Use the drop-down menus to answer questions about bacteria. Since bacteria are prokaryotes, they have no
The outside of a bacterial cell is protected by a structure called a
.
The
provides a rigid structure that gives the cell its shape.
The
helps to transport ions, nutrients, and waste.

allow DNA to be transferred from one bacterium to another.

Iguanas need to live in a habitat that is very warm, so the pet store warms their enclosures with "basking lights" which act as an artificial sun. describe how the three methods of thermal energy transfer may take place within the iguana's enclosure.

Cold case files recently began re-investigating an old murder case. the murder took place in the park; a young man, james, was hit over the head with a brick and killed. police suspected the jealous former boyfriend of james' wife, karen. whoever killed james may have washed their hands in a near-by bird bath as detectives found blood in the bird bath. since the murder took place before dna fingerprinting was available, the suspected killer, ronnie, went free. detectives are now reviewing the blood evidence using dna fingerprinting. based on the dna fingerprints of all possible suspects, who is james' killer?

In this experiment, the was intentionally manipulated. it is the independent variable. the dependent variables that were measured were the