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.

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

The first cells were

a. autotrophic. b. parasitic. c. anaerobic. d. aerobic. e. all of these.

Biology & Microbiology

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.

Biology & Microbiology