In his studies of colonization of hard substrates by various subtidal invertebrates, Michael Keough found that, among isolated bare patches, __________ more successfully colonized the smaller patches.
A) the better competitors, tunicates and sponges,
B) the disturbance-adapted species, bryozoans and polychaetes,
C) the large predators, such as starfish,
D) microbial films, consisting of bacteria and fungi,
Ans: B) the disturbance-adapted species, bryozoans and polychaetes,
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Your patient was cut by a rusty nail. You vaccinate her for tetanus. How does one of her B cells produce antibodies against C. tetani?
A. Each antigen is coded for by a unique gene in the human genome; the correct gene is activated to produce the antigens against C. tetani. B. Recombination of different gene segments in B cells after exposure to C. tetani creates a unique structural gene. The cell then produces lots of that specific antibody. C. Post-translational modification of a generic antibody protein changes it from a generic form to the correct specialized form against C. tetani. D. Recombination of different gene segments in maturing B cells creates a unique structural gene. Upon exposure to C. tetani, the cell is stimulated to produce lots of the specific antibody expressed by that gene.
Answer the question using the accompanying figure. The structure labeled "7" is the ____
a. food vacuole b. gullet c. macronucleus d. micronucleus e. mitochondrion
Dark reactions: Fixation of Carbon Dioxide
What will be an ideal response?
The goal of ______________ technique is to minimized the contamination of both original and newly inoculated cultures as well as to protect the laboratory worker from contamination.
Fill in the blank(s) with the appropriate word(s).