Cells and Microorganisms

Plant cells need different structures than animal cells because only plants __________.

• grow larger over time

• require water

• make their own food

• produce offspring

Tags

NGSS.MS-LS1-6

Cells require a structure that regulates the transfer of material in and out of the cell. This structure, found in both plant and animal cells, is called the __________.

• cell membrane

• mitochondria

• nucleus

• chloroplast

Which of the following is a characteristic of most cells?

Most cells __________.

• make their own food through photosynthesis

• are too small to be seen without magnification

• need to eat other cells to survive

• are cubic and stack on each other like blocks

Which cell structure is the control center and contains the cell’s genetic information?

• nucleus

• chloroplast

• cytoplasm

• vacuole

Cells require a thick, jellylike substance that holds organelles in place inside the cell. This substance is known as __________.

• chlorophyll

• DNA

• cytoplasm

• nucleus

Which observation supports the claim that microorganisms are helpful to ecosystems?

• Microorganisms are too small to be seen without special equipment.

• Like all living things, microorganisms need water and energy.

• Millions of microorganisms can often be found in soil

• Microorganisms break down dead plants and animals, making nutrients available.

Some microorganisms are harmful when they enter other living things and cause the living things to __________.

• get sick

• grow quickly

• have babies

• produce energy

Organisms that live in the intestines of humans are helpful when they __________.

• block nutrients that humans need

• help break down food for humans to use

• secrete chemicals that cause disease

• enter the bloodstream of humans

Scientists discover a microorganism that lives on corn plants. They would like to know whether this microorganism is harmful to the corn plant. What kinds of data would be most helpful to collect for this investigation?

• The amount of corn produced in cornfields where this microorganism is present, and the amount produced in cornfields where it is absent

• The average lifespan of this microorganism and how it changes in different conditions

• The way in which this microorganism reproduces and ways to prevent it from producing offspring

Which of the following is written in order from smallest to largest?

• organ systems, organs, tissues, cells

• cells, tissues, organ systems, organs

• organs, tissues, cells, organ systems

• cells, tissues, organs, organ systems