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TLS Online TPP Program

#Question id: 10919

Both of these observations—________X__________and________Y__________—support the existence of mass flow in the sieve elements of the phloem.

#Unit 6. System Physiology – Plant
  1. X- retrieve any sugars lost to the apoplast by leakage, and  Y- perhaps to reload sugars at the termination of sieve tubes
  2. X-the lack of bidirectional transport in a single sieve element and,  Y- similar velocities for solutes and water
  3. X-positive pressure gradient and,   Y- turgor pressure higher in sieve elements of sources than to sink 
  4. X-the bidirectional transport in a single sieve element and,   Y- different velocities for solutes and water
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TLS Online TPP Program

#Question id: 12969

#Unit 10. Ecological Principles

In which of the following habitats would one expect to find the highest diversity of vascular plants? 
TLS Online TPP Program

#Question id: 5704

#Unit 8. Inheritance Biology

What kind of pairing configuration would be seen in prophase of meiosis I in (a) an inversion homozygous, (b) a translocation heterozygote?
TLS Online TPP Program

#Question id: 5320

#Unit 11. Evolution and Behavior

Which of the following types of genes or gene families may be created by mutations that occur in one member of a gene pair that arose from gene duplication:?
TLS Online TPP Program

#Question id: 22941

#Unit 5. Developmental Biology

The ER-localized protein, which is required for FT movement into the phloem translocation stream is
TLS Online TPP Program

#Question id: 112

#Unit 1. Molecules and their Interaction Relevant to Biology

The major groups of lipids can be separated by silicic acid column chromatography by eluting with