Bio 1500 Final Exam
1. Insect cells obtain the oxygen they need through diffusion of oxygen mole-
cules across the walls of narrow air-filled tubes called trachea. Oxygen diffuses
in both directions - it diffuses out of the cells and into the trachea, and it also
diffuses out of the trachea into the cells. However, more oxygen diffuses into
the cells than out of the cells. Given your understanding of diffusion, which one
of the following statements is most likely true?: There is a higher concentration of oxygen inside
the trachea than inside the cells.
2. Simple diffusion is very efficient for moving molecules around inside cells,
but it is inefficient for moving molecules from one part of the body, such as the
brain, to another part of the body, such as the heart. Why?: Since the time for diffusion
increases with the square of the distance the molecules need to move, diffusion is too slow to move molecules around
,the body.
3. According to scientific evidence, approximately how long ago did life first
arise on Earth?: 3.8 billion years ago
4. Which statement describes best the feeding habits of adult dragonflies?: Adult
dragonflies hunt other flying insects while they are flying themselves; they cannot feed while walking or sitting
5. How long did Dinosaurs roam on Earth ?: about 165 million years
6. Based on our exploration of Earth Viewer, which of the following statements
best describes the history of Earth through deep time?: The Earth is highly dynamic, with
large-scale changes in the amount of exposed land, the position of land masses, temperature, and concentrations of
gases in the atmosphere
7. According to scientific evidence, which of the following statements best de-
scribes the history of life on Earth?: Although life began relatively soon after the Earth cooled, most
of the major evolutionary events have occurred in the most recent 20% of the time since the Earth formed.
,8. According to hiring managers, what is a good way to prepare yourself for
getting a good job after college?: To develop team working skills and practice being an active learner.
9. If you add a drop of blue dye to water, the dye molecules will randomly move
from one area of higher concentration to an area of lower concentration until
equilibrium is reached.: equilibrium
10. Which of the following statements about dragonflies is FALSE?: Although they can
see, they mostly communicate with sound rather than sight.
, 11. A drop of dye has been deposited at one end of a tank of water. As expected,
the dye will slowly but surely distribute in the tank through diffusion.
You leave the tank of water alone for many hours and return to it later when
the water has an even color across the tank, i.e. the dye is evenly distributed
across the tank. Which statement best describes the behavior of individual dye
molecules at the time you return?: The individual dye molecules are still moving in the same manner
as when they were dropped into the tank
12. A drop of dye has been deposited at one end of a tank of water. In the figure
below, shaded circles represent molecules of dye and open circles represent
molecules of water.
In which direction is the molecule labeled "1" (on the left 'high concentration'
1. Insect cells obtain the oxygen they need through diffusion of oxygen mole-
cules across the walls of narrow air-filled tubes called trachea. Oxygen diffuses
in both directions - it diffuses out of the cells and into the trachea, and it also
diffuses out of the trachea into the cells. However, more oxygen diffuses into
the cells than out of the cells. Given your understanding of diffusion, which one
of the following statements is most likely true?: There is a higher concentration of oxygen inside
the trachea than inside the cells.
2. Simple diffusion is very efficient for moving molecules around inside cells,
but it is inefficient for moving molecules from one part of the body, such as the
brain, to another part of the body, such as the heart. Why?: Since the time for diffusion
increases with the square of the distance the molecules need to move, diffusion is too slow to move molecules around
,the body.
3. According to scientific evidence, approximately how long ago did life first
arise on Earth?: 3.8 billion years ago
4. Which statement describes best the feeding habits of adult dragonflies?: Adult
dragonflies hunt other flying insects while they are flying themselves; they cannot feed while walking or sitting
5. How long did Dinosaurs roam on Earth ?: about 165 million years
6. Based on our exploration of Earth Viewer, which of the following statements
best describes the history of Earth through deep time?: The Earth is highly dynamic, with
large-scale changes in the amount of exposed land, the position of land masses, temperature, and concentrations of
gases in the atmosphere
7. According to scientific evidence, which of the following statements best de-
scribes the history of life on Earth?: Although life began relatively soon after the Earth cooled, most
of the major evolutionary events have occurred in the most recent 20% of the time since the Earth formed.
,8. According to hiring managers, what is a good way to prepare yourself for
getting a good job after college?: To develop team working skills and practice being an active learner.
9. If you add a drop of blue dye to water, the dye molecules will randomly move
from one area of higher concentration to an area of lower concentration until
equilibrium is reached.: equilibrium
10. Which of the following statements about dragonflies is FALSE?: Although they can
see, they mostly communicate with sound rather than sight.
, 11. A drop of dye has been deposited at one end of a tank of water. As expected,
the dye will slowly but surely distribute in the tank through diffusion.
You leave the tank of water alone for many hours and return to it later when
the water has an even color across the tank, i.e. the dye is evenly distributed
across the tank. Which statement best describes the behavior of individual dye
molecules at the time you return?: The individual dye molecules are still moving in the same manner
as when they were dropped into the tank
12. A drop of dye has been deposited at one end of a tank of water. In the figure
below, shaded circles represent molecules of dye and open circles represent
molecules of water.
In which direction is the molecule labeled "1" (on the left 'high concentration'
