Keystone Review

At a point in the cell cycle, chromosomes have aligned near the middle of a cell. Which sequence of events will the cell need to complete to produce two identical daughter cells?

•  anaphase telophase cytokinesis

• anaphase II telophase II cytokinesis II

• prophase metaphase anaphase

• metaphase II anaphase II telophase II

Tags

NGSS.HS-LS1-4

Which student correctly compared the outcomes of meiosis and mitosis?

• Student 1

• Student 2

• Student 3

• Student 4

Which process helps to preserve the genetic information stored in DNA during DNA replication?

• The replacement of nitrogen base thymine with uracil

• 1. Enzymes quickly linking nitrogen bases with hydrogen bonds

• 1. The synthesis of unique sugar and phosphate molecules for each nucleotide

• 1. Nucleotides lining up along the template strand according to base pairing rules

Which mutation would most likely affect the organism’s phenotype?

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Tags

NGSS.HS-LS1-1

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which of the following is a keystone species in many marine ecosystems?

• A) Sea otter

• B) Great white shark

• C) Blue whale

• D) Clownfish

Tags

NGSS.HS-LS4-5

What role do keystone species play in an ecosystem?

• A) They are the most abundant species.

• B) They have a disproportionate effect on their environment relative to their abundance.

• C) They are the largest species in the ecosystem.

• D) They are the primary producers.

Tags

NGSS.MS-LS2-4

NGSS.MS-LS2-2

NGSS.MS-LS2-5

In a food web, the removal of a keystone species often leads to:

• A) Increased biodiversity

• B) No significant change

• C) Collapse of the ecosystem

• D) Introduction of new species

Tags

NGSS.HS-LS4-5

NGSS.HS-LS2-6

Which of the following is an example of a keystone species in a forest ecosystem?

• A) Oak tree

• B) Gray wolf

• C) Rabbit

• D) Sparrow

Tags

NGSS.MS-LS2-4

NGSS.MS-LS2-5

How do keystone species contribute to the structure of an ecosystem?

• A) By providing food for all other species

• B) By maintaining the balance of species in the ecosystem

• C) By being the most numerous species

• D) By being the top predator

Tags

NGSS.MS-LS2-4

NGSS.MS-LS2-2

Which experiment would best demonstrate the impact of a keystone species on an ecosystem?

• A) Removing a keystone species and observing changes

• B) Adding more predators to the ecosystem

• C) Increasing the number of primary producers

• D) Introducing a new species to the ecosystem

Tags

NGSS.HS-LS2-6