STAAR Practice

Each strand of a DNA molecule contains nitrogenous bases that pair with other nitrogenous bases in very specific ways. A diagram of a section of DNA is shown.

Which DNA strand is complementary to the one shown above?

• F

• G

• H

• J

How is information for a specific protein carried on the DNA molecule?

• As a sequence of nucleotides

• In the double-helix shape of the condensed chromosome

• In the ratio of adenines to thymines

• As a pattern of phosphates and sugars

Tags

6A

41 A student builds a model of a DNA strand.

Which of these models of a DNA strand shows bases that are complementary to the ones on the student’s DNA model?

• 
• 
• 
• 

Tags

6A

Which statement describes this model of DNA?

• The model is inaccurate because the base pairs are incorrect.

• The model is accurate because it contains correctly paired bases.

• The model is accurate because it shows each base splitting to form a double helix.

• The model is inaccurate because some typical bases in DNA are missing.

Tags

NGSS.HS-LS1-1

Which part of a DNA molecule is responsible for the direct coding of specific traits in an organism?

• The number of hydrogen bonds that hold the strands of DNA together.

• The number of carbons in the DNA molecule.

• The sequence of nucleotide bases in the DNA molecule.

• The sequences of phosphates along each DNA strand.

Tags

6A

Nucleotides are made up of a sugar, phosphate, and..?

• nitrogenous base

• nucleic acid

• cholesterol

• fatty acid

Tags

NGSS.HS-LS1-1

Which characteristics of PROTONS correctly complete the chart?

• Neutral/ Nucleus/ 1

• Positive/ Nucleus/ 1

• Negative/ Electron Cloud/ 0.0005

Tags

NGSS.MS-PS1-1

Which characteristics of NEUTRONS correctly complete the chart?

• Neutral/ Nucleus/ 1

• Positive/ Nucleus/ 1

• Negative/ Electron Cloud/ 0.0005

Tags

NGSS.MS-PS1-1

Center of the atom that contains protons and neutrons. Most of the mass of the atom with an overall positive charge.

• Electron Cloud

• Nucleus

• Isotope

• Elements

Tags

NGSS.MS-PS1-1

Outside the nucleus of the atom where electrons are found. Largest part of the atom, but least massive. Overall negative charge.

• Nucleus

• Elements

• Electron Cloud

• Protons

Tags

NGSS.MS-PS1-1