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The movement of materials across a selectively permeable membrane involving the expenditure of cellular energy is

In this transport process, the energy from hydrolysis of ATP is used to drive substances across the membrane against their own concentration gradient.

What is the principal function of ribosomes?

The attraction that exists between positively and negatively charged ions is called a(n)

The advantage of the presence of microvilli on cell membranes is:

During the process of translation, the code carried by mRNA is:

The buildup of larger molecules from smaller ones is called

Digestive enzymes destroy phagocytized bacteria. These enzymes are stored in tiny sacs bounded with a single membrane. These sacs are called

This process is division of the cytoplasm.

Enzymes and antibodies are examples of