Stomata generally open in response to ____
a. the release of abscisic acid by the roots
b. a drop in CO2 concentration in leaf air spaces
c. exposure to red light
d. a drop in O2 concentration in leaf air spaces
e. an increase in CO2 concentration in the leaf air spaces
ANSWER: b
You might also like to view...
The bacterial species that can be described as able to grow in 6.5% sodium chloride (NaCl) and 40% bile, is part of the normal fecal flora of animals and humans, displays hemolysis, and is a major cause of nosocomial infections is:
a. E. faecalis. b. S. pneumoniae. c. S. pyogenes. d. S. agalactiae.
The pre-mRNA transcript of mammalian ?-tropomyosin undergoes ____ to produce different mRNAs in smooth and
striated muscles.
a. aminoacylation b. alternative splicing c. polyadenylation d. degeneracy e. exon shuffling
The organisms of the intertidal are subject to daily changes in all except:
a. exposure to air. b. desiccation. c. wind and waves. d. low light levels. e. heat.
Interpreting the coefficients on fixed effects will always be based on what?
A. The sign of the coefficient on the instrumental variable in the first stage regression. B. The standard error on the treatment variable. C. The base group omitted from the regression. D. If the regression was run using STATA or Excel.