WorksheetsZ10661 Intro to cell bio revision
Total questions: 26
Worksheet time: 17mins
Plasma membranes are selectively permeable. This means
anything can pass in and out
the membrane regulates the passage of the material in and out of the cell
glucose cannot enter the cell
cholesterol cannot enter
What model describes the arrangement of the cell membrane as a dynamic structure made of many components.
the fluid mosaic model
the major mobility model
the crazy cell model
the cell theroy model
Identify the cholesterol molecule
structure a
structure b
structure h
structure i
What type of protein is labeled A & B?
Peripheral proteins
Integral proteins
Glycoprotein
Cholesterol
What type of protein is labeled C?
Peripheral protein
Integral protein
Channel protein
Cholesterol
Which of the following allows water to move faster across cell membranes?
aquaporins
ATP
peripheral proteins
the sodium-potassium pump
Which organelle helps process and package proteins destined to be exported from the cell.
Ribosome
Golgi Reticulum
Endoplasmic Apparatus
Golgi Apparatus
Proteins are synthesised on ribosomes in the cell cytoplasm, and must be targeted to the appropriate compartment of the cell by sorting signal sequences. What is a signal sequence?
amino acid sequence located near the C-terminus (end) of the peptide chain that identifies eventual location of a protein
amino acid sequence located near the middle of the peptide chain that identifies eventual location of a protein
amino acid sequence located near the N-terminus (start) of the peptide chain that identifies eventual location of a protein
What is likely to be the fate of a protein that contains no such signal sequence?
remains in the cytoplasm
degraded immediately
is replicated
becomes an antibody
Proteins can be synthesised at the surface of the rough endoplasmic reticulum. What makes this endoplasmic reticulum "rough"?
It is spiked due to actin scaffolds
Antigens covering the surface
the folded nature of its structure
ribosomes bound to the surface
Proteins which enter the endoplasmic reticulum undergo several modifications before being passed to the Golgi apparatus via vesicles, where they can undergo further modification before being secreted from the cell. Which two answers are examples of post translational modifications?
polyadenylation, the adding of a poly-A tail
glycosylation, the adding of a carbohydrate group
phosphorylation, the adding of a phosphate group
Some proteins like digestive enzymes such as trypsin are released as inactive precursors. Trypsin digests proteins and is derived from the precursor trypsinogen produced in the pancreas. Why is it important that active trypsin is produced only after trypsinogen has left the pancreas?
To prevents digestion of cells and proteins in the pancreas
To ensure it reaches its destination intact
To avoid digesting food too early
Microtubules are made up of which of the following proteins?
Thrombin
Tubulin
Actin
Microtubules are not made up of a specific protein.
Which cellular structure gives mechanical support and shape to eukaryotic cells.
cell walls
cell membrane
cytoskeleton
cytoplasm
The cell cycle can be divided in to mitosis and interphase. Interphase has 3 distinct sub phases. What is the correct order for the phases of Interphase?
G1, S, G2
G1, G2, S
S, G1, G2
G2, S, G1
In which stage of the cell cycle do the nucleus and its contents divide?
synthesis
growth/gap 1
mitosis
growth/gap 2
When is apoptosis initiated?
When DNA damage is repaired.
When cells are removed from the cell cycle.
When DNA damage cannot be repaired.
