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
Natali [406]
4 years ago
11

If a crystal of potassium permanganate is placed on agar and after 15 minutes the diameter of the area over which the dye has sp

read is 15 mm, the average diffusion rate is
Biology
1 answer:
Vadim26 [7]4 years ago
7 0

Answer:

Diffusion rate is 1.96 × 10^{-3} cm^{2}/s

Explanation:

Diffusion is the process in which the molecules of a substance propagates from a region of higher concentration to region of lower concentration through a semi-permeable membrane.

diffusion rate = \frac{area}{time}

Given that; diameter = 15 mm, time = 15 minutes.

The dye spread in a circular form, so that;

area = \pir^{2}

r = \frac{diameter}{2} = \frac{15}{2} = 7.5 mm = 0.75 cm

area = \frac{22}{7} × (0.75)^{2} = 1.7679 cm^{2}

time = 15 minutes = 15 × 60 = 900 seconds

So that;

diffusion rate = \frac{1.7679}{900}

                      = 0.0019643 cm^{2}/s

Diffusion rate is 1.96 × 10^{-3} cm^{2}/s

You might be interested in
Can someone pls… im so close to being done
likoan [24]

Answer:

Because liquids flow freely, they take the shape of the container they are in, but have a definite volume. Like liquids, the shape of a gas changes with the container. This is because the atoms in a gas move rapidly and freely to fill any available space. Unlike liquids, the volume of a gas changes depending on the container it is in.

Explanation:

5 0
3 years ago
My answer is c
arlik [135]
<span>C.
has strong legs for running

</span>
8 0
3 years ago
Using a key which organism has the largest population? Which organism has the smallest population?
Vikentia [17]
Largest- Oak trees Smallest- Toads
4 0
3 years ago
A primigravid client in early labor with abruptio placentae develops disseminated intravascular coagulation (dic). which agent s
Novosadov [1.4K]

The agent would prescribe the fresh-frozen platelets. This is a blood produce made from the liquid share of entire blood. It is used to treat circumstances in which there are low blood coagulation factors (INR>1.5) or small levels of other blood proteins.

4 0
4 years ago
Oct4 is an embryonic stem cell specific transcription factor. ESCs grown in petri dishes are fed media that contain basic fibrob
GarryVolchara [31]

Answer:

miR-223 inhibits the expression of the fibroblast growth factor (bFGF) gene, and thereby ESCs cells maintain their undifferentiated state .

Explanation:

Non-coding RNA (ncRNAs) are molecules that regulate gene expression, thereby playing important biological functions in cell differentiation, cell cycle, apoptosis, etc. MicroRNAs (miRNAs) are a type of ncRNAs capable of controlling gene expression patterns by regulating mRNA stability and by suppressing their translation into proteins. It has been shown that miRNAs function by imperfectly base-pairing with the 3′ UTR of target mRNAs (Pillai et al. 2005).

Citation:

R. S. Pillai, S. N. Bhattacharyya, C. G. Artus,   T.  Zoller, et al. (2005). Inhibition of translational initiation by Let-7 MicroRNA in human cells. Science, 309(5740), 1573-1576.

4 0
3 years ago
Other questions:
  • Sodium chloride is made up of a positive sodium ion and a negative chloride ion. Therefore, it is an example of
    9·1 answer
  • What type of mountain is most likely to form when plates with edges that have oceanic lithosphere collide?
    13·1 answer
  • The United States' __________ was patterned after Germany's autobahn.
    10·2 answers
  • Approximately what percentage of u.s. adults are considered overweight or obese?
    6·1 answer
  • Someone who suddenly loses the ability to identify objects by feeling them has probably suffered damage to what area of the cere
    9·1 answer
  • Why is reproduction considered as a life function?
    9·2 answers
  • What is Bromthymol Blue? Why is the BTB in the beaker green?
    14·1 answer
  • Based on thomsons plum pudding model of the atom what did rutherford expect to happen
    8·1 answer
  • What is the corresponding mRNA sequence from the DNA strand CGA TTA CAG
    5·1 answer
  • 15. What is atherosclerosis?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!