PBS EOC Sample Items

A Crime Scene Investigator (CSI) is called to the scene of a mysterious death. Which of the following is NOT one of the initial steps used to process a crime scene?

• Interview witnesses to establish a theory of the case.

• Examine the crime scene and mark any evidence.

• Perform DNA analysis on all biological samples.

• Sketch a diagram of the crime scene.

Investigators collected the following evidence from a crime scene: Type A blood, Dyed brown hair, Whorl pattern fingerprint, and a Shoe print. Suspect #1 was found to have type A blood, dyed brown hair, low similarities in fingerprint match and hiking shoes. Which of the following could be used to potentially eliminate suspect #1 as a suspect?

• Blood type A

• Dyed brown hair

• The fingerprint

The graph represents the diameter of the bloodstain (cm) versus the height from which it was dropped (cm). Using the graph, from what height was the blood most likely dropped that would result in a blood stain pattern with a diameter of 1.9 cm?

• 80cm

• 120cm

• 150cm

• 200cm

A student tested four unknown food samples for their nutritional content. The student's results are recorded in the table below. According to the table, which unknown sample would be the least healthiest choice?

• Unknown sample 1

• Unknown sample 2

• Unknown sample 3

• Unknown sample 4

On a cold day, a person's body temperature begins to drop. The cold stimulates this person's brain cells. The brain cells send a signal to other cells that release a hormone that starts a biochemical pathway. This increases the metabolic activity of the cells of the person's body. The increased cellular activity produces heat. This heat helps restore this person's normal body temperature. When the body temperature is normal, the brain cells stop sending a signal. Which type of process does this example describe?

• A positive feedback loop

• A cause-effect feedback loop

• A negative feedback loop

• A neutral feedback loop

Tags

NGSS.HS-LS1-3

Which statement best describes how complex molecules in food are broken down into simpler molecules?

• Sugars break down into starch

• Monosaccharides break down into polysaccharides

• Triglycerides break down into lipids

• Proteins break down into amino acids

Tags

NGSS.HS-LS1-7

The diagram represents the molecular structure of an organic compound. Which class of macromolecules uses this structure as a building block?

• Fats

• Carbohydrates

• Nucleic Acids

• Proteins

What does an elevated white blood cell count typically indicate?

• A defect in the liver

• Anemia

• A rise in oxygen concentration

• An infection

Which of the following describes how the protein hemoglobin helps red blood cells?

• It carries oxygen to the tissues of the body

• It monitors glucose levels in the body

• It protects the body from viruses and bacteria

• It carries oxygen to the tissues of the body

What is the primary factor that determines the three-dimensional shape of a protein?

• The structure of the peptide bonds

• The sequence of amino acids

• The sequence of peptide bonds

• The structure of amino acids

Tags

NGSS.HS-LS1-1