Question 1

Which of the following best describes the role of the independent variable in a scientific experiment, as shown in the spider web study?

Accepted Answer

It is the variable that is deliberately changed or manipulated by the experimenter.

Question 2

In the context of graphing experimental data, which type of graph is most appropriate for visualizing the relationship between two continuous variables?

Accepted Answer

Line graph

Question 3

A scientist is studying the effect of temperature on the rate of enzyme activity. Which variable should be placed on the x-axis of the graph?

Accepted Answer

Temperature

Question 4

Which of the following conclusions is best supported if an experiment shows that spider webs with more writing trap more insects?

Accepted Answer

Increased writing in spider webs increases the number of insects trapped.

Question 5

Which of the following is NOT a component of a DNA nucleotide?

Accepted Answer

Ribose sugar

Question 6

If a DNA sample contains 14% thymine, what percentage of the sample is guanine?

Accepted Answer

$$36\%$$

Question 7

Which of the following best explains why DNA is considered a good molecule for storing genetic information?

Accepted Answer

It can store information for long periods and can be accurately replicated.

Question 8

Which base pairing is correct according to the rules of DNA structure?

Accepted Answer

Adenine pairs with thymine

Question 9

What type of bond holds together the sugar and phosphate groups in the DNA backbone?

Accepted Answer

Phosphodiester bond

Question 10

A student is asked to graph the number of insects caught in spider webs with different amounts of writing. The data for 'amount of writing' is categorical (e.g., 'none', 'some', 'a lot'). Which graph type is most appropriate?

Accepted Answer

Bar graph

Question 11

Which of the following statements about the structure of DNA is correct?

Accepted Answer

The two strands are antiparallel and the bases are on the inside.

Question 12

Which of the following best describes a null hypothesis in a scientific experiment?

Accepted Answer

A statement that there is no effect or difference.

Question 13

Which of the following is a pyrimidine base found in DNA?

Accepted Answer

Thymine

Question 14

A researcher collects data on the number of hours spider webs remain intact with different levels of added writing. Which variable is the dependent variable?

Accepted Answer

Time web remains intact

Question 15

Which of the following best explains why a box and whisker plot might be used in analyzing experimental data?

Accepted Answer

To display the mean and variability of a dataset.

Question 16

If a DNA molecule is composed of 23% adenine, what percentage of the molecule is cytosine?

Accepted Answer

$$27\%$$

Question 17

Which of the following is a correct statement about the directionality of DNA strands?

Accepted Answer

One strand runs 5' to 3', the other runs 3' to 5'.

Question 18

Which of the following best describes the difference between a hypothesis and a theory in science?

Accepted Answer

A hypothesis is a testable prediction, while a theory is a well-supported explanation.

Question 19

Which of the following best explains why hydrogen bonds are important in the structure of DNA?

Accepted Answer

They allow the two DNA strands to separate during replication.

Question 20

A scientist wants to show the proportion of each nucleotide base in a DNA sample. Which type of graph would be most appropriate?

Accepted Answer

Pie chart

Scientific Inquiry, Data Analysis, and the Structure of DNA

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