paper 1 mistakes

Question 1

define in terms of genetic code:
universal
non-overlapping
(2)

Answer 1

• the same codon always codes for same amino acids
• adjacent codons dont overlap

Question 2

state 2 roles of helper T cell (2)

Answer 2

• stimulate B cells
• stimulate cytotoxic T cells
• stimulate phagocytes

Question 3

define species richness and index of diversity (2)

Answer 3

• number of species in an area
• relationship between number of species and number of individuals in each species

Question 4

explain 2 reasons why glucose uptake by muscle cells increases significantly during exercise (4)

Answer 4

• increased respiration
• to provide more ATP for muscle contraction
• concentration gradient for glucose
• glucose enters by facilitated diffusion