WorksheetsIB bio 1.1 Introduction to cells
Total questions: 13
Worksheet time: 11mins
Which of these are part of cell theory? (check all that apply)
All living things are made of cells
Cells carry out all of the functions of life
Cells only have one nucleus
The cell is the smallest unit of life
Cells come from pre-existing cells
The giant alga Acetabularia has a feature that suggests it is an exception to cell theory. What feature is this?
It lacks a nucleus
It lacks a cell wall
it has only one mitochondrion
It lacks subdivision into separate cells
When compared to other body cells, which characteristic of stem cells is the most important for therapeutic uses?
Less differentiated
Less excretion
Lower rate of reproduction
Lower rate of metabolism
What is likely to be the function of this adaptation of the plasma membrane?
Increases absorption by increasing the diffusion distance
Increases absorption by making surface area:volume ratio bigger
Increases absorption by making surface area:volume ratio smaller
Increases absorption by increasing the concentration gradient
If cells of all multicellular organism have the same genes, how can there be many different cell types in a body?
Some genes, but not others, are expressed in each cell type
Cells lose some genes as development occurs
Genes do not determine the structure of a cell
Cells must practice division of labour in order to survive
Multicellular organisms show emergent properties. What does this mean?
The whole is greater than the sum of its parts.
Cells of the same shape and function unite to form a tissue.
Multicellular organisms are made up of billions of cells.
The older a cell is the more different things it can do
What do we call the process where cells change to become specialised and carry out a specific function?
(a)
Which type of stem cell can differentiate into all body cell types, but cannot give rise to a whole organism?
Unipotent stem cells
Multipotent stem cells
Totipotent stem cells
Pluripotent stem cells
Stem cells retain the ability to do two things that most body cells can not. What are they?
(a)
Which graph represents the change in surface area to volume ratio with increasing cell diameter?
A form of deafness, caused by the loss of cochlear cells from the ear, is undergoing trials for embryonic stem cell treatment. Why are Embryonic stem cells used?
They are already specialised for this function
They are able to differentiate into the required cell type
They retain stem cell properties after specialisation.
There are no ethical issues concerning their use.
There are 7 signs of life. Which two are missing from this list? Reproduction, sensitivity, growth, excretion and nutrition.
(a)
Explain how the fertilised egg in the first picture has become the frog embryo in the final picture?
