questions I got wrong in exams Flashcards
why is the nutrient store in the litter layer of the taiga greater than in the tropical rainforest
taiga has lower temperature and lower rainfall comapred to rainforest, meaning rate of decomposition is slowed down, so bigger layer of litter
decompostion returns nutrients to soil, bigger rate of decomposition means less nutrients in the litter
more decomposers in the tropical rainforest
outline how a reliable estimate of the population of an animal species can be obtained using the capture mark release recapture technique
sufficiently large sample size
appropriate time intervals between capture and recapture
marking must not be harmful
descibre the exchange of materials between the corals polyps and zooxanthellae
polyp is a source of co2 for the zooanxalthae while zooanxalthae provides oxygen for coral
state one limiting factor on zooxanthellae which affects coral reef formation
light or temp or ph or co2
outline how chi squared can be used to test for an association between the distributions of the two species
in each quadrant determine the presence of plants of each species
null hypothesis is that the presence of one is random in presence of other plant
xˆ2= sum of (o-e)ˆ2/e
accept alternative hypothesis if difference between observed and expected is statistically significant
2 advantages of exsitu conservation
education
lower maintainence
protect endangered species
is energy storage a primary function of a protein molecule
no
what is the reason for the infinite diversity of peptide chains
the order number and diversity of the 20 amino acids
in which location of the cell membrane are the carbs from glycoproteins found
connected to proteins at the extracellular side of the membrane
what is the difference between cohesion and adhesion
only cohesion is involved in the movement of water in soil
what are examples of conjugated proteins
glycoprotein and haemoglobin
what is the most accurate definition of water potential
potential energy of water per unit volume
describe how pancreatic cells directly affect blood glucose levels
- blood glucose levels high- beta cells in pancreas secrete insulin which;
-increases uptake of glucose by all body cells by opening glut channel
-condenses glucose onto glycogen stored in liver and muscles
-reduces blood glucose levels
-negative feedback mechanism
-hypothalamus does not have role in blood glucoregulation
explain how hydrophobic and hydrophilic properties contribute to the arrangement of molecules in a membrane
-membrane made of phospholipid bilayer
-has polar head (hydrophilic) and non polar fatty acid tail (hydrophobic)
-when put in water spontaneously form phopholipid bilayer, polar head face outwards
-fatty acid tails point inwards
-some amino acids are hydrophilic and some are hydrophobic
-integral proteins embedded in membranes due to hydrophobic properties
-hydrophilic attracted to water while hydrophobic not attracted
-cholesterol mainly hydrophobic located amongst phospholipids
function of PCT
where selective reabsorption occurs
