Question from campbell biology chapter 16:
51) what is the basis for the difference in how the leading and lagging strands of dna molecules are synthesized?
a) the origins of replication occur only at the 5' end.
b) helicases and single-strand binding proteins work at the 5' end.
c) dna polymerase can join new nucleotides only to the 3' end of a growing strand.
d) dna ligase works only in the 3' → 5' direction.
e) polymerase can work on only one strand at a time.

Are salt and soap nutrients or toxins for yeast? explain.

Imagine a rocket launching from earth and travelling to the moon. in which order would the rocket pass through the layers of the atmosphere? thermosphere, mesosphere, stratosphere, troposphere troposphere, mesosphere, stratosphere, troposphere thermosphere, stratosphere, mesosphere, troposphere troposphere, stratosphere, mesosphere, thermosphere

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.