Practice Exam Questions Flashcards
A typical prokaryotic cell has;
- nucleic acid
Not membrane bound, a substance
Biological polymers include;
- cellulose composed of glucose
A polysaccharide that can be made is some animal cells is;
- glycogen
What’s a way a nucleotide can be identified as a monomer of DNA but not RNA
- DNA contains thymine
- RNA contains uracil
Chloroplasts; A) contain glycogen B) are found in all plant cells C) are found in some bacterial cells D) contain layers of internal membranes
- D
Only plants cells which function in photosynthesis contain chloroplasts
Plants growing in soul with low levels of nitrogen may be unable to produce sufficient molecules of;
- ribonucleic acids
Starch is a polysaccharide. Other polysaccharides synthesised by organisms include; A) lactose B) sucrose C) glucose D) glycogen
- D
The plasma membrane of a cell
A) is flexible due to the presence of protein molecules
B) allows substances to pass through only by active transport
C) contains cholesterol molecules which can act as cell receptors
D) is relatively impermeable to larger water- soluble molecules due to the presence of the bilipid layer
Is relatively impermeable to large water soluble molecules due to the presence of the bilious later
Animal cells placed in distilled water swell and burst. Plant cells place in distilled water do not burst.
Explain why plant cells do not burst in this situation;
Because plant cells have a cell wall which provides extra structure and prevents the cell from bursting.
Explain why the secondary structure may be important in the function of a particular protein
A pleated sheet structure of a protein would structure the overall shape as well as making the shape more specific, which would be required for proteins such as enzymes.
A prokaryotic cell contains;
- ribosome
Not a membrane bound organelle
Explain how the chemical composition of structure A (phospholipid bilayer) facilitates its role;
Phosphate end is hydrophilic while fatty acid tails are hydrophobic. As a result the molecules line up with the phosphate ends of the other layer in the cytosol, forming a barrier.
