Phototropic and geotropic movements are linked to
(a) gibberellins
(b) enzymes
(c) auxin
(d) cytokinins
Phototropic and geotropic movements are linked to (a) gibberellins (b) enzymes (c) auxin (d) cytokinins
Question 1 Auxin transport Not yet answered Points out of 1.00 Flag question Select one: O a. Is polar, whereby auxin travels from shoot tips down the plant towards the roots. b. Produces a gradient of auxin required to establish organ formation and phototropic responses. c. Auxin is at highest concentrations, near its sources, like the apical meristems O d . Directionality of auxin movement (conferring polarity) is conferred by basally localized efflux carriers called PIN proteins e. All of...
How is auxin hormone transported? A. auxin is transported by diffusion only B. auxin is trasported by polar polar transport C. auxin is transported by phloem D. all of the above transport mechanisms are used to move auxin within the plant body
Which of the following is true about auxin: A. Auxin promotes lateral bud outgrowth B. Auxin inhibits lateral root formation C. There is only one kind of auxin found in nature D. Auxin inhibits abscission
1. What is the auxin concentration in subsets of c and d of the elongation zone if the rate of elongation in roots is 40% of maximal when there is no directional stimulus? 2. What is the auxin concentration in region a given the conditions listed to the left of the figure? (70% elongation of either a or b, but you decide which) 3.The % elongation of either elongation zone represented by a or by b is 70%. What is...
1.)When plants bend toward the light in response to auxin, the signal response includes… (a) only an intracellular response (b) only an intercellular response (c) both an intracellular and an intercellular response (d) magic 2.)The production of auxin is mediated by which wavelength of light? (a) blue (b) green (c) red (d) far-red 3.)Many plants are categorized as “short day” or “long day” plants. The environmental factor that determines the time of year when these plants flower is (a) a...
Which of the following hormones can stimulate growth of branches (=intiates growth and development of axillary buds)? A. cytokinins when apical meristem is removed B. ethylene C. strigolactone that encourages buds to grow D. auxin by using apical dominance
b. a. d. Non-protein enzymes tha catalysts b. helicases Bacterial enzymes that are present in van exoenzymes constitutive apoenzymes coenzymes enzymes that act on ribonucleic acid to remove non-coding areas are called ribozymes RNA polymerases coenzymes cytochromes
11. Bacteria can produce approximately _____________ different enzymes A. 250 B. 2,500 C. 25,000 D. 250,000 12. The first enzyme to be purified was A. an oxidoreductase B. a transferase C. a hydrolase D. a ligase 13. The scientist known for this first purification of an enzyme was A. Pasteur B. Sumner C. Lehninger D. Koshland 14. The initial step in enzyme catalysis requires A. a redistribution of electrons B. a transfer of protons C. recognition of substrate by the...
Starch polymers are broken down by enzymes into monomers called: a.)maltose b.) dextrins c.) glucose d.) sucrose
Adaptation is NOT: a. linked to survival b. adjustment to changing environmental conditions c. linked to reproductive success d. genetically determined e. increased in frequency by natural selection