biology exam

which organelles is/are never found in animals cells

• cell wall

• cell membrane

• vacuole

• mitochondria

Which organelle assembles proteins.

• ER

• golgi

• ribosome

• nucleus

organelle responsible for transporting proteins within the cell

• ER

• nucleus

• ribosome

• golgi

A cell has organelles that carry out the following functions respectively: controls the entry and exit of materials, provides energy, contains genetic material and carries out photosynthesis

• Mitochondria, nucleus, cell membrane, chloroplast.

• Cell membrane, chloroplast, mitochondria, nucleus.

• Cell membrane, mitochondria, nucleus, chloroplast

plant cells can be distinguished from animal cells because only plant cells possess

• cell walls and central vacuoles

• cell wall and mitochondria

• chromosomes and mitochondria

• golgi bodies and central vacuoles

why do cells contain different enzymes

• enzymes are temp specific

• enzymes are specific in their action

• enzymes are sensitive to pH changes

• Enzymes are sensitive to substrate concentration

Enzymes don't function beyond 70c because

• the protein in the enzyme changes shape at that temperature

• there is too little substrate at that temp

• the amount of product increases at a higher temp

• the pH isnt favourable

Enzymes are essential for biochemical reaction because

• all work best at temps over 50c

• are used up in chemical reactions

• are not sensitive to pH changes

• lower the amount of activation energy required

product (output) of breakdown of glucose by animal cells in the absence of oxygen during respiration

• lactic acid

• ethanol

• water

• acetic acid

most important product (output) of respiration for cells to use for energy

• CO2

• glucose

• ATP

• ADP