Keystone Homework #2

Which statement best compares the plasma membrane in prokaryotes and eukaryotes?

• The plasma membrane is a single layer of lipids in prokaryotes, but it is a bilayer in eukaryotes .

• The plasma membrane in both prokaryotes and eukaryotes separates the cell from the external environment .

• The plasma membrane is lined with ribosomes in prokaryotes, but it is lined with lipids in eukaryotes .

• The plasma membrane in both prokaryotes and eukaryotes contains chloroplasts for starch storage

Which conclusion is best supported by the presence of ribosomes in prokaryotes and eukaryotes?

• Ribosomes have different functions in prokaryotes and eukaryotes .

• Both prokaryotes and eukaryotes store energy to power life functions .

• Ribosomes developed independently inside prokaryotes and eukaryotes .

• Both prokaryotes and eukaryotes make proteins to perform life functions

Which statement best compares eukaryotic cells and prokaryotic cells?

• Eukaryotic cells are smaller than prokaryotic cells.

• Prokaryotic cells are more complex than eukaryotic cells.

• Prokaryotic cells contain a distinct central organelle, and eukaryotic cells do not.

• Eukaryotic cells contain membrane-bound organelles, and prokaryotic cells do not.

Trees are typically able to transport water from their roots to their stems and leaves. Which statement describes the property of water that most supports the transportation of water to all parts of a tree?

• Water forms a crystalline structure when it freezes.

• Water dissolves fewer substances than any other liquid.

• Water has strong attractions to itself and many other molecules.

• Water can absorb large amounts of energy with minimal temperature changes.

Carbon can combine with many different elements but frequently combines with oxygen, hydrogen, and nitrogen to form organic molecules. Which statement best explains why carbon is able to form a large number of different molecules?

• Carbon forms only ionic bonds.

• Carbon can form only ring structures.

• Carbon can form four covalent bonds.

• Carbon forms small, simple structures.

Tags

NGSS.HS-LS1-6

Life functions are performed at many levels of biological organization. Which level of biological organization is the simplest level at which a structure can support life functions?

• cell

• tissue

• organelle

• organ system

Tags

NGSS.MS-LS1-1

NGSS.MS-LS1-2

Which statement best explains why these cells have structural differences?

• The cells have different functions.

• The cells evolved in different organisms.

• One of the cells develops into the other type of cell.

• One of the cells is more primitive than the other cell.

Tags

NGSS.MS-LS1-2

NGSS.MS-LS1-3