the ecliptic.
d)The moon's orbit must not cross Earth's penumbra.

Answers

The best answer to the question stated above is letter  C.The moon's orbit must cross the plane of the ecliptic.

>>Solar eclipses happen when the Moon moves between Sun and Earth, blocking the Sun's rays and casting a shadow on Earth.
>>Solar eclipses can happen only during a new Moon.
>>Earth's orbit is called the ecliptic plane as the Moon's orbit must cross this plane in order for an eclipse (both solar as well as lunar) to occur

The moon's orbit must cross the plane of the ecliptic for a solar eclipse to occur. The correct option is C.

A solar eclipse takes place when the moon passes between the sun and the Earth, causing the sun to be partially or fully obscured from certain locations on Earth.

For this alignment, the moon's orbit must intersect the plane of the ecliptic, which is the imaginary plane defined by Earth's orbit around the sun.

During a solar eclipse, the moon casts a shadow on the Earth's surface, blocking or partially blocking the sunlight.

This can result in a total solar eclipse, where the sun is completely covered, or a partial solar eclipse, where only a portion of the sun is obscured.

Thus, the correct option is C.

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Desert plants are often widely spaced due to competition for rainwater. Please select the best answer from the choices provided T F

Answers

That statement is true

Due to extreme amount of heat, the rain water that falls on the dessert will quickly be evaporated. To collect more of it, usually the roots of the dessert plants are really close to the surface

If the plants are close to each other, they simply won't be able to collect any water, so they spread evenly throughout the dessert

Answer:

TRUE

Desert plants are often widely spaced due to competition for rainwater.

Explanation:

edge 2020!

Which of the following activities does NOT contribute to global warming?A.) Driving cars
B.) Releasing gases
C.) Walking
D.) Burning fuel

Answers

WALKING does not contributes to global warming. Global warming is the gradual increase in the total temperature of the earth as a result of green house effects. Green house effects is caused by increased accumulation of carbondioxide and other polutants in the earth's atmosphere. Fossils fuels and gases are the major contributors global warming because their burning add carbon dioxide to the atmosphere.

c. Explain why the osmolarity of some of the liquid solutions changed after the red blood cell was added. Describe the processes of the changes to the concentration. Your description should include a minimum of 3 processes. Be specific to receive the full credit. (6pts)

Answers

Answer: lots of words >_>

Explanation:

The osmolarity of a liquid solution can change after a red blood cell is added due to processes involving changes in concentration. Here is a step-by-step explanation of these processes:

1. When a red blood cell is added to a liquid solution, it will attempt to reach equilibrium with its surroundings. Red blood cells are surrounded by a semipermeable membrane that allows certain substances to pass through while restricting others.

2. If the concentration of solutes (such as ions or molecules) in the liquid solution is higher than that inside the red blood cell, water will move from an area of lower solute concentration (inside the cell) to an area of higher solute concentration (the solution) through osmosis.

3. This movement of water from inside the red blood cell to the solution will cause the cell to shrink, leading to a decrease in the osmolarity of the solution. The solute concentration in the solution increases as water leaves the cell.

4. On the other hand, if the concentration of solutes in the liquid solution is lower than that inside the red blood cell, water will move from the solution into the cell, causing it to swell. This leads to an increase in the osmolarity of the solution since the solute concentration decreases as water enters the cell.

5. The extent of the change in osmolarity depends on the initial concentrations of solutes in the solution and inside the red blood cell. If the concentrations are similar, there may be little to no change in osmolarity.

In summary, when a red blood cell is added to a liquid solution, the osmolarity of the solution can change due to the movement of water through osmosis. Water moves from areas of lower solute concentration to higher solute concentration, resulting in either the shrinking or swelling of the red blood cell and a corresponding change in the concentration of solutes in the solution.

hope this helps :D

Does the DNA in the skin cell have the same backbone as DNA in the brain cell of the same organism?

Answers

no it does not I hope this helps

How do adrenaline help in dealing with emergency situations

Answers

Adrenaline helps in emergency situation by providing energy so that the major muscles of the body can respond to the perceived threat.
In danger, the brain then sends nerve impulses to the adrenal gland in the kidneys. When the nerve signal reaches the adrenal gland, chromaffin cells, in the medulla of the adrenal gland, release epinephrine or adrenaline. It then enters the bloodstream. It is thus carried around the body to cells in various locations, where it initiates several responses.
1. Adrenaline, along with another hormone called glucagon, is responsible for the breakdown of glycogen in liver cells. Glycogen is a form of energy storage. This gives energy to the muscles
2. Adrenaline effects the skin also. Restriction of the arteries is caused by the binding of epinephrine/adrenaline to some alpha-adrenergic receptors. This cuts off blood supply to the skin. This results in the contraction of the smooth muscle cells in the skin, which cause the raising of the hairs on the surface of the skin. 
3. The lungs contain smooth muscle. Epinephrine causes smooth muscles to relax. Specifically, epinephrine binds to beta-2-adrenergic receptors on bronchiole muscle cells. This allows the bronchioles to relax, which enables intensified respiration.
4. Adrenaline binds to beta-adrenergic receptors on heart muscle cells. This causes the contraction rate of the heart to increase. This ultimately leads to increased blood supply to the tissues in the body.
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