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13 Dec 2019

1. True or False- The Diffusion of a solute in a solution from an area of higher concentration to an area of lower concentration requires ATP and is not affected by temperature changes.

2. True or False- Osmosis is associated with the net movement of water, from a region of low to high solute concentration, across a semipermeable membrane.

3. Which ion is most responsible for the initial change (depolarization) in membrane potential during the action potential?

A. Na+

B. K+

C. Ca++.

D. Cl-

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Related questions

I have this questions for my homework i need help with them look please it is important i need help so please give me the correct answers for each question and also please be clear to understand and aslo be correct it is very important becuase i need them so i really need the right answers. please help me and be correct and clear it is important ok

Question 5

At a constant temperature, if you increase the number of unsaturated fatty acid chains in the phospholipid, the membrane will become......

less fluid
more fluid
fluidity will be unchanged

Question 6

Bacteria in a hot spring at 80 degrees celsius would be expected to have ______________ in their cell membrane

high proportions of saturated phospholipids
high proportions of unsaturated phospholipids
an equal ratio of saturated to unsaturated phospholipid

Question 7

Membrane proteins have an important role in membrane fluidity

True
False

Question 8

The HIV virus can't attach to cells that have a mutation in the CCR5 gene and so such individuals are resistant to HIV. What population of people have a higher incidence of the mutant CCR5 gene and why?

europeans because their ancestors survived the bubonic plague
North Americans because their ancestors survived small pox
europeans because they have a longer evolutionary past with HIV
Africans because they have a longer evolutionary past with HIV

Question 9

Nematode trapping fungi have ______________ molecules called ______________ that recognize specific carbohydrates on the surface of the nematode worms. This is how a fungus can recognize that its prey, the nematode worm, has wriggled into the loop. Write two words on lowercase separated by a space with no other syntax

Question 10

Diffusion requires energy

True
False

Question 11

The net direction of molecule movement when molecules diffuse is

down their concentration gradient
random directions

Question 12

In osmosis, water molecules from a solution of higher solute concentration cross a semi-permeable membrane into a solution of lower solute concentration?

True
False

Question 13

Which best defines osmosis?

In osmosis, water from a solution of lower solute concentration move across a semi-permeable membrane into a solution of higher solute concentration?
In osmosis, water from a solution of higher solute concentration move across a semi-permeable membrane into a solution of lower solute concentration?

Question 14

Animal cells placed into a hypotonic solution would most likely?

lyse (burst)
shrink
remain unchanged in size

Question 15

Glucose and amino acids move into cells via carrier proteins, the same protein can move glucose or amino acids

True
False

Question 16

ATP powered pumps move substances into and out of cells by diffusion?

True
False

Question 17

For every 3 Na ions moved out, 2 K ions are moved into a cell by one cycle of the sodium-potassium pump.

True
False

Question 18

Bulk transport of fluid and any of the substances within that fluid is called

pinocytosis
phagocytosis
receptor-mediated endocytosis
exocytosis

I have this questions for my homework i need help with them look please it is important i need help so please give me the correct answers for each question and also please be clear to understand and aslo be correct it is very important becuase i need them so i really need the right answers. please help me and on Questions 6 and 9 please help me with it hope you can help me with the correct answers please

Question 5

At a constant temperature, if you increase the number of unsaturated fatty acid chains in the phospholipid, the membrane will become......

less fluid
more fluid
fluidity will be unchanged

Question 6

Bacteria in a hot spring at 80 degrees celsius would be expected to have ______________ in their cell membrane

high proportions of saturated phospholipids
high proportions of unsaturated phospholipids
an equal ratio of saturated to unsaturated phospholipid

Question 7

Membrane proteins have an important role in membrane fluidity

True
False

Question 8

The HIV virus can't attach to cells that have a mutation in the CCR5 gene and so such individuals are resistant to HIV. What population of people have a higher incidence of the mutant CCR5 gene and why?

europeans because their ancestors survived the bubonic plague
North Americans because their ancestors survived small pox
europeans because they have a longer evolutionary past with HIV
Africans because they have a longer evolutionary past with HIV

Question 9

Nematode trapping fungi have ______________ molecules called ______________ that recognize specific carbohydrates on the surface of the nematode worms. This is how a fungus can recognize that its prey, the nematode worm, has wriggled into the loop. Write two words on lowercase separated by a space with no other syntax

Question 10

Diffusion requires energy

True
False

Question 11

The net direction of molecule movement when molecules diffuse is

down their concentration gradient
random directions

Question 12

In osmosis, water molecules from a solution of higher solute concentration cross a semi-permeable membrane into a solution of lower solute concentration?

True
False

Question 13

Which best defines osmosis?

In osmosis, water from a solution of lower solute concentration move across a semi-permeable membrane into a solution of higher solute concentration?
In osmosis, water from a solution of higher solute concentration move across a semi-permeable membrane into a solution of lower solute concentration?

Question 14

Animal cells placed into a hypotonic solution would most likely?

lyse (burst)
shrink
remain unchanged in size

Question 15

Glucose and amino acids move into cells via carrier proteins, the same protein can move glucose or amino acids

True
False

Question 16

ATP powered pumps move substances into and out of cells by diffusion?

True
False

Question 17

For every 3 Na ions moved out, 2 K ions are moved into a cell by one cycle of the sodium-potassium pump.

True
False

Question 18

Bulk transport of fluid and any of the substances within that fluid is called

pinocytosis
phagocytosis
receptor-mediated endocytosis
exocytosis

TRUE OR FALSE? Correct the statement if it is false.

1.) A shallow concentration gradient limits the rate of facilitated diffusion

2.) Symport and antiport are coupled transport systems in which energy released by moving an ion from a region of high concentration to low concentration is used to move a solute against its concentration gradient

3.) Transport of siderophore-ion complexes into the cell requires the hydrolysis of PEP

4.) Both ABC transport and PTS transport are modular systems which ceoncentrate the substrate in the cell

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