2025 academic biology final review study topics & directions/tips
22. what is a hypertonic solution? define and draw.
23. what is a hypotonic solution? define and draw:
24. define diffusion.
25. what is the purpose of mitosis?
26. phases of mitosis in correct order:
27. longest phase of the cell cycle is _______________
28. what is a possible result of uncontrolled cell growth is _______________

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Accepted Answer

### Question 22:
# Brief Explanations:
A hypertonic solution has a higher solute concentration (and lower water potential) than the solution it is compared to (e.g., a cell's cytoplasm). When a cell is placed in a hypertonic solution, water moves out of the cell (via osmosis) to the area of higher solute concentration, causing the cell to shrink (plasmolysis in plant cells, crenation in animal cells). For drawing, show a cell with arrows indicating water leaving, and label the solution as having more solute outside the cell.
# Answer:
A hypertonic solution is one with a higher solute concentration (lower water potential) relative to another solution (e.g., a cell’s interior). Water exits cells in it, causing shrinkage (plasmolysis/crenation). (Drawing: Cell with water arrows outward, higher solute outside.)

### Question 23:
# Brief Explanations:
A hypotonic solution has a lower solute concentration (and higher water potential) than the solution it is compared to (e.g., a cell's cytoplasm). When a cell is placed in a hypotonic solution, water moves into the cell (via osmosis) from the area of higher water potential, causing the cell to swell (turgor in plant cells, lysis in animal cells if too much water enters). For drawing, show a cell with arrows indicating water entering, and label the solution as having less solute outside the cell.
# Answer:
A hypotonic solution has a lower solute concentration (higher water potential) relative to another solution (e.g., a cell’s interior). Water enters cells in it, causing swelling (turgor/lysis). (Drawing: Cell with water arrows inward, lower solute outside.)

### Question 24:
# Brief Explanations:
Diffusion is the passive movement of particles (atoms, molecules, ions) from an area of higher concentration to an area of lower concentration. This occurs due to the random thermal motion (kinetic energy) of particles and continues until equilibrium (equal concentration throughout) is reached. It does not require energy and is a key process for transport in cells (e.g., oxygen into cells, carbon dioxide out) and in the environment.
# Answer:
Diffusion is the passive, random movement of particles from a region of higher concentration to lower concentration (down a concentration gradient) until equilibrium is reached, driven by kinetic energy (no energy input required).

### Question 25:
# Brief Explanations:
The purpose of mitosis is to produce two genetically identical daughter cells from a single parent cell. This is crucial for growth (increasing cell number in multicellular organisms), repair (replacing damaged or dead cells), and asexual reproduction (in single - celled organisms or some multicellular organisms like plants that can propagate asexually). It ensures that each new cell has the same genetic material (DNA) as the parent cell, maintaining genetic stability.
# Answer:
The purpose of mitosis is to generate two genetically identical daughter cells for growth, repair (tissue renewal), and asexual reproduction, preserving genetic consistency.

### Question 26:
# Brief Explanations:
The phases of mitosis in correct order are: 1. Prophase: Chromosomes condense, the nuclear envelope breaks down, and the mitotic spindle forms. 2. Metaphase: Chromosomes line up along the equator (metaphase plate) of the cell, attached to spindle fibers at their centromeres. 3. Anaphase: Sister chromatids separate at the centromere and are pulled to opposite poles of the cell by the spindle fibers. 4. Telophase: Chromosomes de - condense, the nuclear envelope reforms around each set of chromosomes, and the spindle breaks down. (Cytokinesis, the division of the cytoplasm, often occurs simultaneously with telophase or shortly after, but it is not part of mitosis itself.)
# Answer:
The phases of mitosis in order are: Prophase → Metaphase → Anaphase → Telophase.

### Question 27:
# Brief Explanations:
The cell cycle consists of interphase (G₁, S, G₂) and mitosis (M phase). Interphase is the longest phase. Specifically, the G₁ (Gap 1) phase is often the longest part of interphase, where the cell grows, performs its normal functions, and prepares for DNA replication. The S phase is for DNA synthesis, and G₂ is for further growth and preparation for mitosis. Mitosis itself is a relatively short phase compared to interphase.
# Answer:
The longest phase of the cell cycle is **Interphase** (specifically often G₁ phase within interphase).

### Question 28:
# Brief Explanations:
Uncontrolled cell growth means that cells divide and proliferate without the normal regulatory mechanisms that control the cell cycle. This can lead to the formation of a tumor. If the tumor cells can invade nearby tissues and spread to other parts of the body (metastasize), it is called cancer. Uncontrolled cell growth disrupts normal tissue function and can cause damage to organs and systems.
# Answer:
A possible result of uncontrolled cell growth is the formation of a **tumor** (and potentially cancer, if cells become malignant and metastasize).

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