Chemistry Flashcards
What are the two features of diffusion that do not apply to active transport?
- Movement occurs from a region of higher concentration to lower concentration
- No energy is required
What is defined as the chemical reactions that break down food molecules in cells to release energy?
D respiration
What life process is exemplified by living animals releasing carbon dioxide?
A excretion
Which cell structure is from the shaded area that represents structures found in both plant and animal cells?
A cell membrane
Which cell has a nucleus, palisade cell or nerve cell?
Both have a nucleus
Which two cells contain cellulose and a vacuole?
B 1 and 4
What is the actual diameter of a cell that has been magnified 3000 times and is represented as 21mm wide?
B 21/3000 mm
Which process describes the movement of oxygen and carbon dioxide between body cells and the blood in capillaries?
A diffusion
In which tubes will osmosis take place according to the experiment diagram?
B 1 and 4
What is an example of osmosis?
D Water enters a plant root from the soil
What is the movement of particles from a region of lower concentration to a region of higher concentration using energy from respiration?
B active transport
What happens during osmosis according to the membrane diagram?
C More water molecules pass through the membrane from X to Y than from Y to X
What is the concentration of sugar in solution X if more sugar diffuses out of the bag than diffuses in?
A 10%
What distinguishes plant cells from animal cells under a light microscope?
- Cell wall
- Chloroplasts
Name one animal cell and one plant cell that has no nucleus when fully developed.
Animal cell: Mature blood cell. Plant cell: Mature xylem vessel.
What is the function of a mature blood cell?
It carries more oxygen and hemoglobin
What is the function of a mature xylem vessel?
To allow water to flow through easily
Explain why the students calculated the percentage change in mass of the onions.
To determine the effect of sodium chloride concentration on the mass of the onions
True or False: Active transport requires energy.
True
Fill in the blank: Active transport is the movement of molecules from a region of _______ concentration to a region of higher concentration.
[lower]
How are roots adapted to absorb ions?
Roots have a large surface area and are equipped with transport proteins for ion absorption
