Nitric oxide (NO) is considered a paracrine signal molecule because it
a. is slow to diffuse.
b. is produced in very small quantities.
c. is unstable, with a short half-life.
d. binds to cell surface receptors that are very plentiful.
Ans: c. is unstable, with a short half-life.
You might also like to view...
The equation that describes the relationship between phenotypic variance, genetic variance and environmental variance is
A. VP = VG + VE B. 1 = VG + VE + VP C. VE = VG + VP D. VG = VP + VE
An episome is
A. a plasmid that can make bacterial cells resistant to antibiotics. B. a plasmid that gives bacteria the ability to degrade toluene. C. a plasmid that can exist either autonomously in the cytoplasm or as part of a chromosome. D. a plasmid that can turn a bacteria that is harmless into a strain that can cause disease. E. a plasmid that gives bacteria the ability to exchange DNA with another bacterial cell.
The first cells were
a. autotrophic. b. parasitic. c. anaerobic. d. aerobic. e. all of these.
The term clade most closely refers to:
a. a class. b. the binomial system of classification. c. a mechanism of horizontal gene transfer. d. a subspecies of organisms does not include a subgenus. e. a group of organisms that share common characteristics inherited from a common ancestor.