Yes
The cells of eukaryotes will contain a nucleus.
Nuclei do not contain cells, cells contain nuclei (normally, one nucleus per cell).
Yes, plant cells contain a nucleus.
This theory is false. Red blood cells do not contain a nucleus.
Connective tissue is made of cells, and cells do not contain other cells (if they are healthy; bacterial infection would be an exception). Cells do contain structural elements that connect them to other cells, but that is not the same thing as connective tissue.
The nucleus
Yes, cartilage cells, also known as chondrocytes, do have a nucleus. Chondrocytes are the main cell type found in cartilage tissue and contain a nucleus where the genetic material is stored to carry out cellular functions.
No they don't. Eukaryotic cells are the ones that contain a nucleus. However, just because prokaryote cells don't contain a nucleus, they still contain DNA. It just floats freely in the cytoplasm.
Yes, animal cells - including octopus cells - contain a nucleus.
Prokaryotic cells lack a definite nucleus and membrane- bound organelles while eucaryotic cells have a definite nucleus.
No. Red blood cells (RBC) for example, do not contain a nucleus. Also, prokaryotes do not.
Animal and plant cells contain a nucleus. The nucleus is considered to be the 'brain' of a cell. This means that the nucleus will contain all the information the cell needs.