One of the primary differences between plant cells and animal cells is that plant cells must be able to undergo photosynthesis. Photosynthesis takes place in the chloroplasts, which contain the pigment chlorophyll. Chloroplasts are not found in animal cells, but are found in plant cells.

Both animal and plant cells contain Golgi bodies, smooth endoplasmic reticulum, and mitochondria.

Mitochondria are the only organelle defined correctly. The main processes of cell respiration, namely the electron transport chain, occur in the mitochondria to produce energy in the form of ATP. Because of this, mitochondria are known as the "powerhouses" of the cell.

Ribosomes are responsible for transcribing RNA and creating new proteins. The Golgi body packages proteins into vesicles that can be transported out of the cell. Lysosomes contain enzymes that can digest old or damaged proteins. The smooth endoplasmic reticulum is responsible for synthesizing lipids and for degrading toxins, such as alcohol.

Ribosomes are composed of a unique type of RNA, rRNA, and are located within the cytoplasm of the cell and on the surface of the rough endoplasmic reticulum. Here, proteins are assembled from amino acids piece by piece using instructions copied from DNA.

The mitochondria are organelles that are often referred to as the "power plant" of the cell. Mitochondria are responsible for extracting energy from food molecules and binding it in the high energy bonds of the ATP molecule.  

The Golgi apparatus can be thought of as the "shipping center" of the cell. Here, proteins and other materials are packaged in vesicles which are transported to other sites in the cell or outside the cell membrane for "export".  

The chloroplast is unique to plant cells (and some bacteria and protists), and is the site of photosynthesis. Almost all energy used by life is captured by this organelle. All other answers listed can be found in both plant and animal cells.  

Nonmembranous organelles are always in contact with cytosol.

Membranous organelles are surrounded by membranes that isolate their contents from the cytosol.

Ribosomes are freely scattered in the cytoplasm and thus are nonmembranous organelles.

One of the functions of the endoplasmic reticulum is to secrete proteins.

It's other functions include: synthesis of secretory products, intracellular storage, transport, and calcium ion storage.

Mitochondria are organelles that have an unusual double membrane. An out membrane surround the entire organelle, and a second, inner membrane contains numerous folds, called cristae. Cristae increase the surface area exposes to the matrix of mitochondria.

The plasmalemma (plasma membrane) has a complex structure composed of phospholipids, proteins, glycolipids, and cholesterol. The phospholipids form two distinct layers that don't allow dissolved ions and water-soluble compounds to cross the plasmalemma. This makes the plasmalemma effective in isolating the cytoplasm from the surrounding fluid environment.