Division and differentiation in human cells

• plasma membrane- selectively permeable, controls entry + exit of substances
• cytoplasm- fluid containing proteins, fats, oils and sugars, site of chemical reactions
• nucleus- controls cellular activities, contains DNA, blueprint for manufacture of protein
• nuclear membrane- membrane made of fats + protein, surrounds nucleus
• pore in nuclear membrane- allows mRNA to exit nucleus
• mitochondria- site of aerobic respiration, energy released during breakdown of glucose
• ribosome- site of protein synthesis, found of endoplasmic reticulum and in cytoplasm
• lysosome- contains enzymes, digest unwanted materials and the cell on death
• In a developing embryo, tissues such as muscle

  and nerve are produced by?

  C. somatic cells dividing by mitosis
• Which of the following is most likely to identify correctly cell types P and Q?

  B

  
• In a developing embryo, tissues such as muscle

  and nerve are produced by

  somatic cells dividing by mitosis
• the nucleus is the site of mRNA synthesis and controls cell activities and contains DNA
• mitochondria is the site of aerobic respiration
• ribosomes are the site of protein synthesis
• plasma membrane controls the movement of materials into and out of the cell
• the nuclear membrane is composed of fats and protein which surrounds the nucleus
• pore in the nuclear membrane is a hole in the nuclear membrane which allows mRNA to exit the nucleus
• ribosome is found on structures called the endoplasmic reticulum and in the cytoplasm
• lysosomes contain enzymes which digest unwanted material and the cell itself on death
• Describe what happens during differentiation.

  Cells become specialised/are given specific functions OR Genes are being expressed.