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.

Explanation is in the file

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before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.