All categories

3 years ago

Which of the following is a characteristic of active transport? Check all answers that apply.

Physics

2 answers:

vlada-n [284]3 years ago

5 0

B. It moves substances against a concentration gradient. It requires energy from the cell to.

Hope this helps :)

mojhsa [17]3 years ago

5 0

The following are characteristics of active transport:

B) It moves substances against a concentration gradient.

C) It requires energy from the cell.

<h3>Further Explanation</h3>

Active and Passive Transport

Passive transport is the movement of particles through a membrane which requires no extra energy. It happens spontaneously because there is an imbalance in the amount of solutes or difference in concentration inside and outside the membrane. In order to reach equilibrium or a state where the amount of solute or concentration on both sides is the same, some substances have to cross the membrane.

When substances move from a region of high concentration to low concentration, it is said that the substances are moving down a concentration gradient. This process is spontaneous meaning it does not require energy to occur. The opposite is true for active transport which requires additional energy for it to happen.

Movement of Substances (Passive Transport)

In diffusion, solutes move from a concentrated area to a less concentrated area.

In osmosis, the water molecules move from an area with more water molecules (lower concentration of solutes) to the area with less water molecules (higher concentration of solutes).

<h3 /><h3>LEARN MORE</h3>

semipermeable membrane brainly.com/question/737703
diffusion brainly.com/question/1386629

Keywords: osmosis, diffusion, active transport

You might be interested in

A solid uniform disk of diameter 3.20 m and mass 42 kg rolls without slipping to the bottom of a hill, starting from rest. if th

aalyn [17]

Answer:

Height reached by the ball, h = 3.57 meters

Explanation:

It is given that,

Mass of the disk, m = 42 kg

Diameter of the disk, d = 3.2 m

Radius, r = 1.6 m

Angular speed of the disk, $\omega=4.27\ rad/s$

The kinetic energy of the disk is equal to its potential energy. Using the conservation of energy as :

$\dfrac{1}{2}mv^2+\dfrac{1}{2}I\omega^2=mgh$

$\dfrac{1}{2}mv^2+\dfrac{1}{2}(mr^2/2)\omega^2=mgh$

$\dfrac{1}{2}v^2+\dfrac{1}{2}(r^2/2)\omega^2=gh$

$\dfrac{1}{2}(r\omega)^2+\dfrac{1}{2}(r^2/2)\omega^2=gh$

$\dfrac{1}{2}(1.6\times 4.27)^2+\dfrac{1}{2}(1.6^2/2)\times 4.27^2=gh$

$h=\dfrac{35.0071}{9.8}$

h = 3.57 meters

So, the solid disk will reach to a height of 3.57 meters.

8 0

3 years ago

A wire carries a current of 0.66 A. This wire makes an angle of 58° with respect to a magnetic field of magnitude 5.50 10-5 T. T

Oliga [24]

Answer:

The length of the wire is "1.93 m".

Explanation:

Given:

Current,

I = 0.66 A

Angle,

$\Theta$ = 58°

Magnetic field of magnitude,

F = $5.5\times 10^{-5}$ N

The length of the wire will be:

⇒ $F = B\times I\times L\times Sin \Theta$

or,

⇒ $L = \frac{F}{B\times I\times Sin \theta}$

By putting the values, we get

$=\frac{5.5\times 10^{-5}}{0.66\times 5.1\times 10^{-5}\times Sin \ 58^{\circ}}$

$=\frac{5.5}{2.828}$

$=1.93 \ m$

6 0

3 years ago

I need help on B. please help me

yuradex [85]

I think unbalanced forces is one of the reasons

3 0

3 years ago

A 1 mW laser beam is incident onto a detector. Determine the fractional fluctuation in number of photons intercepted by the dete

Ugo [173]

Answer:

(a) $625 photons$

(b) $625\times 10^{6}photons$

Explanation:

Given that , the power of the laser beam is,

$P=1 mW\\P=1\times 10^{-3} W$

and time is given is,

$t=1\mu s\\t=10^{-6}s$

Now the energy formula for the laser beam is,

$E=P\times t$

Now,

$E=10^{-3}\times 10^{-6} \\E=10^{-9}J$

(a) The value of energy is given,

$E_{1}=10MeV\\E_{1}=10\times 10^{6}\times 1.6\times 10^{-19}J\\ E_{1}=16\times 10^{-13}J$

Now the no of photons's fraction fluctuation is,

$n=\frac{E}{E_{1} }\\ n=\frac{10^{-9} }{16\times 10^{-13} }\\ E_{1}=625 photons$

Therefore the no of photons is $625 photons$ .

(b)The value of energy is given,

$E_{z}=10eV\\E_{z}=16\times 10^{-19}J$

Now the no of photons's fraction fluctuation is,

$n=\frac{E}{E_{z} }\\ n=\frac{10^{-9} }{16\times 10^{-19} }\\n=625\times 10^{6}photons$

Therefore the no of photons is $625\times 10^{6}photons$ .

5 0

3 years ago

If the light rays in the incident ray originate at 20º from the surface...

Ainat [17]

Given :

The light rays in the incident ray originate at 20º from the surface.

To Find :

The angle for the incident ray.

Solution :

We know angle of incidence is measured from perpendicular to the surface .

So,

$\theta_i = 90^o - 20^o\\\\\theta_i = 70^o$

Now, we know by law of reflection :

Angle of reflection = Angle of incident

$\theta_r = 70^o$

Therefore, the angle of incident and reflection is 70° each.

5 0

3 years ago