Biology STAAR Practice

Front

What is an enzyme inhibitor?

Back

An enzyme inhibitor is a substance that decreases the activity of an enzyme by preventing substrate binding.

Front

What happens to a substrate when an enzyme is inhibited?

Back

A substrate will be unable to attach to the enzyme.

Front

What is the structure of DNA?

Back

DNA is a double helix made up of two strands of nucleotides, which include a sugar, phosphate group, and nitrogenous base.

Front

What are nitrogenous bases in DNA?

Back

Nitrogenous bases are the building blocks of DNA that pair specifically: adenine (A) with thymine (T), and cytosine (C) with guanine (G).

Front

What does complementary DNA strand mean?

Back

A complementary DNA strand is one that matches the base sequence of another strand according to base pairing rules.

Front

What is the consequence of excessive ultraviolet radiation exposure?

Back

Excessive exposure to ultraviolet radiation can lead to skin cancer.

Front

What characterizes a prokaryotic cell?

Back

A prokaryotic cell is characterized by the absence of a nucleus and membrane-bound organelles.

Front

What is the role of ribosomes in a cell?

Back

Ribosomes are responsible for protein synthesis in both prokaryotic and eukaryotic cells.

Front

What is the function of the cell membrane?

Back

The cell membrane controls the movement of substances in and out of the cell, maintaining homeostasis.

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.