STAAR EOC

How did the enzyme affect the reaction?

• Increased the activation energy

• Increase the energy change

• Lowered the energy change

• Lowered the activation energy

Answer explanation

The enzyme lowered the activation energy required for the reaction to occur, making it easier for the reaction to proceed.

Tags

NGSS.HS-PS1-4

The image below represents a cell with a semipermeable membrane. The process of osmosis would explain the net movement of water into a cell if the initial percentage of

• protein was 35% inside the cell and 30% outside the cell.

• water was 95% inside the cell and 90% outside the cell.

• water was 90% inside the cell and 95% outside the cell

• protein was 30% inside the cell and 35% outside the cell.

Answer explanation

The correct choice is water was 90% inside the cell and 95% outside the cell because osmosis involves the movement of water from an area of lower solute concentration to an area of higher solute concentration.

Structures that do not indicate shared ancestry ; structures do same functions

• Analagous structure

• Homologous structure

• Vestigial structure

• Adaptation

Answer explanation

Analagous structures are those that do not indicate shared ancestry but perform the same functions.

The stage in Interphase where DNA is replicated before it divides.

• Cancer

• Cell Cycle/Mitosis

• Meiosis

• S Phase

Answer explanation

The S Phase is the stage in Interphase where DNA is replicated before cell division, making it the correct choice.

This process removes oxygen from the atmosphere and produces ATP.

• Chloroplast

• Mitochondria

• Photosynthesis

• Cellular Respiration

Answer explanation

Cellular Respiration removes oxygen from the atmosphere and produces ATP, not Chloroplast, Mitochondria, or Photosynthesis.

Tags

NGSS.HS-LS1-7

NGSS.HS-LS2-3

This process removes carbon dioxide from the atmosphere and produces oxygen and glucose.

• Chloroplast

• Mitochondria

• Photosynthesis

• Cellular Respiration

Answer explanation

Photosynthesis is the process that removes carbon dioxide from the atmosphere and produces oxygen and glucose.

Tags

NGSS.MS-LS1-6

Cell have several mechanisms for regulating their internal environments. Which of these mechanisms involved in maintaining homeostasis requires energy?

• osmosis

• diffusion

• active transport

• passive transport

Answer explanation

Active transport is the mechanism involved in maintaining homeostasis that requires energy, unlike osmosis, diffusion, and passive transport.

A cellular process is shown. Which statement best describes the significance of this process?

• The process allows organisms to grow and heal.

• The process produces clones of the parent organism.

• The process copies DNA before cell division

• The process creates genetic variation in the resulting cells

Answer explanation

The process creates genetic variation in the resulting cells

Tags

B.6(G)

Which result is most likely to occur to the beetle population due to predation over time?

• The number of light-colored beetles in the population will increase.

• There will be more dark-colored beetles than light-colored beetles.

• The number of light-colored beetles will decrease.

• The dark-colored beetles will move to a different type of tree.

Answer explanation

The number of light-colored beetles in the population will increase as they are less likely to be preyed upon due to their color, leading to a higher survival rate.

Tags

NGSS.MS-LS2-2

NGSS.MS-LS2-4

What is the primary function of the mitochondria in eukaryotic cells?

• Energy production through cellular respiration

• Protein synthesis

• Photosynthesis

• Genetic material storage

Tags

NGSS.MS-LS1-2