Ecology, Macromolecules & Cells Quiz

Certain bacteria are normally found in the human intestine and are beneficial to human health. How would this relationship between humans and bacteria be BEST described?

• parasitism
• mutualism
• predator/prey
• commensalism

What could cause a population to reach its carrying capacity?

• the population adapts
• the population becomes extinct
• the population has a limited food supply
• the population finds a new food source

Which of the following best explains what will occur when a population grows larger than the carrying capacity of its environment?

• the emigration rate will decrease
• The competition rate will decrease
• The birth rate will increase
• the death rate will increase

Which is an example of parasitism?

• fleas feeding on a dog
• barnacles attaching themselves to a whale
• algae and fungus living together as a lichen
• clownfish seeking protection in a sea anemone

Which is the correct representation of energy flow through an ecosystem?

• water-->squirrels-->nuts
• sun-->consumers-->producers
• autotrophs-->heterotrophs-->sun
• sun-->autotrophs-->heterotrophs

If a decline of the nitrogen fixing bacteria population took place worldwide, what would MOST LIKELY be the result?

• a decrease in usable oxygen worldwide
• an increase in denitrification worldwide
• a decrease in usable nitrogen worldwide
• an increase in the uptake of usable nitrogen by plant life

To which category of organic compounds do enzymes belong?

• lipids
• proteins
• nucleic acids
• carbohydrates

Proteins are compounds formed in the cells of plants and animals. Which element is included in every protein molecule?

• calcium
• carbon
• fluorine
• sodium

A student uses a light microscope to compare Elodea plant cells and stained cheek cells. Which two structures would MOST LIKELY be observed in the Elodea cells that are absent in cheek cells?

• cell wall and plasma membrane
• chloroplast & cell wall
• cytoplasm & cell wall
• cytoplasm & nucleus

Which pair of organelles is responsible for the energy supply to eukaryotic cells?

• nucleus and ribosomes
• mitochondria and nucleus
• ribosomes and chloroplasts
• mitochondria and chloroplasts