BNFH01 - Cell Differentiation and Tissues

Why do cells with the same DNA look and function differently?

• Because they have mutations

• Because they express different genes

• Because they copy different DNA parts

• Because they live in different organs

What happens during differential gene expression?

• Cells delete unused genes

• Cells activate or silence specific genes to create their identity

• Cells change their DNA sequence

• Genes are copied into ribosomes

What is the main function of heterochromatin?

• To express many genes

• To synthesize proteins

• To keep DNA tightly packed and inactive

• To allow easy transcription

Which statement about stem cells is TRUE?

• They can self-renew and give rise to differentiated cells

• They cannot divide

• They are only found in embryos

• They contain different DNA

Which type of stem cell can form all body and extraembryonic tissues?

• Pluripotent

• Totipotent

• Multipotent

• Unipotent

'Determination' means that…

• The cell starts changing shape

• The cell’s fate is set and cannot change

• The cell divides faster

• The cell dies after division

Which combination is correct for connective tissue?

• Few cells, abundant extracellular matrix

• Many cells, no matrix

• Layers of tightly joined cells

• No ground substance

What is the role of fibroblasts?

• Immune defense

• Production of extracellular matrix

• Fat storage

• Blood transport

Which connective tissue type stores energy and provides insulation?

• Bone

• Cartilage

• Adipose tissue

• Dense regular tissue

Which characteristic best defines epithelial tissue?

• Densely packed cells with little extracellular space

• Cells scattered in a matrix

• Always vascular

• Made of muscle fibers