NC Check in Biology

This diagram shows a Paramecium, a unicellular protist. When a chemical is added to the pond water in which the Paramecium lives, the Paramecium stops moving. Which structure is most likely affected?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-LS1-1

NGSS.MS-LS1-2

Which best explains why the rate of a biochemical reaction decreases at high temperatures?

• The activation energy increases.

• The shape of the enzyme changes.

• The enzyme-substrate complex forms.

• The bonds between substrates are broken.

Tags

NGSS.HS-PS1-5

A contractile vacuole helps protists eliminate excess liquid. This is a "pumping" process which reduces pressure inside the cell and prevents the cell from bursting. What is most likely the source of energy for this process?

• DNA

• lipids

• ATP

• ribosomes

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NGSS.HS-LS1-7

Which of these cells in the human body is specialized to transport oxygen throughout the body?

• 
• 
• 
• 

What would most likely be produced when a cell with eight chromosomes undergoes mitosis?

• two cells with four chromosomes each

• two cells eight chromosomes each

• four cells with four chromosomes each

• four cells with eight chromosomes each

Tags

NGSS.HS-LS1-4

During translation, what does the tRNA deliver to the ribosomes?

• amino acids

• DNA

• mRNA

• proteins

Which will most likely cause an increase in the frequency of genetic mutations in humans?

• increased exposure to mold spores in the air

• increased exposure to rising levels of atmospheric CO₂

• increased exposure to bacteria in drinking water

• increased exposure to X-rays

Tags

NGSS.HS-LS3-2

Identical twin girls are separated at birth and cared for by two different families. After twenty years, the twins have different heights and weights. What is most likely the cause of these differences?

• One twin had a genetic condition that prevented her from growing tall.

• The DNA of one twin was different from the DNA of the other twin.

• Each twin was provided a different diet and physical activities.

• The proteins made by one twin were different that the proteins made by the other twin.

Which molecules are joined together to make proteins?

• fatty acids

• nucleic acids

• amino acids

• acetic acids

Tags

NGSS.HS-LS1-6

Which best explains why the rate of photosynthesis decreases at high temperatures?

• The chlorophyll concentration decreases.

• The stomata close to prevent water loss.

• The enzymes involved in photosynthesis denature.

• The light intensity becomes too high.