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Svetach [21]
2 years ago
10

2. Describe the permeability of cell membranes. How to substances cross cellmembranes? Utilize the terms bi-polar, semi-permeabl

e, diffusion, active transport, membrane
proteins, endocytosis, exocytosis, vesicles, phagocytosis, pinocytosis, etc. (This should be 3-4paragraphs long)
Biology
1 answer:
Tju [1.3M]2 years ago
6 0

The permeability of a cell membrane simply means the ability of the cell membrane to allow solutes and solvents diffuse or pass through it

In biology, substances moves in and out of cells through semi-permeable membranes of the cell in a function of different metabolic processes such as:

  • Osmosis: This is the movement of substances from a region of low concentration to a region of high concentration
  • Diffusion: This is the movement of substances from a region of high concentration to a region of low concentration
  • Phagocytosis: This involves the movement of substances through phagocytic bacteria
  • Endocytosis: This involves the movement of substances into the cell
  • Exocytosis: This involves the movement of substances outside the cell environment
  • Pinocytosis and others

So therefore, thee permeability of a cell membrane simply means the ability of the cell membrane to allow solutes and solvents diffuse or pass through it

Learn more about the permeability of cell membrane:

brainly.com/question/19485474

#SPJ1

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Which of these processes happens randomly and which are not considered random? Artificial selection, natural selection, sexual s
Doss [256]

Answer:

Artificial selection is non-random whereas natural selection, and sexual selection are random selection.

Explanation:

Artificial selection is considered non-random whereas natural selection, and sexual selection are considered as random selection because in Artificial selection, humans select the mating animals in order to acquire the desired characteristics and features in the offspring while on the other hand, natural selection, and sexual selection are happen randomly without the intervention of humans, it occurs naturally so we can conclude that artificial selection is non-random whereas natural selection, and sexual selection are random selection.

5 0
3 years ago
What are some “creatures/animals” that Rex imitates?
N76 [4]
<span>Rex imitates a dog. The lead soldier controls the robot by using simple commands like “stop”, “fetch” and “heel”. It is designed to help the soldiers on operations and missions where it accompanies the lead soldiers from a distance, using the developed technology and patented by IAI. </span>
4 0
3 years ago
What is still lacking in the hypothesis of an asteroid impact as the cause of the end-cretaceous mass extinction?
Doss [256]

A convincing explanation of why some lineages survived while others vanished is still lacking in the hypothesis of an asteroid impact as the cause of the end-cretaceous mass extinction.

<h3>What is an asteroid?</h3>

One of the smaller planets in the inner Solar System is an asteroid. Asteroids are metallic or rocky bodies without an atmosphere, ranging in size from 1-meter pebbles to a dwarf planet with a diameter of over 1000 km.

The majority of the one million or more known asteroids are concentrated in the main asteroid belt, which is 2 to 4 AU from the Sun and between the orbits of Mars and Jupiter. The three categories of asteroids that are typically recognized are C-type, M-type, and S-type.

These were given their names and are frequently associated with, respectively, carbonaceous, metallic, and silicaceous compositions. The largest asteroid, Ceres, has a diameter of over 1,000 km (600 mi), making it a dwarf planet.

To learn more about an asteroid with the help of given link:

brainly.com/question/11996385

#SPJ4

8 0
1 year ago
HELP ME PLEASE! List the steps scientists for using technology to find the half-life of an isotope.​
liubo4ka [24]

For radioactive materials with short half-lives, you use a very sensitive calibrated detector to measure how many counts per second it is producing. Then using the exact same set up you do the same at a latter time. You use the two readings and the time between them to determine the half-life. You don’t have to wait exactly a half-life, you can do the math with any significant time difference. Also, you don’t need to know the absolute radioactivity, as long as the set up is the same you only need to know fraction by which it changed.

For radioactive materials with long half-lives that won’t work. Instead you approach the problem differently. You precisely measure the mass of a very pure sample of the radioactive material. You can use that to calculate the number of atoms in the sample. Then you put the sample in a counter that is calibrated to determine the absolute number of disintegrations happening in a given time. Now you know how many of them are disintegrating every second. You use the following equations:

Decays per Second = (Number of Atoms) x (Decay Constant)

Half-life = (Natural Log of 2) / (Decay Constant)

And you can calculate the half-life

Hope it helps :)

Mark it as brainliest pls :)

6 0
3 years ago
Sarah wants to know which brand of nail polish lasts the longest without chipping.She buys 4 types of nail polish - Essie (which
shusha [124]

Answer:try a gel manicure or pedicure

Explanation:

Gel manicures although they run higher risks of skin cancer from the ultraviolent lamp used to dry the polish do last on average 50% longer.

7 0
2 years ago
Read 2 more answers
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