5th Period Biology STAAR Review 2025

Front

What are the chemical elements present in DNA?

Back

DNA is primarily composed of carbon (C), hydrogen (H), oxygen (O), nitrogen (N), and phosphorus (P).

Front

What is the effect of a sudden increase in the cricket population on the ecosystem?

Back

A sudden increase in the cricket population would likely lead to a decrease in the grass/flowers population due to increased herbivory.

Front

What do the owl and the weasel compete for in the food web?

Back

The owl and the weasel compete for the shrew.

Front

What is the purpose of translation in protein synthesis?

Back

The purpose of translation is to convert the genetic code from mRNA into a specific sequence of amino acids to form a protein.

Front

What are the products of meiosis?

Back

The products of meiosis are genetically different gametes (sperm and eggs).

Front

Define meiosis.

Back

Meiosis is a type of cell division that reduces the chromosome number by half, resulting in four genetically diverse gametes.

Front

What is the role of nucleotides in DNA?

Back

Nucleotides are the building blocks of DNA, consisting of a sugar, a phosphate group, and a nitrogenous base.

Front

Explain the concept of competition in an ecosystem.

Back

Competition occurs when two or more organisms vie for the same resources, such as food, space, or mates.

Front

What is the significance of genetic diversity?

Back

Genetic diversity is important for the survival and adaptability of a species, allowing for better responses to environmental changes.

Front

What is the difference between DNA and RNA?

Back

DNA is double-stranded and contains thymine, while RNA is single-stranded and contains uracil instead of thymine.