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TLS Online TPP Program

#Question id: 760

Which force can stabilize a DNA double-helix?

#1. Molecules and their Interaction Relevant to Biology

  1. Hydrophobic bases are found in the interior of the helix where each base pair is stabilized by the same number of hydrogen bonds.

  2. Hydrophilic sugar-phosphate groups are found on the exterior of the helix where they can interact with water.

  3. Non-covalent N-glycosidic bonds can form between nitrogenous bases in opposite strands in the helix.

  4. Covalent base-stacking interactions can occur between adjacent bases within the same strand in the helix.

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TLS Online TPP Program

#Question id: 9190

#9. Diversity of Life Forms

What is the probable role of salicylic acid in the defense responses of plants?
TLS Online TPP Program

#Question id: 342

#1. Molecules and their Interaction Relevant to Biology

In a single molecule of water, two hydrogen atoms are bonded to a single oxygen atom by ________.
TLS Online TPP Program

#Question id: 24189

#Aptitude

Every year, Americans use over one billion sharp objects to administer healthcare in their homes. These sharp objects include lancets, needles, and syringes. If not disposed of in puncture-resistant containers, they can injure sanitation workers. Sharp objects should be disposed of in hard plastic or metal containers with secure lids. The containers should be clearly marked and be puncture resistant.

The paragraph best supports the idea that sanitation workers can be injured if they
TLS Online TPP Program

#Question id: 1553

#4. Cell Communication and Cell Signaling

A protein antigen requires to be processed in order to make it
TLS Online TPP Program

#Question id: 15767

#5. Developmental Biology

A stem cell function in the organism to generate only one cell type is said to be