All of the living and nonliving things in an area that interact with each other are called a/an ______.

• community
• habitat
• population
• ecosystem

Provides support and protection for the cell, while also controlling the movement of materials in and out of the cell.

• Cellular Membrane
• Nucleus
• Ribosomes
• Vacuole

What type of transport is illustrated?

• facilitated diffusion
• active transport
• diffusion
• osmosis

Is the following cell diploid or haploid?

• Diploid

• Haploid

Structure B is pointing to the _____. 

• chromosome
• centromere
• DNA
• chromatid

Replicate the following strand of DNA: 
AATCATGGA

• AATCATGGA
• TTAGTACCT
• UUAGUACCU
• GGATAUCUA

Plant cells are able to produce their own food. This process happens in which structure?

• cell wall

• chloroplast

• mitochondrion

• vacuole

These diagrams show a variety of cells from the same organism.

How can cells from the same organism have such different shapes and functions?As each cell differentiates, the DNA changes so that each type of cell has different DNA once it reaches maturity.

• As each cell differentiates, the DNA changes so that each type of cell has different

• Mutations in the cells’ nuclei lead to new combinations of DNA, resulting in different shapes and functions in the different types of cells.

• During differentiation, different parts of the DNA in each type of cell are activated, resulting in the different structure and function of the cells.

• During differentiation, different types of cells produce proteins which destroy the nonactive DNA, leading to cell specialization.

Which statement best explains how sweating during exercise maintains homeostasis?

• It regulates mineral concentrations in cells

• It regulates body temperature

• It maintains water balance

• It maintains sugar balance in cells

The chemical colchicine disrupts cell division. Which cell process would most likely stop if colchicine were added to a culture of human liver cells?

• mitosis

• meiosis

• crossing over

• active transport