because the flavor molecules are moving, and some will end up moving into each part of the glass -
Correct Answers Suppose you put a drop of lime flavoring into a glass of water. When you drink the
water later, the flavor has spread throughout the water, rather than remaining in the spot where you
deposited it. Why?
- Correct Answers Think about the data analyzed in the Clapham and Karr paper: The comparison
between the two data sets (i.e. oxygen levels and dragonfly size) illustrates that:
Look at the formula t=x2/2D, which you learned about in the lecture on diffusion. Which of the following
is a valid conclusion that can be drawn from this formula?
A. Small increases in diffusion distance result in much bigger increases in the time required.
B. If you double the size of the diffusing molecules, you reduce the time of diffusion by half.
C. When you increase the temperature, the rate of diffusion slows down.
D. You can speed up the rate of diffusion by increasing the distance between molecules. - Correct
Answers A. Small increases in diffusion distance result in much bigger increases in the time required.
Given what you know about the size of Meganeura (the giant dragonflies), what is the minimum number
of meganeura wingspans that should be between you and your friend for sufficient social distancing
during a Covid-19 pandemic?
A. 2 Meganeuras
B. 0.5 Meganeuras
C. 1 Meganeura
,D. 10 Meganeuras - Correct Answers A. 2 Meganeuras
The atmosphere of the early Earth did not contain O2. Where did the O2 eventually come from?
A. The O2 came from the Earth's crust as a result of spreading of the seafloor.
B. Photosynthetic organisms released the O2.
C. The O2 came from the decomposition of dragonflies during the Carboniferous.
D. Chemical reactions cause the O2 to be released from minerals. - Correct Answers B. Photosynthetic
organisms released the O2.
For how long did Dinosaurs roam on Earth?
A. about 100 thousand years
B. less that 40 million years
C. about 165 million years
D. about 2 billion years
E. about 300 million years - Correct Answers C. about 165 million years
How do blue light and microwave radiation differ from each other?
A) They differ in temperature
,B) One is potential energy and the other is kinetic energy
C) They are made out of fundamentally different things
D) They're the same thing - microwave ovens cook your food with blue light
E) They have different wavelengths - Correct Answers E) They have different wavelengths
According to scientific evidence, approximately how long ago did Earth form?
A) 4.6 million years ago
B) 900 million years ago
C) 1.2 million years ago
D) 4.6 billion years ago
E) 13.7 billion years ago - Correct Answers D) 4.6 billion years ago
What does it mean if a channel in a cell membrane is selective?
A) the channel allows only certain substances to pass through, but not others
B) sometimes the channel allows molecules to pass through, and sometimes it doesn't
C) the channel allows molecules to enter a cell, but not to leave the cell
, D) the channel moves to different areas of the membrane, depending on where the need for diffusion is
greatest - Correct Answers A) the channel allows only certain substances to pass through, but not
others
Which of the following statements best describes the role of birds in influencing dragonfly size?
A) Once birds evolved, dragonflies were limited to smaller sizes, because small dragonflies are harder for
birds to catch.
B) Birds forced dragonflies to evolve to a larger size because bigger dragonflies provide more food for
birds than do small dragonflies.
C) Since birds and dragonflies feed on the same prey items, once birds evolved, the competition for food
drove dragonflies to evolve a smaller size. - Correct Answers A) Once birds evolved, dragonflies were
limited to smaller sizes, because small dragonflies are harder for birds to catch.
How does facilitated transport differ from diffusion?
A) In facilitated transport, the cell uses energy to move the substance across a membrane.
B) In facilitated transport, the substance passes through a pore, or tunnel, inside other molecules in the
membrane.
C) In facilitated transport, substances always move against their concentration gradient, i.e. toward
areas of higher concentration.
D) In facilitated transport, molecules are sucked into the cell by rotational currents in the cytoplasm that
help to pull materials across the membrane. - Correct Answers B) In facilitated transport, the substance
passes through a pore, or tunnel, inside other molecules in the membrane.
According to hiring managers of large companies, what is the most important characteristic of college
graduates that they are considering hiring?
A) They have a large amount of job-related content knowledge.
B) They are able to work long hours by themselves.
Correct Answers Suppose you put a drop of lime flavoring into a glass of water. When you drink the
water later, the flavor has spread throughout the water, rather than remaining in the spot where you
deposited it. Why?
- Correct Answers Think about the data analyzed in the Clapham and Karr paper: The comparison
between the two data sets (i.e. oxygen levels and dragonfly size) illustrates that:
Look at the formula t=x2/2D, which you learned about in the lecture on diffusion. Which of the following
is a valid conclusion that can be drawn from this formula?
A. Small increases in diffusion distance result in much bigger increases in the time required.
B. If you double the size of the diffusing molecules, you reduce the time of diffusion by half.
C. When you increase the temperature, the rate of diffusion slows down.
D. You can speed up the rate of diffusion by increasing the distance between molecules. - Correct
Answers A. Small increases in diffusion distance result in much bigger increases in the time required.
Given what you know about the size of Meganeura (the giant dragonflies), what is the minimum number
of meganeura wingspans that should be between you and your friend for sufficient social distancing
during a Covid-19 pandemic?
A. 2 Meganeuras
B. 0.5 Meganeuras
C. 1 Meganeura
,D. 10 Meganeuras - Correct Answers A. 2 Meganeuras
The atmosphere of the early Earth did not contain O2. Where did the O2 eventually come from?
A. The O2 came from the Earth's crust as a result of spreading of the seafloor.
B. Photosynthetic organisms released the O2.
C. The O2 came from the decomposition of dragonflies during the Carboniferous.
D. Chemical reactions cause the O2 to be released from minerals. - Correct Answers B. Photosynthetic
organisms released the O2.
For how long did Dinosaurs roam on Earth?
A. about 100 thousand years
B. less that 40 million years
C. about 165 million years
D. about 2 billion years
E. about 300 million years - Correct Answers C. about 165 million years
How do blue light and microwave radiation differ from each other?
A) They differ in temperature
,B) One is potential energy and the other is kinetic energy
C) They are made out of fundamentally different things
D) They're the same thing - microwave ovens cook your food with blue light
E) They have different wavelengths - Correct Answers E) They have different wavelengths
According to scientific evidence, approximately how long ago did Earth form?
A) 4.6 million years ago
B) 900 million years ago
C) 1.2 million years ago
D) 4.6 billion years ago
E) 13.7 billion years ago - Correct Answers D) 4.6 billion years ago
What does it mean if a channel in a cell membrane is selective?
A) the channel allows only certain substances to pass through, but not others
B) sometimes the channel allows molecules to pass through, and sometimes it doesn't
C) the channel allows molecules to enter a cell, but not to leave the cell
, D) the channel moves to different areas of the membrane, depending on where the need for diffusion is
greatest - Correct Answers A) the channel allows only certain substances to pass through, but not
others
Which of the following statements best describes the role of birds in influencing dragonfly size?
A) Once birds evolved, dragonflies were limited to smaller sizes, because small dragonflies are harder for
birds to catch.
B) Birds forced dragonflies to evolve to a larger size because bigger dragonflies provide more food for
birds than do small dragonflies.
C) Since birds and dragonflies feed on the same prey items, once birds evolved, the competition for food
drove dragonflies to evolve a smaller size. - Correct Answers A) Once birds evolved, dragonflies were
limited to smaller sizes, because small dragonflies are harder for birds to catch.
How does facilitated transport differ from diffusion?
A) In facilitated transport, the cell uses energy to move the substance across a membrane.
B) In facilitated transport, the substance passes through a pore, or tunnel, inside other molecules in the
membrane.
C) In facilitated transport, substances always move against their concentration gradient, i.e. toward
areas of higher concentration.
D) In facilitated transport, molecules are sucked into the cell by rotational currents in the cytoplasm that
help to pull materials across the membrane. - Correct Answers B) In facilitated transport, the substance
passes through a pore, or tunnel, inside other molecules in the membrane.
According to hiring managers of large companies, what is the most important characteristic of college
graduates that they are considering hiring?
A) They have a large amount of job-related content knowledge.
B) They are able to work long hours by themselves.
