Author: Joyce Buda


Themes Quiz
Question 1
Points: 10 out of 10
An organism or cell exhibits ____________ when it maintains steady internal conditions despite changes in the outer environment.
natural selection
Question 2
Points: 10 out of 10
Why do organisms maintain fairly steady conditions within their cells and bodies?
Organisms just change along with whatever is happening in the outside world, which is usually quite steady.
They must maintain stable conditions to keep their enzymes working and generally to enable the chemical reactions of life.
They need to keep conditions stable so that they can obtain food.
Unstable conditions will destroy the DNA in cells; this is the most important risk for a cell facing physical or chemical stress.
Correct. This is the main issue: cells and bodies are host to many chemical reactions that work best in a narrow range of conditions.
Question 3
Points: 10 out of 10
One organism gets larger as it passes through its life cycle. This is an example of __________.
Correct Growth happens when an organism gets bigger.
Question 4
Points: 10 out of 10
Which best expresses how nutrients and energy move through life?
Nutrients flow from sunlight to organic matter to heat. Energy cycles among all life forms.
Nutrients and energy both are continually recycled in a great circle of life.
Nutrients cycle among all life forms. Energy flows from sunlight to chemical energy to heat.
Correct. Nutrients are recycled, but energy flows through.
Question 5
Points: 10 out of 10
Which of the following is not a recurring theme in biology?
Living organisms maintain homeostasis.
Energy flows through living systems while matter is recycled.
Evolutionary processes explain both the unity and adaptive diversity of life.
All of these are recurring themes.
Correct. These are 3 of the themes that we will see throughout this course.
Question 6
Points: 10 out of 10
Imagine you have a peanut butter sandwich in front of you. The sandwich is an example of _______.
Yes. A peanut butter sandwich has mass and takes up space, so it is matter.
Question 7
Points: 10 out of 10
You provide your gut bacteria with a warm place to live. They provide you with vitamins and other services. This most directly represents an example of...
natural selection
shared ancestry of all life
interdependence of life
Yes, this is a good example of interdependence. It involves the other processes to some degree, but here the focus is on mutual dependence of the two life forms.
Question 8
Points: 10 out of 10
The ability or tendency of organisms and cells to maintain stable internal conditions is called
emergent property
Correct. Homeostasis is the ability to maintain a stable internal environment.
Question 9
Points: 10 out of 10
Select the statements that correctly represent the theory of evolution. Select all that apply.
Evolution is partly about inheritance. Evidence of evolution is seen in structures such as wisdom teeth and the tail bone in humans. These structures are thought to be “left over” from our ancestors and no longer appear to have any essential function in modern humans.
Natural selection means that today’s organisms are perfectly adapted after millions of years of fine-tuning. No further changes are necessary because of all the progress that has been made by natural selection.
We can see evidence of past natural selection in adaptations such as the camouflage of moths perched on the bark of their host tree. We can also see natural selection at work today if we track how populations change in rapidly changing environments.
The theory of evolution does not apply to life today. It is strictly about the history of life: what happened in the past as seen in fossils.
Scientists disagree about the main ideas of evolutionary theory because of incomplete or conflicting evidence.
Correct! Shared ancestry, or relatedness, is a major theme of evolution. And, the examples presented emphasize natural selection as a flexible process that improves the “fit” between populations and their environments.
Question 10
Points: 10 out of 10
Which type of molecule best illustrates the very strong relationship between structure and function in biology?
oxygen gas
all kinds of organic matter
Yes. The structure of enzymes is exquisitely matched to their function.

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