Memory Tc cells:.
a) are produced by the thousands, but they do not differentiate further the first time the antigen triggers an immune response.
b) immediately differentiate into helper T cells, producing a prompt, effective cellular response that can overwhelm an invading organism.
c) are highly mobile cells that roam throughout injured tissues.
d0 suppress the responses of other T cells and of B cells, and they limit the degree of immune system activation.

What would happen to the nutrients in an ecosystem if decomposers, such as bacteria, didn’t exist there?

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.

In iceland, the mid atlantic ridge runs through the center of the contry. what can you conclude about the apperence of iceland many thousands of years from now?