[Maximum number: 1]
Which labelled structure on the electron micrograph below identifies this as a plant cell and not an animal cell?
[Maximum number: 1]
Which feature of striated muscle cells allows them to be considered as a possible exception to the cell theory?
A
They are found in multicellular organisms.
B
They contain more than one nucleus.
C
They are specialized for movement.
D
They do not carry out mitosis.
[Maximum number: 1]
The giant alga Acetabularia has a feature that suggests it is an exception to the cell theory. What feature is this?
A
It lacks a nucleus.
B
It lacks a cell wall.
C
It has only one mitochondrion.
D
It lacks subdivision into separate cells.
[Maximum number: 1]
Which structure found in eukaryotes has a single membrane?
A
Nucleus
B
Lysosome
C
Chloroplast
D
Mitochondrion
[Maximum number: 1]
Which function is accomplished by structures X and Y in the Paramecium?
[Maximum number: 1]
If cells of a multicellular organism have the same genes, how can there be many different cell types in a body?
A
Some genes but not others are expressed in each cell type.
B
Cells lose some genes as development occurs.
C
Genes do not determine the structure of a cell.
D
Cells must practice division of labour in order to survive.
[Maximum number: 1]
The image shows an electron micrograph of a fungus, Candida albicans.
Which terms identify the structures labelled I and II in the image?
I
II
cell membrane
vesicle
cell wall
chloroplast
plasma membrane
mitochondrion
cell wall
mitochondrion
[Maximum number: 1]
What feature of both striated muscle and aseptate fungal hyphae is different from typical cell structure?
A
They have multiple nuclei within a structural unit.
B
They have a cell wall that is not made of cellulose.
C
They have plasmids.
D
They have an absence of cholesterol in the plasma membrane.
[Maximum number: 1]
The magnification of the micrograph is .
What is the maximum diameter of the nucleus in the cell labelled X ?
A
B
10 nm
C
D
20 nm
[Maximum number: 1]
The electron micrograph shows a thin section through a plant mesophyll cell.
What is the magnification of the image?
A
B
C
D