Cell Specialization
What is a fundamental difference between the cells of multicellular organisms and cells of unicellular organisms?
Cells of multicellular organisms can specialize.
What term describes a chemical signal in the body that may help trigger cellular specialization in previously undifferentiated cells?
Hormone
Why is it necessary for cells in multicellular organisms to control what genes are expressed in each specialized tissue?
If all cells expressed all genes, they could not specialize into tissues.
Which example best shows how different have specialized functions?
In a plant, xylem cells transport water, and phloem cells transport food.
Which statement explains how cell differentiation helps to increase the complexity in living organisms?
It helps in the formation of cells with specialized structure and function.
Which type of tissue is composed of cells that conduct electrical impulses?
Nervous
What causes cell differentiation?
Only specific parts of the DNA are activated.
WHich statement best distinguesed stem cells from other body cells?
Stem cells are unspecialized cells that are able to differentiate into various cell types.
Cells in the pancreas make starch-digesting proteins, but cells in bone marrow do not. How do the cells know what enzymes too form?
The cells have different chromosomes and code for different enzymes.
Which of these determines whether a fertilized egg develops into a toad, a snake, or lizard?
The genes of the egg
Cord blood taken from an infant's umbilical cord contains stem cells. When preserved,, the stem cells can be used later for treatment of many diseases that the person might suffer. Which statement is true about umbillical sord stem cells?
They have the ability to develop into other types of cells.
Which statement is true about the levels of organization in a multicellular organism?
Tissues are composed of the same type of cells that perform a particular function.
When does cellular differentiation begin in an organism
after several divisions of the fertilized egg
If cell division produces more and more identical cells, what explains how specialized cells such as blood cells, muscle cells, and nerve cells form?
cell differentiation
Some plant cells are coated in a waxy layer that prevents water loss. This specialized is found in which plant cells?
cells on the plant surface
Which of the following allows a cell to become specialized?
different patters of gene expression
Which type of tissue is most likely to have cells with the highest concentration of mitochondria
muscle
Myopia is a condition in which close objects are seen clearly, but objects at a distance appear blurred. It occurs if the eyeball is too long. Which level of cellular organization is affected by myopia?
organ
Which series shows the levels of organization for an organism from the least to the most complex?
organelles cells tissues organs systems