PREZYGOTIC isolating mechanisms ensure that: * no mating has occurred (sperm is not able to fertilize the egg)

hybrids are not fertile

hybrids are more likely to survive

genes do not mutate and affect the entire population

Many animals cannot sweat to maintain a stable body temperature. what is one other way animals can cool down?

Witch type of microscope is used to view very small cell components like proteins and dna?

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.