GED Science : Organisms
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Example Question #1 : Biology And Life Sciences
Which of the following statements about bacteria is correct?
All bacteria require a host organism to infect
Bacteria cells have the same general structures and organelles as animal cells
Bacteria are considered by scientists to be alive
Bacteria lack the necessary organelles to be considered alive
Bacteria are neither alive nor dead
Bacteria are considered by scientists to be alive
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?
Purple
Blue
Red
Yellow
Green
Green
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?
Amylose
Chitin
Peptidoglycan
Cellulose
Chitin
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?
They do not have nucleic acids
They do not use proteins in their structures
They do not make their own proteins
They are capable of causing disease
They do not make their own proteins
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.
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