2021-2022 IB Biology Final Review

What structures are part of an E. coli cell?

• Ribosomes, nucleoid and Golgi apparatus

• Ribosomes, mitochondria and pili

• Cell wall, plasma membrane and nuclear membrane

• Pili, flagella and cytoplasm

What is the reason for antibiotics not damaging human cells?

• The dose is too small to be harmful.

• The dose is taken for only a short time.

• Antibiotics occur naturally in humans.

• Human metabolism is different from bacterial metabolism.

Which feature of both striated muscle and aseptate fungal hyphae is different from typical cell structure?

• They have plasmids.

• They have multiple nuclei within a structural unit

• They have a cell wall that is not made of cellulose

• They have an absence of cholesterol in the plasma membrane

Which function is accomplished by structures X and Y in the Paramecium?

• Excretion and digestion

• Homeostasis and feeding

• Movement and food storage

• Respiration and DNA replication

The following electron micrograph shows part of a palisade mesophyll cell. Which of the labelled structures controls the exchange of substances to and from the cell?

• structure A

• structure B

• structure C

• structure D

What biomolecule is the Rough ER most likely to produce?

• Nucleic acid

• Lipids

• Carbohydrates

• Proteins

Which stem cell possess the greatest differential potential?

• Totipotent

• Pluripotent

• Multipotent

• Unipotent

If cells of a multicellular organism have the same genes, how can there be many different cell types in a body?

• Some genes but not others are expressed in each cell type.

• Cells lose some genes as development occurs.

• Genes do not determine the structure of a cell.

• Cells must practice division of labor in order to survive.

What is the name of the organelle in the micrograph below?

• Mitochondrion

• Chloroplast

• Golgi apparatus

• Rough endoplasmic reticulum

A tissue sample was examined under the microscope in order to determine a mitotic index. The number of cells in each stage of the cell cycle was determined and the data were entered into a table. What is the mitotic index?

• 0.125

• 0.25

• 0.75

• 1.00