6th Grade Science Final Exam

The picture below shows two types of cells X and Y.

• X is eukaryotic, and Y is prokaryotic.

• X is prokaryotic, and Y is eukaryotic.

• X is eukaryotic, and Y is eukaryotic.

• X is prokaryotic, and Y is prokaryotic.

Answer explanation

Pro means NO!

No Nucleus!

Prokaryotic Cells DO NOT have a Nucleus!

Tags

NGSS.MS-LS1-1

NGSS.MS-LS1-2

The absence of which cell structure would indicate a cell is prokaryotic?

• Ribosomes

• Nucleus

• Cell membrane

• Cytoplasm

Answer explanation

Tags

NGSS.MS-LS1-1

NGSS.MS-LS1-2

Four students were trying to apply their knowledge of cell theory to scenarios outside of the classroom. Here is what each said:

Jose: Rocks are made of little things that I can look at under a microscope. So, according to cell theory, rocks must be alive.

Cali: All organisms are made of cells. Since a paramecium is made up of only one cell, it is not considered an organism.

Peter: Organelles are the parts that make up cells. So, organelles are the basic structures of life.

Jasmine: When I get a cut on my arm, new skin cells form and help it grow back together. That shows how cells come from other cells.

• A. Jose, because rocks are made up of things that I can see under the microscope, so it must be alive.

• B. Cali, because organisms need to have more than one cell.

• C. Peter, because he said that organelles are the basic unit of life.

• D. Jasmine, because she said that new cells come from other cells.

Answer explanation

Tags

NGSS.MS-LS1-5

Look at the diagrams of two basic cell types. (Cell 1 and Cell 2 are shown in the diagrams.) Which of the following describes Cell 2?

• a plant cell

• an animal cell

• a eukaryote cell

• a prokaryote cell

Tags

NGSS.MS-LS1-1

Within an ecosystem, there are levels of organization. Which levels are missing from the diagram below?

• Biome, Community

• Community, Cell

• Cell, Population

• Population, Community

Answer explanation

A student recently recorded both living and non-living (abiotic) in their notebook • Trees • Rocks • Doves • Grasses • Lake • Snakes • Cloudy sky • Temperature

Which level of organization is represented by the student’s observations?

• Population

• Ecosystem

• Organism

• Community

Which answer choice best illustrates the levels of organization from organism to ecosystem as observed in the image?

• Grasses → herd → herd and grasses → herd, grasses, soil and weather

• Buffalo → herd → herd and grasses → herd, grasses, soil, and weather

• Herd → grasses → herd and grasses → herd, grasses, soil and weather

Tags

NGSS.MS-LS2-3

A remora is a fish that has an adhesive disk on the back of its head that it uses to attach itself to a large shark. When food floats away from the shark’s mouth as it feeds, the remora collects the scraps.

The relationship between the remora and the shark is an example of —

• predation

• parasitism

• commensalism

• competition

Answer explanation

Water has the chemical formula H₂O. Which statement correctly describes water?

• Water is a pure substance.

• Water is not a pure substance, but is an element.

• Water is not a pure substance, but is a mixture.

• Water is a pure substance and an element.

Tags

NGSS.MS-PS1-1

Mixing silver nitrate and sodium chloride in water will cause silver chloride to precipitate out of solution. In this example, the precipitate is silver chloride. Which example represents the formation of a precipitate?

• White chunks form when you add vinegar to milk or heavy cream.

• Heat and light are produced when paper burns.

• Gas is released when vinegar and baking soda are mixed together.

• A cut apple turns brown when left out in the open air.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5