The plant physiologist F. C. Steward demonstrated that:a
the preprophase band is important in plant cell division.
b. orchids can be generated from pollen grains.
c. an entire plant can be generated from a single callus cell.
d. the monopteros gene codes for a transcription factor.
e. the shoot apical meristem gives rise to leaf and bud primordia.
C
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Alleles are ____
a. sex chromosomes b. somatic cells c. crossover sites d. attachment sites for microtubules e. different versions of the same gene
CAM plants differ from C4 plants in that CAM plants ________ while C4 plants ________
a. none of the choices b. fix carbon in two separate chambers to keep CO2 high near rubisco / fix carbon mostly at night c. produce 3-carbon PGA as the first stable intermediate / produce 4-carbon oxaloacetate as the first stable intermediate d. open stomata and fix carbon using a C4 pathway at night / fix carbon first in mesophyll cells and again in bundle sheath cells
In seed plants,
a. xylem conveys sugar from the production site to the storage site. b. fertilization requires water. c. fertilization produces a zygote within the pollen sac. d. male gametophyte and female gametophyte develop independently. e. microspores enlarge to become megaspores.
Pheromones are
a. used in nonvocal communication. b. found only in the invertebrates. c. signals to members of other species. d. types of internal hormones that control maturation. e. involved only in learned behaviors.