Science Assessment ~ Items ~ RH035003

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A skin cell from a cow contains 60 DNA molecules. How many DNA molecules are found in new skin cells that develop as the cow grows?

30
60
90
120

Details
Performance
NGSS

Topic: Reproduction, Genes, and Heredity
Correct Answer: B

Distribution of Responses

Chart showing distrubtion of responses for Item RH035003

Students Responding Correctly

Group	Correct	Total	Percent
Overall	1060	2547	42%
Grades
6–8	490	1564	31%
9–12	569	980	58%
Gender
Male	503	1228	41%
Female	538	1276	42%
Primary Language
English	964	2250	43%
Other	70	225	31%

View data table

Disciplinary Core Ideas: LS1.B In multicellular organisms individual cells grow and then divide via a process called mitosis, thereby allowing the organism to grow. The organism begins as a single cell (fertilized egg) that divides successively to produce many cells, with each parent cell passing identical genetic material (two variants of each chromosome pair) to both daughter cells. Cellular division and differentiation produce and maintain a complex organism, composed of systems of tissues and organs that work together to meet the needs of the whole organism.