Biology Keystone Mixed Review

When DNA separates into two strands, the DNA would most likely be directly involved in

• replication

• fertilization

• differentiation

• evolution

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NGSS.HS-LS3-2

Which population of organisms would be in greatest danger of becoming extinct?

• A population of organisms having few variations living in a stable environment.

• A population of organisms having few variations living in an unstable environment.

• A population of organisms having many variations living in a stable environment.

• A population of organisms having many varia- tions living in an unstable environment.

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NGSS.HS-LS4-5

A student observes that an organism is green. A valid conclusion that can be drawn from this observation is that

• the organism must be a plant

• the organism cannot be single celled

• the organism must be an animal

• not enough information is given to determine whether the organism is a plant or an animal

When a person does strenuous exercise, small blood vessels (capillaries) near the surface of the skin increase in diameter. This change allows the body to be cooled. These statements best illustrate

• synthesis

• homeostasis

• excretion

• locomotion

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NGSS.HS-LS1-3

Which ecological term includes everything represented in the illustration below?

• ecosystem

• community

• population

• species

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NGSS.MS-LS2-3

Which sequence represents the correct order of levels of organization found in a complex organism?

• cells → organelles → organs → organ systems → tissues

• tissues → organs → organ systems → organelles → cells

• organelles → cells → tissues → organs → organ systems

• organs → organ systems → cells → tissues → organelles

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NGSS.HS-LS1-2

Scientific studies show that identical twins who were separated at birth and raised in different homes may vary in height, weight, and intelligence. The most probable explanation for these differences is that

• original genes of each twin increased in number as they developed

• one twin received genes only from the mother while the other twin received genes only from the father

• environments in which they were raised were different enough to affect the expression of their genes

• environments in which they were raised were different enough to change the genetic makeup of both individuals

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NGSS.MS-LS1-5

The instructions for the traits of an organism are coded in the arrangement of

• glucose units in carbohydrate molecules

• bases in DNA in the nucleus

• fat molecules in the cell membrane

• energy-rich bonds in starch molecules

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NGSS.HS-LS3-2

NGSS.HS-LS3-1

NGSS.HS-LS1-1

In heterotrophs, energy for the life processes comes from the chemical energy stored in the bonds of

• water molecules

• oxygen molecules

• organic compounds

• inorganic compounds

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NGSS.HS-LS1-7

The diagram above shows a process that can occur during meiosis. The most likely result of this process is

• a new combination of inheritable traits that can appear in the offspring

• an inability to pass either of these chromosomes on to offspring

• a loss of genetic information that will produce a genetic disorder in the offspring

• an increase in the chromosome number of the organism in which this process occurs

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NGSS.HS-LS3-2

NGSS.HS-LS3-1