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TLS Online TPP Program

#Question id: 2167

Polarized cells in animals

#Unit 2. Cellular Organization

  1. are a general feature of epithelial tissue, which lines body cavities.

  2. include erythrocytes and most other blood cells.

  3. have the same protein molecules exposed on their apical and basolateral surfaces.

  4. may be sealed together by plasmodesmata to form a barrier to the passage of most small molecules.

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TLS Online TPP Program

#Question id: 15216

#Unit 13. Methods in Biology

There is no SDS in native (Buffer) Gels, but good resolution is achieved due to
TLS Online TPP Program

#Question id: 11438

#Unit 1. Molecules and their Interaction Relevant to Biology

Two of the common amino acids are analyzed. At pH = 7.0, amino acid X is negatively charged while amino acid Y is positively charged. Which will be a characteristic of amino acid X?
TLS Online TPP Program

#Question id: 375

#Unit 1. Molecules and their Interaction Relevant to Biology

The aqueous solution with the lowest pH is:
TLS Online TPP Program

#Question id: 7099

#Unit 5. Developmental Biology

A fate map of a Xenopus blastula, just before gastrulation begins, shows that the top portion of the embryo will become ectoderm (skin and nerve), the central portion will become mesoderm (bone, muscle, and blood), and the lowest portion will become endoderm (gut). How is it that the endoderm and mesoderm, shown on the outside in the fate map, end up on the inside in the embryo after gastrulation?
TLS Online TPP Program

#Question id: 4522

#Unit 3. Fundamental Processes

Gal4p contains a