Regents Practice Part 3

Which activity is an example of a decomposer recycling organic compounds back into the environment?

• A tree synthesizes starch from simpler molecules.

• A bacterial cell performs photosynthesis.

• A bird digests proteins from its food.

• A fungus breaks down the body of a dead animal.

Two organisms of different species are not likely to compete for the same

• food

• mate

• space

• water

An increase in human population puts a stress on resources that can be renewed, such as

• trees and coal

• water and gasoline

• oil and natural gas

• water and trees

Global warming is most closely associated with

• increased use of solar panels

• increased industrialization

• reducing the rate of species extinction

• removal of environmental wastes

1 Some salmon have been genetically modified to grow bigger and faster than wild salmon. They are grown in fish-farming facilities. These genetically modified fish should not be introduced into a natural habitat because

• the salmon would recycle nutrients at a rapid rate

• their rapid growth rate could cause them to outcompete native salmon

• they would not have enough oxygen for survival

• they would reproduce asexually once they were released

Certain seaweeds contain a greater concentration of iodine inside their cells than there is in the seawater surrounding them. The energy required to maintain this concentration difference is most closely associated with the action of

• ribosomes

• mitochondria

• vacuoles

• nuclei

Doctors sometimes use a vaccine to prepare the body to defend itself against future infections. These vaccines most often contain

• antibodies

• antibiotics

• white blood cells

• weakened pathogens

Anhidrosis is the inability to sweat normally. If the human body cannot sweat properly, it cannot cool itself, which is potentially harmful. Anhidrosis most directly interferes with

• a feedback mechanism that maintains homeostasis

• an immune system response to harmless antigens

• the synthesis of hormones in the circulatory system

• the synthesis of hormones in the circulatory system

In a sewage treatment facility, an optimal environment is maintained for the survival of naturally occurring species of microorganisms. These organisms can then break the sewage down into relatively harmless wastewater. For these microorganisms, the wastewater facility serves as

• its carrying capacity

• a food chain

• an ecosystem

• an energy pyramid

When handling cat litter, humans can potentially be exposed to a harmful single-celled protozoan. Its primary host is the common domestic cat, but it can also live in humans. This protozoan is an example of a

• predator

• producer

• parasite

• scavenger