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TLS Online TPP Program

#Question id: 7296

some of the following statements regarding to this experiment are given below. Which of the following statements is incorrect?

#Unit 5. Developmental Biology

  1. If a small piece of tissue from a plant stem or leaf is placed on a solid agar medium containing the appropriate nutrients and growth hormones, the cells will start to divide to form a disorganized mass of cells known as a callus.

  2. If a small piece of tissue from a plant stem or leaf is placed on a solid agar medium, it does not need any nutrients and growth hormones, the cells will start to divide to form a disorganized mass of cells known as a callus.
  3. The callus cells are then separated and grown in liquid culture, again containing the appropriate growth hormones

  4. In suspension culture, some of the callus cells divide to form small cell clusters. These cell clusters can resemble the globular stage of a dicotyledon embryo, and with further culture on solid medium, develop through the heart shaped and later stages to regenerate a complete new plant.

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TLS Online TPP Program

#Question id: 1035

#Unit 4. Cell Communication and Cell Signaling

A new drug is developed that inhibits formation of the flagellar filament by impairing production of the protein flagellin. Is this going to be a good drug?
TLS Online TPP Program

#Question id: 23853

#Unit 13. Methods in Biology

The segment of DNA shown in Figure, has restriction sites I and II, which create restriction fragments A, B, and C. Which of the gels produced by electrophoresis shown below best represents the separation and identity of these fragments? 
TLS Online TPP Program

#Question id: 7209

#Unit 5. Developmental Biology

Following statements are related to the Epigenetic regulation of Hox gene expression in the chick limb .

A. Hoxa13 is normally not expressed during early limb bud outgrowth.

B. Hoxa13 is normally expressed during early limb bud outgrowth.

C. Inhibition of histone deacetylases with a TSA-coated bead implanted into the early limb bud results in precocious Hoxa13 expression and specifically reduced skeletal elements of the zeugopod

D. Inhibition of HAT proteins with a TSA-coated bead implanted into the early limb bud results in Hoxa13 expression and specifically reduced skeletal elements of the zeugopod

E. The epigenetic hold on gene Hoxa13 expression to allow the necessary time for zeugopod development.

F. The epigenetic hold on gene Hoxa13 expression to allow the necessary time for autopod development.

Which of the following combinations are correct?
TLS Online TPP Program

#Question id: 21954

#Unit 2. Cellular Organization

Interphase chromatin remain attached to nuclear wall proteins via 
TLS Online TPP Program

#Question id: 8712

#Unit 9. Diversity of Life Forms

The lakes of northern Minnesota are home to many similar species of damselflies of the genus Enallagma. These species have apparently undergone speciation from ancestral stock since the last glacial retreat about 10 thousand years ago. Sequencing which of the following would probably be most useful in sorting out evolutionary relationships among these closely related species?