STAAR Category 2

The net force on a vehicle that is accelerating at a rate of 1.5 m/s2 is 1,800 newtons. What is the mass of the vehicle to the nearest kilogram?

Tags

NGSS.MS-PS2-2

A large rock is motionless on a flat sidewalk. Which statement best explains why the rock remains motionless?

• There are no forces acting on the rock.

• The only force acting on the rock is directed toward the sidewalk.

• The forces acting on the rock are all balanced.

• The sidewalk exerts an unbalanced force on the rock.

The distance a toy car travels over time is shown in the graph.

Which table best shows the average speed of the toy car at different time intervals?

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Tags

NGSS.MS-PS3-1

The graph shows the distance an object traveled in 11 seconds.

Which answer choice best describes the movement of the object between the times of 0 and 6 seconds on the graph?

• Moving at a constant speed

• Accelerating

• Moving toward the north

• Stopped

Tags

NGSS.MS-PS3-1

The diagrams show forces acting on a toy car as it moves to the right. Which diagram shows the toy car that will most likely accelerate to the right based on these conditions?

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Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Researchers are investigating processes that happen during digestion. Which answer choice describes only a physical change during digestion?

• Hydrochloric acid in the stomach breaks down proteins.

• Chewing in the mouth breaks food into small pieces

• Enzymes in saliva start the digestion of starches before food is swallowed.

• Bacteria in the intestines convert dietary fiber into fats.

Which statement best explains the color and texture change of the leaves?

• Plants shrink when they do not get sunlight

• Plants can grow without sunlight.

• Environmental conditions do not alter a plant's characteristics.

• Environmental conditions influence the expression of genetic traits

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

DNA is considered a universal genetic code. Which statements are true of the genetic code? Pick THREE correct sentences.

• The order of nucleotide sequences of the genetic code is the same for all living organisms.

• The components that make up the genetic code are common among all living organisms.

• Proteins are assembled from a four letter codon that specifies what amino acids are needed.

• The genetic code uses the four nucleotide bases: adenine, guanine, cytosine, and thymine.

• Amino acid sequences on the genetic code can be determined by the arrangement of the codons.

Tags

NGSS.HS-LS1-1

Delray has dimples and his wife does not. Delray has a homozygous dominant genotype for dimples, and his wife has a homozygous recessive genotype for no dimples.

If Delray and his wife decide to have children, then which Punnett square correctly shows the probability of them having a child with dimples?

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Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

Sickle-cell anemia is caused by the homozygous recessive genotype. People with sickle-cell anemia have the genotype aa. People without sickle-cell anemia have either the genotype AA or Aa. A woman with the genotype AA has a child with a man with the genotype aa. What is the probability, as a percentage, that their child will have sickle cell anemia? _______________

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3