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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 |
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 |