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#Question id: 5122

In amphibia, when epidermal (ectodermal) and mesodermal cells are brought together in a mixed aggregate, the epidermal cells move to the periphery of the aggregate, and the mesodermal cells move to the inside by the process of selective affinity. Which of the following statement describe the phenomena of selective affinity?

#SCPH01 Biochemistry

  1. The inner surface of the ectoderm has a positive affinity for mesodermal cells and a negative affinity for the endoderm, whereas the mesoderm has positive affinities for both ectodermal and endodermal cells.

  2. The inner surface of the ectoderm has a negative affinity for mesodermal cells and a positive affinity for the endoderm, whereas the mesoderm has negative affinities for both ectodermal and endodermal cells.

  3. The inner surface of the ectoderm has a positive affinity for mesodermal cells and a positive affinity for the endoderm, whereas the mesoderm has positive affinities for both ectodermal and endodermal cells.

  4. The inner surface of the ectoderm has a negative affinity for mesodermal cells and a negative affinity for the endoderm, whereas the mesoderm has negative affinities for both ectodermal and endodermal cells

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TLS Online TPP Program

#Question id: 3626

#SCPH12 I Genetics

The major blood group locus in humans produces types A (genotypes AA or AO), B (genotypes BB or BO), AB (genotype AB), or O (genotype OO). Parents who are type AB and type O, what are the possible blood types of their offspring?
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#Question id: 3856

#SCPH05 I Biotechnology

In eukaryotes, the conserved element closest to the transcription start site is called the:
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#Question id: 8930

#I Life Science/ Life Sciences Group – I-V

Soon after the coelom begins to form, a researcher injects a dye into the coelom of a deuterostome embryo. Initially, the dye should be able to flow directly into the
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#Question id: 3615

#SCPH12 I Genetics

What are alleles?
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#Question id: 1567

#SCPH05 I Biotechnology

Which of the following cell types are responsible for initiating a secondary immune response?