While culturing some cells, you lower the temperature of the culture. What happens immediately to the membrane fluidity?
a) the membrane fluidity fluctuates back and forth from high to low
b) nothing happens
c) the membrane fluidity fluctuates back and forth from low to high
d) the membrane becomes less fluid
e) the membrane becomes more fluid
Answer: d) the membrane becomes less fluid
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A. oogonium B. zygote C. primary oocyte D. ovum E. spermatogonium
The concentration of the primary messenger (ligand) in the bloodstream changes from <10?9 M when the signal is not being secreted to 10?7 M when it is being secreted
Which of the following Kds for binding that ligand would be optimal for a receptor involved in a responsive signaling system? A) 10?10 B) 10?9 C) 10?8 D) 10?7 E) 10?6
When a segment of DNA duplicates, causing two copies of a gene to be present in the chromosome, the duplicate copy could possibly (Check all that apply)
A. gain a new function due to mutation. B. become a centromere. C. become a pseudogene. D. lose function due to mutation. E. become an ortholog.
Freshwater flatworms have this type of system for osmoregulation.
A. isonephridial B. eunephridial C. protonephridial D. osmonephridial E. metanephridial