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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: 13213

#Unit 6. System Physiology – Plant

The cuticle covering the leaf is nearly impermeable to water, then how do most leaf transpiration
TLS Online TPP Program

#Question id: 5330

#Unit 8. Inheritance Biology

First child of both affected couple has normal, an autosomal dominant disorder. What is probability of second child of this couple would have diseased?
TLS Online TPP Program

#Question id: 5806

#Unit 8. Inheritance Biology

Which of these is NOT a mechanism by which a chromosome rearrangement could affect gene function?
TLS Online TPP Program

#Question id: 2902

#Unit 2. Cellular Organization

The function and positioning of the histone variants can be studied by an application of technologies used in genomics. One useful technology is chromatin immunoprecipitation, or chromatin IP (ChIP). The correct sequence of the processes that occur in this experiment will be?

1. A histone variant with an epitope tag is introduced into a particular cell type, where it is incorporated into nucleosomes.

2. The pattern of hybridization on the microarray reveals the DNA sequences bound by the nucleosomes with the histone variant.

3. Antibody is added, and the nucleosomes containing the epitope-tagged histone variant are selectively precipitated.

4. Chromatin is isolated from the cells and digested briefly with micrococcal nuclease (MNase).

5. The DNA in these nucleosomes is extracted from the precipitate, labeled, and used to probe a microarray representing all or part of the genomic sequences of that particular cell type.
TLS Online TPP Program

#Question id: 15956

#Unit 12. Applied Biology

Transplantation of foreign chloroplasts into crop plants with inefficient photosynthetic system applied by