TLS Online TPP Program

#Question id: 166


For amino acids with neutral R groups, at any pH below the pI of the amino acid, the population of amino acids in solution will have:

#Unit 1. Molecules and their Interaction Relevant to Biology
  1. a net negative charge.

  2. a net positive charge.

  3. no charged groups.

  4. no net charge.

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TLS Online TPP Program

#Question id: 9051

#Unit 9. Diversity of Life Forms

What would happen to the seasons if Earth were tilted 35 degrees off its orbital plane instead of the usual 23.5 degrees?

TLS Online TPP Program

#Question id: 4541

#Unit 3. Fundamental Processes

Mig1 recruits a “repressing complex” containing the Tup1 protein. This complex is recruited by many yeast DNA-binding proteins that repress transcription, including the alpha2 protein involved in controlling the mating-type specific. Tup1 also has counterparts in mammalian cells, choose correct mechanisms have been proposed to explain the repressing effect of Tup1.

I-Tup1 acts on nucleosomes either through recruiting histone deacetylases and/or by positioning a nucleosome at or near the transcription start site.

II-Tup1 interacts directly with the transcriptional machinery at the promoter and inhibits initiation.

TLS Online TPP Program

#Question id: 15389

#Unit 8. Inheritance Biology

Why is tetrad analysis useful for studying genetics?

TLS Online TPP Program

#Question id: 1813

#Unit 4. Cell Communication and Cell Signaling

The T-cells in male H-2b SCID mice bearing a transgenic αβ T-cell receptor gene specific for H–Y in association with H-2Db will:

TLS Online TPP Program

#Question id: 33524

#Unit 2. Cellular Organization

A. Only 1% of the human genome consists of exons.
B. The genes (exons plus introns) comprise 25% of the genome.
C. 60% of human genes are alternatively spliced.
D. Up to 80% of the alternative splices change protein sequence, so the human proteome has 50,000 to 60,000 members.

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