IB Biology 1.4

The diagram shows a section through a membrane. What are the modes of transport in the diagram?

• A

• B

• C

• D

Which graph best represents the relationship between the concentration of chloride ions in the external environment of a cell and the rate at which the chloride ions move by facilitated diffusion into the cytoplasm of the cell?

• A

• B

• C

• D

The diagrams represent cells with the same concentration of dissolved substances in their cytoplasm. If all the cells were placed in the same hypertonic sucrose solution, which cell would show the greatest rate of change in the concentration of its cytoplasm?

• A

• B

• C

• D

Tags

NGSS.HS-LS1-3

A human organ is being prepared for transplant. In what type of solution must it be bathed?

• A. A hypertonic solution

• B. A hypotonic solution

• C. Pure water containing no solutes

• D. A solution with the same osmolarity as the organ tissue

Tags

NGSS.HS-LS1-3

Dialysis membrane was set up to model digestion and absorption in the small intestine.

What is a limitation of this model?

• A. There can be no active transport.

• B. Maltose will pass through the membrane.

• C. Lipase should be present with protein.

• D. The membrane is not permeable to starch.

The salt concentration inside an animal cell is 1.8 %. The salt concentration in the surrounding medium becomes 5 %. What will be the likely response?

• A. The cell will gain water from the medium.

• B. The cell will lose salt to the medium.

• C. The cell will remain unchanged.

• D. The cell will shrink from loss of water.

Tags

NGSS.HS-LS1-3

The bacterium Neisseria gonorrhoeae causes infections related to the human reproductive system. The graph shows the percentage of samples in which this bacterium showed resistance to six antibiotics over a period of ten years.

What is a possible explanation for the total percentage resistance being larger than 100% in 2010?

• A. People do not take the antibiotics as prescribed.

• B. More people have been sampled in that year.

• C. There was an epidemic of Neisseria gonorrhoeae in that year.

• D. Some bacteria are resistant to more than one antibiotic.

Cladograms can be created by comparing DNA or protein sequences. The cladogram on the left is based on DNA sequences and the cladogram on the right is based on comparing protein sequences.

What is the reason that cladograms based on DNA sequences are more reliable predictors of the phylogenetic relationship of species than cladograms based on protein sequences?

• A. Amino acids are not as chemically stable as DNA nucleotides.

• B. DNA mutates but amino acids do not.

• C. Several different triplets of bases can code for the same amino acid.

• D. There are 20 different amino acids but only 4 nucleotides.

Tags

NGSS.HS-LS4-1

What is osmosis?

• A. The movement of water through a membrane from a low to a high solute concentration

• B. The movement of solutes through a membrane from a high to a low water concentration

• C. The movement of water through a membrane from a high to a low solute concentration

• D. The movement of solutes through a membrane from a low to a high water concentration

Which movement occurs by osmosis?

• A. Oxygen from alveoli into the blood

• B. Water from a leaf into the atmosphere

• C. Water from soil to root

• D. Nitrate ions from soil to root

Tags

NGSS.MS-LS1-2