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Science > Biology - B1 > Flashcards

Biology - B1 Flashcards

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Biology 101 flashcards
1
Q

Osmosis and potato practical

A

Independent variable = concentration
Dependent variable = change in mass
Control variable = volume of solution, temperature, time and surface area of the potato
- the potato in the sugar solution will lose water and so will have less mass at the end; the potato in the pure water solution will gain water

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2
Q

What is a sperms function?

A
  • to get the male DNA to the female DNA
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3
Q

What is a nerves function?

A
  • to send electrical impulses around the body
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4
Q

What is a muscles function?

A
  • to contract quickly
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5
Q

What is a root hairs function?

A
  • to absorb water from the soil
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6
Q

What is the function of a phloem?

A
  • transports substances around the plant
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7
Q

What is the function of a xylem?

A
  • transports water through the plant
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8
Q

Equation for image size

A
  • image size = actual size x magnification
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9
Q

What is the adaptation of a sperm?

A
  • streamlined head, long tail, lots of mitochondria to provide energy
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10
Q

What is the adaptation of a nerve?

A
  • long to cover more distance

- has branched connections to connect in a network

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11
Q

What is the adaptation of the muscle?

A
  • long and contain lots of mitochondria for energy
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12
Q

What is the adaptation of a root hair?

A
  • a large surface area to absorb more water
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13
Q

What is the adaptation of a phloem?

A
  • pores to allow cell sap to flow

- cells are long and joined end to end

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14
Q

What is the adaptation of a xylem?

A
  • hollow in the centre

- tubes are joined end to end

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15
Q

What are the similarities of both animal cells and plant cells?

A
  • both have a nucleus
  • both have a cytoplasm
  • both have a cell membrane
  • both have a mitochondria
  • both have ribosomes
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16
Q

What things do plant cells have that animal cells don’t?

A
  • chloroplast, vacuole and a cell wall
17
Q

Describe a bacterial cell

A
  • bacteria cells do not have a true nucleus, they just have a single strand of DNA that floats in a cytoplasm
  • they also contain a plasmid
18
Q

Chromosomes and mitosis

A
  • in a nucleus of a human cell there are 23 pairs of chromosomes.

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