Biology 2013 Released EOC STAAR (20 Questions)

Front

What is natural selection?

Back

Natural selection is the process by which organisms with favorable traits are more likely to survive and reproduce, leading to an increase in those traits in the population over generations.

Front

What occurs during the S phase of the cell cycle?

Back

During the S phase, DNA replication occurs, resulting in two identical sets of chromosomes for the daughter cells.

Front

What is the function of viral surface projections?

Back

Viral surface projections allow the virus to attach to a host cell, facilitating infection.

Front

What distinguishes euglena from cyanobacteria?

Back

Euglena has a nuclear membrane, while cyanobacteria do not.

Front

What is phototropism?

Back

Phototropism is the growth response of a plant toward light, often facilitated by the hormone auxin.

Front

Define homeostasis in biological systems.

Back

Homeostasis is the ability of an organism to maintain a stable internal environment despite external changes.

Front

What role do plant hormones play?

Back

Plant hormones act as chemical messengers that regulate growth, development, and responses to environmental stimuli.

Front

What is the significance of ribosomes in cells?

Back

Ribosomes are the cellular structures responsible for protein synthesis, translating genetic information into proteins.

Front

Explain the concept of geotropism.

Back

Geotropism is the growth response of a plant to gravity, with roots growing downward and shoots growing upward.

Front

What is the difference between unicellular and multicellular organisms?

Back

Unicellular organisms consist of a single cell, while multicellular organisms are made up of multiple cells that work together.