Exam 27: Regulating Growth and Development: the Plant Hormones

Mutants of Arabidopsis that lack brassinosteroids have leaves that are smaller and have fewer cells than the wild-type.

A PIN protein:

Application of cytokinin inhibits the growth of lateral buds.

The receptors for both auxin and gibberellin are located in the:

If you cut the tip off a bean plant, the lateral buds will stop developing.

The climacteric is the phase in which fruits undergo a(n):

When tobacco pith callus is treated with higher concentrations of auxin than kinetin, ______ is(are) formed.

If a coleoptile tip is covered with a blackened glass tube then illuminated from the side, the coleoptile will:

Which of the following statements about ethylene is FALSE?

In roots, a substance transported in a basipetal direction is transported toward the root tip.

Expansins are proteins that disrupt hydrogen bonds between cell wall polysaccharides.

All plant hormones:

Jasmonic acid has a structure similar to aspirin.

A cortical cell and a mesophyll cell from the same plant most likely have different genes in their nuclei.

In the ethylene signaling pathway in Arabidopsis, when ethylene is absent, then ____ is active.

In isolated barley aleurone cells, treatment with GA causes the levels of α-amylase to ______, and treatment with ABA causes the levels to ______.

In the ABA-induced closing of stomata, the following ion fluxes occur across guard cell plasma membranes: first calcium ions flow ______, then anions flow ______, and finally potassium ions flow ______.

Dwarf mutant plants are short because they:

Folke Skoog and his colleagues found that ______ stimulated cells of tobacco to divide in culture.

Cytokinins are synthesized in ____ and transported from there to all other parts of the plant.