Two students suggested that the wallflower cannot produce fruit unless pollination has taken place. Their
teacher showed them how to prevent bees reaching
the flowers by covering the flowers in a fine mesh bag,
and how to transfer pollen with a fine paintbrush.
a Describe how the students could carry out an
experiment to test their hypothesis
b Suggest how they could modify their experiment to
test whether self- or cross-pollination produced
more seeds in the wallflower
In your answer be sure to describe any controls which
they could include, and any steps they could take to
ensure that their results were valid

Neelaredoxin is a 15-kda protein that is a gene product common in anaerobic prokaryotes. it has superoxide-scavenging activity, and it is constitutively expressed. in addition, its expression is not further induced during its exposure to o2 or h2o2 (silva, g., et al. 2001. j. bacteriol. 183: 4413–4420). which of the following statements best describes neelaredoxin synthesis? a-neelaredoxin is produced at all times; levels are constant even when exposed to o2 or h2o2.b-neelaredoxin is produced at all times; exposure to o2 or h2o2 increases expression.c-neelaredoxin is produced at all times; exposure to o2 or h2o2 decreases or prevents expression.d-neelaredoxin is only produced when there is exposure to o2 or h2o2.

Contrast how pollination is different among gymnosperms and angiosperms.

20 the compound al(nh3)2 has atoms of nitrogen.