GED Science : Organisms

Study concepts, example questions & explanations for GED Science

varsity tutors app store varsity tutors android store

Example Questions

Example Question #1 : Biology And Life Sciences

Which of the following statements about bacteria is correct?

Possible Answers:

Bacteria lack the necessary organelles to be considered alive

Bacteria are neither alive nor dead

Bacteria cells have the same general structures and organelles as animal cells

Bacteria are considered by scientists to be alive

All bacteria require a host organism to infect

Correct answer:

Bacteria are considered by scientists to be alive

Explanation:

Bacteria are prokaryotic organisms and are considered alive. Bacteria can survive and reproduce independent of a host (consider a colony of bacteria cells growing in a Petri dish). Though they do not have membrane-bound organelles, like a nucleus or mitochondria, bacterial cells do have DNA and are still able to produce cellular energy.

This question confuses many properties of viruses with those of bacteria. Viruses are not generally considered alive and require a host cell in order to replicate.

Example Question #1 : Biology And Life Sciences

The pigments in chloroplasts absorb red light and reflect green light. During photosynthesis, the absorbed light is used as energy to convert carbohydrates to ATP for the plant to use.

Under what color light would a plant grow the slowest?

Possible Answers:

Green

Blue

Red

Yellow

Purple

Correct answer:

Green

Explanation:

The plant is only able to use absorbed light during photosynthesis; reflected light cannot be used as energy, as it is simply returned back into the surroundings. Red light will make a plant grow the fastest because it is absorbed. Since green light is reflected, growing a plant in green light will result in very slow growth. The light will effectively bounce off the plant, rather than being absorbed.

Example Question #1 : Biology And Life Sciences

What polysaccharide is used to construct the cell walls of fungi?

Possible Answers:

Peptidoglycan

Cellulose

Amylose

Chitin

Correct answer:

Chitin

Explanation:

Fungal cell walls can be differentiated from plant and bacterial cell walls in that they are made of the polysaccharide chitin. Plant cell walls use cellulose, and bacteria use peptidoglycan. Amylose is a component of starch.

Example Question #1 : Biology And Life Sciences

What is one of the primary reasons that viruses are not considered living organisms?

Possible Answers:

They do not use proteins in their structures

They are capable of causing disease

They do not make their own proteins

They do not have nucleic acids

Correct answer:

They do not make their own proteins

Explanation:

Viruses are considered non-living organisms for a variety of reasons. One of the main reasons is that viruses are incapable of creating their own proteins and must hijack host cell ribosomes in order to make them.

Virus structures contain both proteins and nucleic acids, but are unable to replicate their genetic material unless they infect a host cell.

Learning Tools by Varsity Tutors