Structure and organisation Flashcards

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1
Q

What is an organ?

A

A group of tissues that work together to do a particular job

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2
Q

What is an organelle?

A

A specialised structure within a cell

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3
Q

What is a cell?

A

A basic structural and functional unit of a living organism

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4
Q

What is a tissue?

A

A group of cells with a similar structure working together

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5
Q

What is an organ system?

A

A group of organs with similar functions working together

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6
Q

What is a nucleus?

A

Controls the cell activity and contains chromosomes.

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7
Q

Describe the rest for glucose

A
  1. Add benedict’s solution
  2. Place in boiling bath
  3. If glucose is present, orange-red precipitate forms.
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8
Q

What is the test for starch?

A
  1. Add iodine solution

2. If turns blue-black, starch is present

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9
Q

What are the characteristics of an enzyme?

A
  1. Biological catalysts
  2. Not used up in reaction
  3. Reaction specific
  4. Made of protein
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10
Q

What happens with enzymes?

A
  1. Substrate enters enzyme’s active site
  2. Forms enzyme-substrate complex
  3. Reaction happens and product leaves active site
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11
Q

How does temperature affect enzymes?

A
  1. As it increases, reaction rate increases
  2. Optimum temp is where the most reactions occur
  3. If too hot proteins break down and enzymes become denatured
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12
Q

What is the ph effect on enzymes?

A
  1. There is an optimum ph
  2. Ph affects shape of the active site.
  3. At extremes the enzyme is denatured.
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13
Q

What are the differences between animal and plant cells?

A
  1. Animal cells don’t have a cell wall
  2. There is no vacuole in an animal cell
  3. Plant cells have chloroplasts
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