random flashcards (all sciences)

Question 1

A embryonic human stem cell can develop into what?

Answer 1

any type of human cell

Question 2

A cell has circular DNA, is small and simple, and no nucleus or membrane bound organelles. What type of cell is this?

Answer 2

prokaryotic

Question 3

Describe four differences between a bacterial cell and a plant cell.

Answer 3

Bacterial cell is smaller than a plant cell.
Bacterial cell does not have chloroplasts.
Bacterial cell does not have its DNA inside a nucleus.
Bacterial cell does not have mitochondria.

Question 4

Describe a method to investigate how the temperature changes when different masses of ammonium nitrate are dissolved in water.

Answer 4

Use an insulated cup
Add water to the cup and measure the temperature with a thermometer
Add a specified mass of ammonium nitrate, eg. 1g
Stir to dissolve the solid
Measure the final temperature
Calculate the temperature difference
Repeat with different masses of ammonium nitrate, eg. 2g, 3g, 4g

Question 5

What is the main energy transfer for an apple falling from a tree?

Answer 5

mechanical

Question 6

how do you work out uncertainty

Answer 6

range/2