Unit 1 Biology Revision #1

Quiz
•
Biology
•
11th Grade
•
Hard
Isabella Bundesen
Used 8+ times
FREE Resource
15 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Cells with larger SA:V ratios are more likely to survive because they have:
a high metabolic rate
A low metabolic rate
a low rate of material exchange
a high rate of material exchange
Answer explanation
Due to having a high surface area to volume ratio, the cell is able to exchange material with its external environment at a faster rate. This allows it to gain the materials it needs for the creation of energy to survive and get rid of the cell waste in an efficient manner.
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which of these is true for active transport?
It requires a cell to expend energy
It moves molecules down their concentration gradient
It is exclusively the movement of lipophilic substances
It requires no expenditure of ATP
Answer explanation
Active transport is the movement of substances against their concentration gradient, which requires energy. An example of active transport is the sodium-potassium pumps in nerve cells.
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Molecules which use protein channels to cross the membrane tend to be
Small & Non-polar
Large & Polar
Urea
Lipophilic & hydrophobic
Answer explanation
Polar, hydrophilic molecules generally have difficulty crossing the plasma membrane through simple diffusion, as they are repelled by the fatty-acid tails of the phospholipids.
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which of the following is true of a spherical cell
Cell surface area increases faster than cell volume
Cell volume decreases with increasing cell surface area
Cell volume increases faster than cell surface area
Cell surface area decreases with increasing cell volume
Answer explanation
The cell volume of a spherical cell increases faster than its surface area.
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which of these options describes the properties of a phospholipid head?
Polar & hydrophilic
Polar & hydrophobic
Non-polar & hydrophilic
Non-polar & hydrophobic
Answer explanation
Something that is polar is also hydrophilic ("water-loving") and lipophobic (lipid-fearing").
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A cell which has no regular shape would most likely be a
animal cell
plant cell
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which of the following is true of plant cells being place in a hypotonic solution
The cell contents move away from the cell
Water enters the cell through osmosis until lysis occurs
Turgor pressure increases until no water enters the cell
Water leaves the cell through osmosis resulting in the cell membrane to shrink
Answer explanation
Hypotonic solutions mean that the external concentration of water is higher than the internal (cell) concentration of water. Hence, water goes down the concentration gradient into the cell generating a turgor pressure, with the cell contents pushing against the cell wall until water can no longer enter the cell.
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