Test Paper 1

Question 1

Spermatozoa structure

Answer 1

Flagellum

Acrosome

Question 2

Ova structure

Answer 2

Food stores

Zona pellucida

Question 3

Explain why gram positive and gram negative bacteria react differently with antibiotics

Answer 3

Some antibiotics can inhibit the formation of thick peptidogkycan cell all in gram positive bacteria. Some antibiotics are not able to cross the thick peptidoglycan cell wall therfore effective against gram negative

Question 4

Explain why some proteins may be soluble

Answer 4

Proteins is folded so that Hydrophobic parts are in the middle and Hydrophilic parts are on the outside these exposed r groups (globular protein) are polar therfore they form hydrogen bonds with water

Question 5

Advantages of mitosis

Answer 5

Does not require a mate

Can produce large numbers of offspring

Question 6

Advantages of meiosis

Answer 6

Source of genetic variation
As it involves crossing over and independent assortment
Genetic variation allows organisms to adapt to enviornemtnal change

Question 7

Why is stain used in light microscope when preparing tissues

Answer 7

Provides greater contrast

Stain attaches to specific parts of cell

Question 8

Explain why misfolded protein cannot be digested bu some protease enzymes

Answer 8

Protease enzyme have active site specific to certain amino acid sequences or substrate so misfolded protein can no longer fit and therfore enzyme cannot hydrolysed peptide bond

Question 9

Why are viruses dependant on living cells

Answer 9

Because they cannot replicate independlty as they contain enzymes

Question 10

Explain why information within a table can be insufficient when making conlusions

Answer 10

Doesn’t take into account how other factor affect it

Question 11

End products of double fertilisatoon

Answer 11

Tripled endosperm nucleus which is a source of nutrients for embryo