Biology STAAR Practice Semester 1

Front

What is a prokaryote?

Back

A single-celled organism that lacks a nucleus and membrane-bound organelles.

Front

What is the role of spindle fibers during cell division?

Back

Spindle fibers help separate chromosomes to ensure each new nucleus receives one copy of each chromosome.

Front

What processes are involved in maintaining homeostasis?

Back

Transport of molecules and energy conversions are key processes involved in maintaining homeostasis.

Front

What are nitrogenous bases?

Back

Nitrogenous bases are the building blocks of DNA and RNA that pair specifically to encode genetic information.

Front

What is complementary base pairing in DNA?

Back

Complementary base pairing refers to the specific pairing of nitrogenous bases: adenine with thymine, and cytosine with guanine.

Front

How does the sequence of nitrogenous bases affect protein synthesis?

Back

The order of nitrogenous bases in DNA determines the sequence of amino acids in proteins, influencing their structure and function.

Front

What is the significance of the double helix structure of DNA?

Back

The double helix structure allows for the stable storage of genetic information and facilitates replication and transcription.

Front

What is the function of ribosomes in a cell?

Back

Ribosomes are the sites of protein synthesis, where amino acids are assembled into proteins based on mRNA sequences.

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.

Front

What is homeostasis?

Back

Homeostasis is the process by which living organisms maintain a stable internal environment despite external changes.