Question
3.24
In an experiment, you measure the concentration of a polar molecule inside and outside a cell. You find that the concentration is high and gradually increasing inside the cell. What is your best hypothesis for the process you are observing?
- a) facilitated diffusion
- b) passive transport
- c) simple diffusion
- d) active transport
- e) endocytosis
Question
3.25
Which of the following structures allow the passage of small molecules between animal cells?
- a) nucleoli
- b) tight junctions
- c) desmosomes
- d) gap junctions
- e) black holes
Question
3.26
The largest structure in a eukaryotic cell is the _____ and it is surrounded by ______ membrane(s).
- a) nucleus; one
- b) nucleus; two
- c) Golgi apparatus; one
- d) mitochondrion; two
- e) mitochondrion; one
Question
3.27
The cytoskeleton:
- a) is a viscous fluid found in all cells.
- b) fills a cell’s nucleus but not the other organelles.
- c) gives an animal cell shape and support, but cannot control movement.
- d) helps to coordinate intracellular movement of organelles and molecules.
- e) All of the above are correct.
Question
3.28
Which of the following statements about mitochondria is correct?
- a) Mitochondria are found in both eukaryotes and prokaryotes.
- b) There tend to be more mitochondria in fat cells than in liver cells.
- c) Most plant cells contain mitochondria.
- d) Mitochondria may have originated evolutionarily as photosynthetic bacteria.
- e) All of the above are correct.