SOL Unit 1 Review - Sci Method and Graphs

The diagram shown represents the result of spinning a suspension of broken cells in an ultracentrifuge. Which is a correct conclusion?

• Ribosomes are more dense than mitochondria.

• Nuclei are more dense than mitochondria.

• Mitochondria and ribosomes are equal in density.

• The cell consists of only solid components.

The data shown are based on laboratory studies of male Drosophila showing the inherited bar-eye phenotype. Which is the best conclusion to be made from an analysis of these data?

• The optimum temperature for culturing Drosophila is 15°C.

• Drosophila cultured at 45°C will show a proportionate increase in the number of compound eye sections.

• Temperature determines eye shape in Drosophila.

• As temperature increases from 15°C to 30°C, the number of compound eye sections in male Drosophila with bar-eyes decreases.

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NGSS.MS-LS1-5

The graph shows the average growth rate for 38 pairs of newborn rats. One of each pair was injected with anterior pituitary extract. The other member of each pair served as a control.

At 75 days, what was the average weight of the rats injected with pituitary extract?

• 65 grams

• 125 grams

• 200 grams

• 225 grams

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NGSS.MS-LS1-5

The graph shows the average growth rate for 38 pairs of newborn rats. One of each pair was injected with anterior pituitary extract. The other member of each pair served as a control.

Based on the graph, it can be correctly concluded that the pituitary extract

• is essential for life

• determines when a rat will be born

• affects the growth of rats

• affects the growth of all animals

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NGSS.MS-LS1-5

A student reported that a wilted stalk of celery became crisp when placed in a container of ice water. The student then suggested that water entered the stalk and made it crisp. This suggestion is considered to be

• a control

• a hypothesis

• an observation

• a variable

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NGSS.MS-LS1-5

An experiment was designed to determine the effect of nitrates on plant growth. Two groups of plants were grown under identical conditions, except one group was watered with a dilute nitrate solution and the other group received water without nitrates. In this investigation, the group of plants grown without added nitrates is known as the

• abiotic factor

• control

• variable

• environmental stimulus

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NGSS.MS-LS2-1

A drug company tested a new medication before putting it on the commercial market. Pills without medication were given to 500 test subjects in group A and pills containing medication were given to 500 test subjects in group B. In this experiment, the individuals in group A served as the

• host

• variable

• control

• hypothesis

A student conducted an original, well-designed experiment, carefully following proper scientific procedure. In order for the conclusions to become generally accepted, the experiment must

• contain several experimental variables

• be repeated to verify the reliability of the data

• support the original hypothesis

• be conducted by a scientist

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NGSS.MS-LS1-5

Which observation best supports the inference that these frogs belong to the same species?

• A

• B

• C

• D

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NGSS.MS-LS4-4

A student is investigating the effect of different environmental factors on the growth of a certain species of bean plant over a period of 30 days. Which factor would not function as a variable in this investigation?

• species of bean plant

• soil moisture content

• amount of light

• atmospheric temperature

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NGSS.MS-LS1-5

NGSS.MS-LS2-1