Science Practice III

Bacteria are a kind of prokaryotic cell that uses ---------- to attach to other cells.

• Flagellum

• Pili

• Ribosome

• Capsule

A thin layer called the ....................... protects animal cells.

• cell wall

• cell membrane

• vacuole

• nucleus

A plant cell also has a ............... that helps the cell keep its shape.

• cell membrane

• chromosomes

• pili

• cell wall

A eukaryotic cell's chromosomes are made up of DNA, protected within the cell's ......................

• vacuole

• chromosomes

• nucleus

• cell membrane

Green plants use pigments called ............ to make food.

• chlorophyll

• chrorophyee

• cholorophyll

• vacuole

A ...................... is empty space within the cell that stores water and nutrients for the cell.

• nucleus

• chlorophyll

• vacuole

• cell membrane

Which statement is NOT a main idea about cell theory?

• Cells are the building unit of living things.

• All cells contain a nucleus and DNA.

• All cells come from other cells.

• All living things are made up of cells.

Which statement correctly identifies an advantage that reptiles gain from having scales?

• Scales provide protection from predators.

• Scales precent the skin from losing water.

• Scales improve the speed of a moving reptile.

• Scales keep embryos from drying out.

Rabbits and horses are familiar examples of animals in the class Mammalia. Therefore, rabbits and horses are all classified into the same ..................

• kingdom, phylum, and class

• phylum, class, and family

• class, genus, and family

• kingdom, species, and order

Humans, a class of ..................., are grouped in the order of primates, based on Linnaeus's system of classification.

• reptiles

• amphibians

• family

• mammals