1. Place a check mark next to each cellular structure necessary to build a bacterial cell. plasma membrane

cell wall

DNA

nucleus

mitochondria

chloroplast

Golgi apparatus

smooth endoplasmic reticulum

rough endoplasmic reticulum

nucleoid

Animal bodies (and even plant bodies for that matter) are complex enough that life couldn't exist without enzymes. enzymes are usually large, complex biological catalysts that are expensive to make. enzymes speed up the rate of chemical reactions without being used up during the reaction (they can be reused many times). they are highly specific in the reactions they regulate. knowing what enzymes are and how they function, why does this explain why complex life forms could not exist if there were no enzymes.

Connection compare and contrast genetic engineering to the process of natural selection. select all statements that are true.

What is a group of organisms that are closely related and share similar characteristics