Bio 1500 test new questions
1. A friend states, 'The atmosphere of Earth is so vast. I don't believe that
anything humans are doing could have a meaningful impact on the make-up
of the atmosphere - climate change must be caused by something else.' Which
of the following is the most appropriate response?
a. Dinosaurs were responsible for large fluctuations in oxygen levels in previous
geological eras; now that dinosaurs are extinct, though, the atmosphere is
unlikely to change again.
b. Living organisms have caused extraordinary changes in the Earth's atmos-
phere in the past, so it's not unreasonable to think that humans could have an
influence too.
,c. Since gases diffuse to equilibrium, the concentration of oxygen and carbon
dioxide in the atmosphere has remained the same since the Earth formed.
d. We know from Earth Viewer that volcanic eruptions and meteor impacts are
the only things that have caused changes in past climates.: b
2. The early atmosphere on Earth contained only trace amounts of O2, which
now makes up about 20% of the air we breathe. Where did the O2 in the
atmosphere come from?
a. it seeped out of the Earth's core as the planet cooled
b. it accumulated due to the spontaneous decay of water molecules
c. it formed as the ozone layer broke down
d. it was released by photosynthetic organisms
,e. it was exhaled by dinosaurs: d
3. 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?
a. The oxygen molecules want to leave the trachea and enter the cells, so that
they can be of use to the insect.
b. Insects need to use a lot of energy to move sufficient oxygen into their cells.
c. Once an oxygen molecule enters a cell, it will never move back into the
, trachea.
d. There is a higher concentration of oxygen inside the trachea than inside the
cells.: d
4. when were the first dinosaurs?: 230 million years ago
5. when was first life on earth?: 3.6 billion years ago
6. when was the first cyanobacteria present?: 2.5 billion years ago
7. when were the first animals?: 590 million years ago
8. when were modern humans?: 200,000 years ago
9. when was the start of the carboniferous?: 360 million years ago
10. Which of the following statements about dragonflies is FALSE?
a. They are predators as larvae AND as adults
1. A friend states, 'The atmosphere of Earth is so vast. I don't believe that
anything humans are doing could have a meaningful impact on the make-up
of the atmosphere - climate change must be caused by something else.' Which
of the following is the most appropriate response?
a. Dinosaurs were responsible for large fluctuations in oxygen levels in previous
geological eras; now that dinosaurs are extinct, though, the atmosphere is
unlikely to change again.
b. Living organisms have caused extraordinary changes in the Earth's atmos-
phere in the past, so it's not unreasonable to think that humans could have an
influence too.
,c. Since gases diffuse to equilibrium, the concentration of oxygen and carbon
dioxide in the atmosphere has remained the same since the Earth formed.
d. We know from Earth Viewer that volcanic eruptions and meteor impacts are
the only things that have caused changes in past climates.: b
2. The early atmosphere on Earth contained only trace amounts of O2, which
now makes up about 20% of the air we breathe. Where did the O2 in the
atmosphere come from?
a. it seeped out of the Earth's core as the planet cooled
b. it accumulated due to the spontaneous decay of water molecules
c. it formed as the ozone layer broke down
d. it was released by photosynthetic organisms
,e. it was exhaled by dinosaurs: d
3. 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?
a. The oxygen molecules want to leave the trachea and enter the cells, so that
they can be of use to the insect.
b. Insects need to use a lot of energy to move sufficient oxygen into their cells.
c. Once an oxygen molecule enters a cell, it will never move back into the
, trachea.
d. There is a higher concentration of oxygen inside the trachea than inside the
cells.: d
4. when were the first dinosaurs?: 230 million years ago
5. when was first life on earth?: 3.6 billion years ago
6. when was the first cyanobacteria present?: 2.5 billion years ago
7. when were the first animals?: 590 million years ago
8. when were modern humans?: 200,000 years ago
9. when was the start of the carboniferous?: 360 million years ago
10. Which of the following statements about dragonflies is FALSE?
a. They are predators as larvae AND as adults
