Science: Life Science Practice Test Flashcards

During which phase of mitosis do chromosomes line up along the cell's equator?

Answer: Metaphase

During metaphase, chromosomes align at the metaphase plate (cell equator), allowing spindle fibers to attach and separate them equally.

A patient has a blocked lymphatic vessel. Which body function would most likely be impaired?

Answer: Removal of excess fluid from tissues

The lymphatic system drains excess interstitial fluid from tissues; a blockage causes fluid buildup called lymphedema.

Which of the following is an example of a mutualistic relationship?

Answer: Clownfish living among sea anemone tentacles for mutual benefit

Clownfish and sea anemones benefit each other — the fish is protected by the anemone, and it keeps the anemone clean.

In which phase of the cell cycle does DNA replication occur?

Answer: S phase

DNA replication occurs during the S (synthesis) phase of interphase, before the cell begins mitosis.

What adaptation allows desert cacti to minimize water loss?

Answer: Thick waxy cuticle and modified leaves (spines)

Cacti have a thick waxy cuticle and spines instead of leaves to dramatically reduce water loss through transpiration.

Which level of biological organization is ABOVE the organism level?

Answer: Population

A population consists of multiple organisms of the same species living in the same area, placing it above the organism level.

A scientist observes that a certain bacteria can survive extremely high temperatures. This trait is most likely an example of:

Answer: Genetic mutation leading to natural selection

Heat resistance in bacteria arises from mutations that are naturally selected because they confer a survival advantage in high-temperature environments.