BICD 120 Midterm 1 Review Session

Which of these is NOT a characteristic of phytohormones?

• They are small molecules (not proteins)

• They work at low concentrations

• They have a high Kd for their receptor

• They are specific for their receptor

Which of these is true about signaling?

• In autocrine signaling, a cell targets a nearby cell

• Signaling is often fast when it involves transcription/translation

• In a MAP kinase cascade, MAP2Ks phosphorylate MAPKs

• Hormones must be made in the same cell that they are used

What is dichogamy?

• stamens and pistils mature are different times

• flowers have different morphs

• S-locus genes determine pollen-stigma compatability

• when a plant is monoecious (male and female flowers are on the same plant)

Which of these is true for sporophytic self-incompatibility?

• S-locus receptor kinase (SRK) is the pollen S-determinant, and S-locus cysteine rich protein (SCR) is the stigma's

• Each SRK recognizes and binds SCR ligands of the same haplotype

• Binding of SCR to SRK promotes pollen germination

• When an S1 pollen lands on an S1S2 stigma, pollen germination will occur

Once the pollen tube reaches the entrance of the ovule (micropyle), the pollen tube enters

• one of the synergid cells

• the egg cell

• the central cell

• both the egg and central cell

Which of these is false about periclinal divisions?

• They are perpendicular to the radial axis

• They increase the # of cells in a single layer

• They are critical for radial patterning

• They generate the vascular tissues, ground tissues, and epidermis

Which of these would you NOT expect with a pin1 loss-of-function mutant?

• polar auxin transport

• defects in embryonic development

• the apical cell and basal cell in the 2-cell embryo having an equal distribution of auxin

• equal distribution of GFP in a DR5::GFP plant embryo

Which of these is true about the GNOM (GN) gene in plants?

• It codes for PIN proteins (auxin efflux carrier proteins)

• It is essential for proper localization of PIN proteins

• It encodes Auxin Responsive transcription Factors (ARFs)

• It controls a root hair inhibitory pathway

monopteros (mp) mutants lack apical elements (eg. stems and leaves) but basal elements (eg. roots) are still developed

• True

• False

Which of these is a not a fundamental zone of the root?

• Meristematic

• Elongation

• Determination

• Differentiation