Do-Now Define osmosis.

Do-Now Define osmosis. Today’s Schedule Do-Now Robot Review Homework Review all classwork and textbook pages on chemicals in cell.

Robot Review: Genetics

Question: • Explain why you know the genotype of a person with blue eyes, but not the genotype of someone with brown eyes.

ROBOTS – Power Down!

Answer: The person with blue eyes must have two copies of the recessive allele. The person with brown eyes can be homozygous or heterozygous.

Question: Explain why two white mice cannot have a black baby.

Answer: • Diffusion- molecules are moving from high to low concentration.

Question: • Two reasons that osmosis is different from regular diffusion.

Answer: • It is the diffusion of water molecules only, and it must be across a membrane.

Question: • What happens to an egg with no shell when placed in water (name the transport process and state how the mass of the egg changes)

Answer: • Water moves into the egg by osmosis, making the egg gain mass.

Question: • When an egg with no shell is placed in corn syrup, why don’t the sugar molecules move into the egg?

Answer: • They are too big to fit through the holes in the membrane.

Question: • Two reasons why active transport is like riding your bike up a hill.

Answer: • It requires energy and moves something from high to low concentration.

Question: • What will happen to the cells of a freshwater fish if placed in saltwater?

Answer: • Water will move out of the cells by osmosis and the cells will shrivel up.

Question: • What transport process is shown here (explain how you know)?

Answer: • Active transport- molecules move from low to high concentration, and ATP is used.

Question: • What does “selectively permeable” mean?

Answer: • Letting some things pass through but not others.

Question: • What happens to an egg with no shell placed in corn syrup, and why?

Answer: It loses mass because water moves out by osmosis. The egg has a higher concentration of water than the corn syrup.

Question: • There are two main types of active transport: engulfing and: ___________? (name the process and tell what it means)

Answer: • Transport proteins- they are proteins in the membrane that carry molecules from low to high concentration.

Question: • What type of water concentration does the solution in this picture (the stuff around the cell) have? How do you know?

Answer: • A lower concentration because water moves out of the cell.

Question: • Organic molecules contain this element.

Answer: • Carbon

Question: • Glucose and starch are examples of this type of compound.

Answer: • Carbohydrate

Question: • The two types of nucleic acids

Answer: • DNA and RNA

Question: • This type of molecule is used for long-term energy storage.

Answer: • Lipid

Do-Now Define osmosis.