AnswersBiologyIntroduction to Life

Introduction to Life — Test Answers

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22
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A scientist is examining the role of an element found in fats and carbohydrates of living things. This element makes up 65 percent of human body mass. Which statement describes the element he is studying?

A
He is studying nitrogen, which is the most abundant element in the atmosphere.
B
He is studying nitrogen, which can also be found in proteins.
C
He is studying oxygen, which is the most abundant element in the atmosphere.
D
He is studying oxygen, which can also be found in proteins.
23
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Is the student correct?

A
Yes, a hydrocarbon is any compound that contains hydrogen and oxygen.
B
Yes, a hydrocarbon is any compound that contains a carbon backbone.
C
No, a hydrocarbon contains at least one double or triple bond.
D
No, a hydrocarbon contains only carbon and hydrogen atoms.
24

What can you conclude from the graph?

A
The reaction that causes a firework to explode requires more energy to start, and occurs less rapidly than the reaction that causes a candle to burn.
B
The reaction that causes a firework to explode requires less energy to start, and occurs less rapidly than the reaction that causes a candle to burn.
C
The reaction that causes a firework to explode requires less energy to start, and occurs more rapidly than the reaction that causes a candle to burn.
D
The reaction that causes a firework to explode requires more energy to start, and occurs more rapidly than the reaction that causes a candle to burn.
25

Organisms contain different levels of organization within their bodies. Arachnoidiscus ehrenbergi , pictured, is a single-celled organism that is part of the group of algae known as diatoms. Which level of organization is seen in both Arachnoidiscus ehrenbergi and the human stomach?

A
organ
B
cell
C
organ system
D
tissue

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Introduction to Life — Test Answers — Biology