SSA Review: Life Science

Which of the following best describes the relationship between DNA, genes, and chromosomes?

• DNA is a type of gene and is located on chromosomes

• Genes are made of DNA, and chromosomes combine to form genes

• DNA forms chromosomes, and every gene contains 2 or more chromosomes

• Genes are sections of DNA, and chromosomes are made of DNA

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For a particular species of dog, brown fur (B) is dominant to white fur (b). What is the genotype of a dog that is homozygous and has brown fur?

• Brown fur

• White fur

• BB

• Bb

A limiting factor is anything that keeps a population's size from increasing beyond a certain point. Which of the following would be an abiotic limiting factor for fish living in a retention pond in Florida?

• The other fish that live in the pond

• The temperature of the water in the pond

• The humans that catch fish from the pond

• A dead log that has fallen into the pond

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When an athlete goes for a long run on a hot summer day in Florida, they sweat a lot. How would the athelete's nervous system most likely respond to this?

• The nervous system would signal the respiratory system to take in more oxygen.

• The nervous system would make the athlete feel thirsty so they would drink more.

• The nervous system would cause the athlete to shiver in order to warm them up.

• The nervous system would increase the body's production of red blood cells.

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Several residents in a small town in the northern part of a country called Finland recently became sick. All of the sick people had the same symptoms. Scientists took blood samples and looked at them using high-powered microscopes. They finally found the organism that they believed was responsible for making the people sick. They observed that this organism appeared to be living, but could only reproduce when it inserted itself into an infected person's cell.

What type of infectious agent caused the people to get sick?

• bacteria

• fungus

• parasite

• virus

The kangaroo mouse is a small rodent that lives in the desert in the Southwestern United States. Which of the following would be the most helpful adaptation for kangaroo mice?

• fur that is light brown

• the ability to swim

• thick fur to keep them warm

• the ability to climb trees

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The food web shown is for a forest ecosystem. In this ecosystem, how would the population of rabbits change if a disease caused most of the snakes to die?

• The rabbit population would stay the same.

• The rabbit population would increase.

• The rabbit population would decrease.

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Which of the following best explains the data in the table?

• Heart cells have more mitochondria than skin cells because they are more important to the body.

• Heart cells have more mitochondria than skin cells because they are inside the body rather than on the outside of the body.

• Heart cells have more mitochondria than skin cells because they need more energy.

• Heart cells have more mitochondria than skin cells because the body has more heart cells than skin cells.

A botanist is a scientist who studies plants. A botanist is studying the garden pea plant (Pisum sativum). For this plant, purple flowers (P) are dominant to white flowers (p).

If the botanist crosses a heterozygous purple plant with a purbred white plant, what is the probability that the offspring will have white flowers?

• 0%

• 25%

• 50%

• 100%

The diagram shows part of the carbon cycle. What is represented by the arrow labeled as '1'?

• Animals are releasing carbon dioxide into the environment through photosynthesis.

• Animals are decomposing and releasing carbon into the soil.

• Animals are converting carbon dioxide from the atmosphere to

  oxygen.

• Animals are releasing

  carbon dioxide into the atmosphere through cellular respiration.

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