Question

In: Biology

1. Which of the following factors would decrease the rate of diffusion? (Select all that apply)...

1. Which of the following factors would decrease the rate of diffusion? (Select all that apply)

Check All That Apply

increased molecular weightincreased molecular weight
decreased molecular sizedecreased molecular size
larger concentration gradientlarger concentration gradient
denser mediadenser media
smaller concentration gradient

2.

Which of the following factors would increase the rate of diffusion? (Select all that apply)

Check All That Apply

increased molecular weightincreased molecular weight
decreased molecular sizedecreased molecular size
larger concentration gradientlarger concentration gradient
denser mediadenser media
thinner mediathinner media

Expert Solution

Question 1-

The factors, reducing the rate of diffusion, are-

A. Increased molecular weight.

Explanation - Diffusion is the phenomenon where the solute molecules move from a high concentration to lower concentration. At the end of diffusion, solute concentration is equal in all parts of the solvent. The movement of the solute molecules in the solvent is called Brownian motion. The Brownian motion will decrease if the molecular weight of the solute increase. Heavier molecules need more time to travel a certain distance, compared to the lighter molecules. As a result, the rate of diffusion will decrease.

B. Denser media.

Explanation - The speed of Brownian motion will decrease if the concentration of the solvent increases. In denser media, the number of molecules per unit area is higher compared to the thinner media. So in denser media, each solute molecule collides with more number of solvent molecules while moving. As a result, the speed of Brownian motion is decreased and the rate of diffusion decreases.

C. Smaller concentration gradient.

Explanation - The concentration gradient is less, this means more number of solute molecules are present in the part with less solute concentration compared to the part with less solute concentration in case of the higher concentration gradient. So, each solute molecule collides with more number of solute molecules while moving to the part with less solute concentration. As a result, the rate of diffusion decreases.

[Decreased molecular size increases the rate of diffusion. If the size of a solute molecule decreases, its surface area will also decrease. As a result, it will come in contact with less number of solvent molecules, i.e., it will collide with less number of solvent molecules. So, the speed of Brownian motion will increase and the rate of diffusion will increase. Hence this option is false.]

Question 2 -

The factors, increasing the rate of diffusion, are -

A. Decreased molecular size.

Explanation - Decreased molecular size increases the rate of diffusion. If the size of a solute molecule decreases, its surface area will also decrease. As a result, it will come in contact with less number of solvent molecules, i.e., it will collide with less number of solvent molecules. So, the speed of Brownian motion will increase and the rate of diffusion will increase.

B. Larger concentration gradient.

Explanation - The concentration gradient is large, this means less number of solute molecules are present in the part with less solute concentration compared to the part with less solute concentration in case of the lower concentration gradient. So, each solute molecule collides with less number of solute molecules while moving to the part with less solute concentration. As a result, the rate of diffusion increases.

C. Thinner media.

Explanation - The speed of Brownian motion will increase if the concentration of the solvent decreases. In thinner media, the number of molecules per unit area is less compared to the denser media. So in thinner media, each solute molecule collides with less number of solvent molecules while moving. As a result, the speed of Brownian motion is increased and the rate of diffusion increases.

gladiator answered 1 year ago

Which Of The Following Statements Are True? Select All That Apply. A. All other factors being...

Which Of The Following Statements Are True? Select All That Apply. A. All other factors being the same, dispersion forces between linear molecules are greater than dispersion forces between molecules whose shapes are nearly spherical. B. For the halogens, the dispersion forces increase while the boiling points decrease as you go down the column in the periodic table from F2 to I2 . C. For molecules with varying molecular weights, the dispersion forces may not become stronger as the molecules...

estion 14 Which of the following factors would decrease (slow down) diffusion rates? greater membrane surface...

estion 14 Which of the following factors would decrease (slow down) diffusion rates? greater membrane surface area higher temperature higher molecular weight steep gradient None of the above

Which of the following are TRUE? Select all that apply. A probability of 1 is the...

Which of the following are TRUE? Select all that apply. A probability of 1 is the same as a probability of 100% The difference between interval and ordinal data is that interval data has a natural zero. If you are doing a study and the population is Americans, the easiest type of study to run would be a simple random sample. If your population is 80% female and your sample is 60% male, there is undercoverage bias. In order to...

Which of the following scenarios contain nonbiased samples? Select all that apply. Select all that apply:...

Which of the following scenarios contain nonbiased samples? Select all that apply. Select all that apply: To estimate the mean height of students at her school, Kelly collects data by selecting a random group of students within her classroom. Elizabeth wants to estimate the mean grade point average of students at her school. She collects data by recording the grade point average of every 25th student on the list of students after a randomly selected first student. Andrew wants to...

Which of the following are TRUE about the Federal Funds Rate? (Select all that apply.) a....

Which of the following are TRUE about the Federal Funds Rate? (Select all that apply.) a. It is influenced by the Federal Reserve b. It is a rate at which banks can borrow long-term cash reserves c. It is set in the market d. It is the rate at which banks can borrow cash reserves on an overnight basis e. It is the rate at which individual investors may borrow cash from the Federal Reserve

1. The marginal rate of substitution is ________________ (Select all that apply)

1. The marginal rate of substitution is ________________ (Select all that apply)a. Equal to the slope of the budget line at an optimal point if the optimal point is not at a corner.b. How much of each good a consumer can afford.c. The amount of one good an individual would be willing to trade for a different good and be just as well off.d. The slope of the indifference curve.e. Equal to the price ratio at an optimal point if...

1. Which of the following statements are true? Select all that apply. Select one or more:...

1. Which of the following statements are true? Select all that apply. Select one or more: a. Earnings per share is calculated by dividing retained earnings by the number of shares of common stock outstanding. b. The creditors of a firm must be satisfied before any earnings can be distributed to the common shareholders. c. When referring to ratio comparisons, time-series analysis compares a firm to that of an industry leader. d. The operating profit margin must take into account...

1) Which of the following is not true? Select all that apply: a) Advances in technology...

1) Which of the following is not true? Select all that apply: a) Advances in technology are only possible in advanced economies. b) Advances in technology have no impact on worker productivity c) Advances in technology increase worker productivity d) Technological change is a combination of invention and innovation. 2) A common measure of productivity used to track growth of GDP per capita is ________________ Select the correct answer below: a) quantity of labor used in production b) dollar value...

16. Which of the following statements concerning alveoli would be correct? SELECT ALL THAT APPLY!! a....

16. Which of the following statements concerning alveoli would be correct? SELECT ALL THAT APPLY!! a. Pulmonary surfactant of the alveoli is secreted by Type II alveolar cells. b. When intra-alveolar pressure becomes greater than atmospheric pressure expiration will occur. c. The walls of the alveoli are very thin and are surrounded by a network of capillaries so that air and blood are separated by only a very thin respiratory membrane. d. Alveoli are the site of gas exchange in...

Which of the following statements is incorrect? Select all that apply.

Which of the following statements is incorrect? Select all that apply. The eukaryotic ribosome uses both the 5' cap and the 3' tail to correctly position the ribosome on the initation codon GTP is hydrolyzed by aminoacyl-tRNA synthetases to prepare amino acids for attachment to tRNAs The peptidyl-transferase activity of the ribosome is catalyzed by one of the protein domains of the large ribosomal subunit The Shine-Dalgarno consensus sequence is located downstream of the initiation codon and base pairs with the 16S rRNA of...