Biology STAAR EOC Review

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

Which of these is a function of the cell membrane in all cells?

• Producing cellular nutrients

• Maintaining homeostasis

• Neutralizing chemicals

• Preserving cellular wastes

Answer explanation

The function of the cell membrane in all cells is to maintain homeostasis by regulating the passage of substances in and out of the cell.

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.

Tags

NGSS.MS-LS2-1

Which of the following is correct about the events of the cell cycle?

• Little happens during the G₁ and G₂ phases of the cell cycle.

• DNA replicates during the S phase of interphase.

• Mitosis is usually the longest phase of the cell cycle when the cell is growing.

• Interphase consists of G₁, S, G2 phase and mitosis

Answer explanation

The correct statement is that DNA replicates during the S phase of interphase.

Tags

NGSS.HS-LS1-4

Two organisms that are closely related would have

• very similar DNA sequence

• exactly the same DNA sequences

• no proteins in common

• completely different DNA sequence

Tags

NGSS.HS-LS3-1

What is the term used to describe the movement of alleles between populations?

• Genetic drift

• Gene flow

• Natural selection

• Mutation

A structure that is no longer used by an organism. Remnants of what ancestors had.

• Analagous structure

• Homologous structure

• Vestigial structure

• Adaptation

Answer explanation

A vestigial structure is a structure that is no longer used by an organism and is remnants of what ancestors had.

Tags

NGSS.MS-LS4-2

Structures that indicate shared ancestry ; look similar anatomically

• Analagous structure

• Homologous structure

• Vestigial structure

• Adaptation

Answer explanation

Homologous structures indicate shared ancestry and look similar anatomically, making them the correct choice in this context.

Tags

NGSS.MS-LS4-2

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.

Tags

NGSS.MS-LS4-2

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.