2nd Three Weeks Test Review

If a cell is placed in salt water, water leaves the cell by _____.

• diffusion

• osmosis

• active trasnport

• phagocytosis

The simplest grouping of more than one kind of organism in the biosphere is

• a community

• a population

• a species

• an ecosystem

The cell membrane serves a

• boundary from the cells environment

• powerhouse for the cell

• sugar producer

• vesicle to move supplies to different parts of the cell

The instructions for making virus copies are

• found in bacteriophages

• coded in surface proteins attached to the protein coat

• coded in DNA or RNA

• built into the capsid of the virus

Select all the forms of passive transport.

• osmosis

• facilitated diffusion

• simple diffusion

• endocytosis

Viruses are composed of _____________________________. Choose all that apply.

• capsids

• nucleic acids

• membranes

• both DNA and RNA

An ecological pyramid of numbers displays

• the amount of energy at a specific trophic level.

• the number of individual organisms at each trophic level.

• the amount of biomass at each trophic level.

• the amount of decomposers at each trophic level.

Lytic viruses

• remain dormant for years.

• lyse the host cell right away.

• do not infect host cells

• are beneficial to the cells they infect.

The capsid protects the genetic material of the virus and allows the virus to

• attach to a host cell.

• destroy a host cell.

• make copies of DNA or RNA.

• transcribe and tranlate viral genes.

A cell moves particles from a region of lesser concentration to a region of greater concentration by _____.

• osmosis

• passive transport

• active transport

• facilitated diffusion