What crosses, and how
Before you read
Test yourself first: 5 questions
Question 1 of 5
A cell that has a true, membrane-bound nucleus is called:
Answer: B. Eukaryotic cells (plant, animal, fungi) contain a true nucleus enclosed by a membrane.
Question 2 of 5
A cell membrane that lets some substances in but not others is described as:
Answer: B. The cell membrane is selectively (semi-) permeable, controlling what enters and leaves.
Question 3 of 5
Active transport differs from diffusion because it:
Answer: A. Active transport moves substances against their concentration gradient and therefore requires cellular energy.
Question 4 of 5
The liquid connective tissue that transports cells and nutrients through the body is:
Answer: B. Blood is classified as a connective tissue; it transports cells, nutrients, gases, and wastes.
Question 5 of 5
The diffusion of water across a semipermeable membrane is called:
Answer: A. Osmosis is the passive movement of WATER from low to high solute concentration. Active transport moves solutes against a gradient and requires ATP.
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