Bio Staar Review

Front

What is natural selection?

Back

Natural selection is the process by which organisms that are better adapted to their environment tend to survive and produce more offspring. It leads to changes in inherited traits in a population over time.

Front

What are inherited traits?

Back

Inherited traits are characteristics that are passed from parents to offspring through genes. Examples include eye color, height, and certain behaviors.

Front

What is an allele?

Back

An allele is a variant form of a gene that can result in different traits. For example, a gene for flower color may have a red allele and a white allele.

Front

What does it mean if an allele increases in a population?

Back

If an allele increases in a population, it means that the trait associated with that allele is becoming more common, often due to natural selection favoring individuals with that trait.

Front

What is a hypertonic solution?

Back

A hypertonic solution is one that has a higher concentration of solutes compared to another solution, causing cells in that solution to lose water and shrink.

Front

What is the cell cycle?

Back

The cell cycle is the series of phases that a cell goes through to grow and divide. It includes phases such as G1, S (synthesis), G2, and M (mitosis).

Front

What happens during the S phase of the cell cycle?

Back

During the S phase, DNA replication occurs, resulting in the duplication of the cell's genetic material.

Front

What are prokaryotes?

Back

Prokaryotes are single-celled organisms that lack a nucleus and membrane-bound organelles. Bacteria are the most common examples of prokaryotes.

Front

What are eukaryotes?

Back

Eukaryotes are organisms whose cells contain a nucleus and membrane-bound organelles. Examples include plants, animals, and fungi.

Front

What is the difference between autotrophs and heterotrophs?

Back

Autotrophs are organisms that produce their own food through photosynthesis or chemosynthesis, while heterotrophs obtain their food by consuming other organisms.