It's my mid-term exam

Look at the photo of the leaf. which term best describes this leaf?

Amylase becomes denatured at a temperature of 80°c. during an experiment to study the effect of varyingtemperature on enzyme activity, amylase’s reactivity with starch was measured at body temperature (37°c), andthen again at an increased temperature of 42°c. how would this increase in temperature affect the experiment

Draw the structure of dna nucleotide with adenine as nitrogenous base