1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
azamat
2 years ago
14

Which of the following best describes a DNA molecule

Biology
1 answer:
brilliants [131]2 years ago
5 0

Answer:

A. double helix.

Explanation:

You might be interested in
Which substances contain nitrogen?
Luda [366]

Answer:

protiens

Explanation:

in protiens in cells have nightogen

5 0
3 years ago
Read 2 more answers
Why did Earth and Venus evolve so differently? Why is Earth's atmosphere rich in oxygen and poor in carbon dioxide, whereas the
Ratling [72]
The earth will have lack  of oxygen and the earth's temperature will increase in heat rapidly.
4 0
3 years ago
What happens during an equinox? A. The seasons are reversed in each hemisphere. B. One hemisphere has an equinox, while the othe
Readme [11.4K]
C. there is an equal amount of day and night everywhere on earth.
6 0
3 years ago
Is the movement of water along the concentration gradient
Nuetrik [128]

Answer:

<em>- Is the movement of water along the concentration gradient: </em><em>Osmosis</em><em>. </em>

<em>- Is the use of energy to move the particles against the concentration gradient: </em><em>Active transport</em><em>. </em>

<em>- Is the movement of particles by diffusion without energy: </em><em>Simple diffusion</em><em>. </em>

<em>- Is the movement of particles along the concentration gradient: </em><em>Passive transport</em><em>.</em>

Explanation:

The mechanisms of cellular transport involve all the processes that the cell carries out to incorporate substances into its interior or send them to the extracellular space, through its semipermeable cell membrane.

<h3>- Osmosis</h3>

Is a type of transport that consists of the passage of water from a space with a lower concentration of solutes to one with a higher concentration, in order to reach equilibrium, following a concentration gradient.

The concentration gradient is given by the difference in concentration between two substances, which indicates the direction in which molecules, such as water, should move from one place to another.

<h3>- Active transport</h3>

Unlike passive transport mechanisms, which depend on a concentration gradient that determines the movement of particles, in active transport there are two characteristics that define it:

The passage of substances into the cell against a concentration gradient.

The use of energy to carry out this process.

In this case, the passage of substances through the cell membrane will be according to the requirements of the cell, or when they cannot pass through the membrane.

<h3>- Simple diffusion</h3>

According to the characteristics of the cell membrane, some substances can pass freely through it while others require special mechanisms. When a molecule is able to pass through the membrane without the use of special mechanisms or energy we speak of simple diffusion.

In a cell membrane, whose composition is by hydrophobic or non-polar lipid molecules, simple diffusion allows the passage of non-polar molecules, gases and alcohol.

<h3>- Passive transport</h3>

Refers to the mechanism of entry and exit of substances from the cell that does not require the use of energy.

The mechanisms involved in the passive transport of the cell are simple diffusion, osmosis, facilitated diffusion - which requires special conveyors or channels - and ultrafiltration, which depends on hydrostatic pressure. Examples of substances using this mechanism are lipid molecules, water and electrolytes.

Learn more:

Lipidic bilayer and cellular transport brainly.com/question/6955159

3 0
3 years ago
What does demographics mean?
JulijaS [17]
Statistical data relating to the population and particular groups within it.
3 0
3 years ago
Read 2 more answers
Other questions:
  • Describe a subculture that you are familiar with. What are the characteristics that identify it as a subculture?
    11·2 answers
  • What is the scientific word for a flowering plant?
    15·1 answer
  • Minerals absorbed by the roots are transmitted through the plant in the _______.
    9·2 answers
  • The shadow zone exists because​
    12·1 answer
  • The simplest animals that are bilaterally symmetrical and triploblastic (composed of three fundamental layers) are the Platyhelm
    14·1 answer
  • What is a characteristic common to both diffusion and active transport
    5·1 answer
  • What evidence suggests that the ocean influences climate change?
    7·2 answers
  • How do
    6·1 answer
  • In guinea pigs, smooth coat (S) is dominant over rough coat (s). If an SS guinea pig is crossed with an ss guinea pig, what poss
    8·2 answers
  • Help anyone i will mark you brainliest so pls...
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!