The primary photosynthetic pigment molecule, chlorophyll a, is an orange pigment.
a. true
b. false
b. false
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Which tissue can NOT divide to give rise to identical progeny in a plant that reproduces asexually?
A. root B. stem C. leaf D. pollen grain E. ovule
Some hemicellulose will contain ____,which consists of a backbone of â-1, 4-glucose molecules to which side chains
of five-carbon sugar are attached. a. cellulose b. xyloglucan c. lignin d. ?-galacturonic acid e. pectin
Nitric oxide is a signal molecule that can
a. bind to surface receptors and activate second messengers. b. bind to surface receptors and open ion channels. c. diffuse across cell membranes and bind to receptors that regulate transcription. d. diffuse across cell membranes and directly alter the activity of intracellular enzymes.
Which of the following represents the collective forces that move water upward in xylem?
a) root pressure b) gravity c) transpiration d) active transport e) translocation