Traits Of Living Things

1. Which instrument do scientists use to observe DNA?

Barometer

Hand lens

Microscope

Thermometer

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3. Kevin observes a frog. Which statement is NOT an observation?

Its skin is smooth.

It will live at least 15 years.

Its long legs help it jump far.

Its webbed feet help it swim.

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5. The order of the nitrogen bases in a DNA molecule determines an organism's

Centromeres.

Chromatids.

Genes.

Phophates

6. A change in DNA during replication is

A hybrid.

A mutation.

A nucleotide.

Reproduction.

7. A brown rabbit has one gene for brown coloring (G) and one gene for white coloring (g). A white rabbit has two genes for white coloring (g). What are the possible gene combinations of their off spring?

GG and gg

GG and Gg

Gg and gg

GG and Gg or gg

8. Which would be the BEST model of a DNA molecule?

Stacks of wooden blocks

A zipper that is slightly twisted

Different sizes and colors of marbles

A stretched metal spring toy

9. Body shape, haor and eye color, and the need for sleep are examples of manipulated traits.

True

False

10. In a classroom, 7 students have attached earlobes, and 21 have detached earlobes. What fraction of students in the classroom have attached earlobes?

1/7

1/5

1/4

1/3