Cell Division and Transport in Cells

Chromosomes are found in pairs in human body cells.

Which of these structures is NOT found within the nucleus of a cell?

A section of DNA that codes for a specific protein is called a ______.

What is the main purpose of mitosis?

During which stage of the cell cycle does DNA replication occur?

Match the following cell cycle stages with their descriptions:

Human embryo stem cells can differentiate into all types of human cells.

What is the difference between human embryo stem cells and human adult stem cells?

What is the main function of chromosomes?

All types of plant cells can differentiate throughout their life cycle.

What is the primary purpose of therapeutic cloning?

Stem cells from ______ in plants can be used to produce clones of plants quickly and economically.

Match the following terms with their definitions:

Why are stem cells from embryos considered a good source for therapeutic cloning?

What are some risks associated with the use of stem cells in therapeutic cloning?

Explain two reasons why people might object to the use of stem cells in therapeutic cloning.

Which of these adaptations is NOT found in the gills of fish?

Osmosis is the movement of water from a concentrated solution to a dilute solution across a partially permeable membrane.

What is the main function of the lamellae in fish gills?

The ______ in plant roots increase the surface area for absorption of water and minerals.

Match the following adaptations with their corresponding structures:

Active transport moves substances against a concentration gradient and does not require energy.

Why are the membranes of the lamellae in fish gills very thin?

Which of these solutions is considered hypertonic?

As the temperature increases, the rate of diffusion slows down.

The movement of particles down their concentration gradient from areas of ______ concentration to areas of ______ concentration is called diffusion.

Which of the following is not an adaptation of the small intestine to increase the rate of nutrient absorption?

Why is a large surface area to volume ratio important for single-celled organisms?

Match the following adaptations with their respective organs:

Which of these factors influences the rate of diffusion?

The surface area to volume ratio of a larger animal will be greater than that of a smaller animal.

Explain how a good blood supply in the villi and alveoli helps maintain the concentration gradient for efficient diffusion.

The small intestines are adapted for diffusion by having ______, which increase surface area, a good blood supply, and thin membranes.

Which of the following adaptations is NOT found in the lungs to facilitate diffusion?

Active transport moves substances from a region of higher concentration to a region of lower concentration.

Explain why active transport is necessary for the absorption of minerals in root hair cells.

Match the following adaptations with the structures they are associated with:

What is the process called where particles spread from a region of higher concentration to a region of lower concentration?

Which of the following is NOT a factor that affects the rate of diffusion?

A larger surface area to volume ratio is more efficient for diffusion.

The ______ is an example of a body organ that is adapted for diffusion.

Match each example with the type of transport it represents:

What is a partially permeable membrane?

Active transport requires energy to move molecules against their concentration gradient.

Why is active transport important for the absorption of nutrients in the gut?