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TLS Online TPP Program

#Question id: 807

Which of the following forces can stabilize a normal DNA double-helix?

#Unit 1. Molecules and their Interaction Relevant to Biology

  1. Base-stacking is a non-covalent interaction that occurs between the relatively hydrophobic bases in the interior of the helix.

  2. Base-pairing is a non-covalent interaction that occurs between adjacent bases in the same strand of the DNA molecule.

  3. The hydrophilic sugar-phosphate groups are on the exterior of the helix where they can interact with each other.

  4. The deoxyribose rings form N-glycosidic bonds with the phosphate groups that link neighboring nucleotides.

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TLS Online TPP Program

#Question id: 31149

#Unit 2. Cellular Organization

KDEL receptor and other membrane proteins that are transported Golgi to ER contain:
TLS Online TPP Program

#Question id: 11682

#Unit 7. System Physiology – Animal

A young woman is given daily injections of a substance beginning on the 16th day of her normal menstrual cycle and continuing for 3 weeks. As long as the injections continue, she does not menstruate. The injected substance could be which of the following?
TLS Online TPP Program

#Question id: 3009

#Unit 2. Cellular Organization

 Endospores are
TLS Online TPP Program

#Question id: 28835

#Unit 2. Cellular Organization

All microtubules are nucleated from structures known as microtubule-organizing centers, or MTOCs, select the correct prediction about MTOCs?
TLS Online TPP Program

#Question id: 18988

#Unit 13. Methods in Biology

which is used primarily for the identification of potential eukaryotic gene regulatory elements, such as promoters and enhancers.