Biology MCAS Review

You will get 2 minutes to answer each multiple choice. However, on the test, there is no time limit. 

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Structures called microtubules are found in the cytoplasm of most eukaryotic cells. Microtubules are made up of proteins and help shape and support the cell. Which of the following elements are most abundant in microtubules?

• lead and zinc
• nitrogen and carbon
• sodium and chlorine
• iodine and magnesium

Under which of the following conditions would an animal population most likely survive the effects of rapid climate change?

• The population is highly mobile.
• The population has a small geographic range.
• The individuals in the population are carnivorous
• The females in the population have one or two offspring per litter.

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In 1995, 15 iguanas of the species Iguana iguana floated to the Caribbean island of Anguilla on a tree uprooted by a hurricane. No other iguanas of that species existed on Anguilla. Scientists think that the iguanas came from the island of Guadeloupe, about 120 km southeast of Anguilla. Which of the following factors has the most influence on whether the iguanas on Anguilla will become a separate species from the iguanas on Guadeloupe over time?

• how long ago the island of Anguilla was formed
• . how much variation there is in the body size of the iguanas
• how many base pairs are in the DNA sequence of the iguanas
•  how different the environment on Anguilla is from that on Guadeloupe

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• A
• B
• C
• D

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• A
• B
• C
• D

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In the human heart, a group of cells in the wall of the right atrium produces nerve impulses that stimulate cardiac muscle. What do these nerve impulses directly control? 

• the amount of oxygen in the blood
• the release of platelets into the blood
• . the speed at which the heart pumps blood
• the path blood takes when it leaves the heart

A body cell of a sand dollar has 52 chromosomes. How many chromosomes should a sand dollar gamete contain?

• 26
• 52
• 78
•  104

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An English doctor is given credit for developing the modern terrarium in the 1800s. The doctor kept some plants in a sealed glass jar containing soil and air. The plants survived in the sealed jar for four years. What two processes allowed the plants to cycle nutrients and survive in the sealed jar?

• meiosis and fertilization
• . mutualism and commensalism
• photosynthesis and cellular respiration
• asexual reproduction and sexual reproduction

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• A
• B
• C
• D

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