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TLS Online TPP Program

#Question id: 2635

In E. coli, deleting the ribosome binding site and region 1 of the trp attenuator and leaving the remainder of the attenuator intact has which of the following effects?

#Unit 2. Cellular Organization

  1. The attenuator structure will not form, and the structural genes will be transcribed.

  2. The attenuator structure will always form, and transcription will terminate.

  3. The frequency of attenuation will still be controlled by the concentration of trp-tRNAtrp.

  4. Translation of the structural genes will not occur.

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TLS Online TPP Program

#Question id: 7701

#Unit 9. Diversity of Life Forms

The various taxonomic levels (for example, phyla, genera, classes) of the hierarchical classification system differ from each other on the basis of ________
TLS Online TPP Program

#Question id: 7702

#Unit 9. Diversity of Life Forms

If organisms A, B, and C belong to the same class but to different orders and if organisms C, D, and E belong to the same order but to different families, which of the following pairs of organisms would be expected to show the greatest degree of structural homology?
TLS Online TPP Program

#Question id: 7703

#Unit 9. Diversity of Life Forms

Carolus Linnaeus believed that species remained fixed in the form in which they had been created. Linnaeus would have been uncomfortable with ________.
TLS Online TPP Program

#Question id: 7704

#Unit 9. Diversity of Life Forms

The best classification system is that which most closely ________.
TLS Online TPP Program

#Question id: 7705

#Unit 9. Diversity of Life Forms

 Based on this tree, which statement is correct?
TLS Online TPP Program

#Question id: 7751

#Unit 5. Developmental Biology

Ultrastructural studies have led to the characterization of two distinctive cytological
pathways of PCD in plants;
I) Vacuolar-type PCD
II) Hypersensitive response-type (HR-type) PCD
a) cytosol and all its organelles, including the plasma membrane, are completely brokendown
b) The vacuole loses water, resulting in marked cell shrinkage, contraction from the cell wall,
and nuclear DNA degradation
c) PCD occurs in leaves in response to microbial attack
d) cell wall is either partially or completely digested as well, as in endosperm tissue
e) Continued water loss from the cytosol leads to the breakdown of the plasma membrane
and the release of residual cellular contents into the apoplast
Given characterization of PCD pathway match with its type PCD?