High School Biology : Introductory Topics

Study concepts, example questions & explanations for High School Biology

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Example Questions

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Example Question #14 : Understanding Requirements For Life And Cell Theory

Which of the following best describes the “central dogma” of molecular biology?

Possible Answers:

DNA to protein to RNA

DNA to RNA to protein

Protein to RNA to DNA

RNA to DNA to protein 

Correct answer:

DNA to RNA to protein

Explanation:

DNA—deoxyribonucleic acid—is found in chromosomes within a cell’s nucleus. A complete set of DNA (i.e. 46 chromosomes) is called a genome. DNA contains instructions that make humans different from other species and other individuals. DNA provides instructions for all the proteins that the body makes and is passed from adults to offspring.  DNA cannot get out of the nucleus; however, RNA can. RNA is used to get the instructions from DNA out of the nucleus and into the site of protein synthesis: the ribosomes within the cytoplasm. Proteins are made of amino acids and determine the structure and function of all of the body’s cells; therefore, this process can be simplified into “DNA to RNA to protein.”

Example Question #21 : Understanding Requirements For Life And Cell Theory

Which of the following illustrates the cell theory?

Possible Answers:

Cells commit suicide when their DNA is damaged.

Many times, humans crave salt because there is an internal deficiency of salt in the blood. 

Plants are able to grow and move towards sunlight, that's why the plants in my room are tilted towards the window.

The bacteria on the chicken that has been out overnight does not grow on its own but divides and multiplies from one or more original cells.

Humans sweat to maintain body temperature in a certain range. Sweating helps to release heat.

Correct answer:

The bacteria on the chicken that has been out overnight does not grow on its own but divides and multiplies from one or more original cells.

Explanation:

The cell theory is the idea that 1) all living things are made of one or more cells, 2) cells are the basic unit of life and 3) all cells come from other cells.

Bacteria, whether infecting humans or foods, originates from other bacterial cells. That illustrates the third point of the cell theory. 

Example Question #42 : Attributes Of Life

What is the basic unit of life?

Possible Answers:

DNA

A molecule

A chromosome

An atom

A cell

Correct answer:

A cell

Explanation:

The basic unit of life is a cell and this is defined by the cell theory. It can live on its own, unicellularly, as in bacteria, or it can be a part of a multicellular organism. 

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