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TLS Online TPP Program

#Question id: 1972

Clonal selection implies that

#Unit 4. Cell Communication and Cell Signaling

  1. brothers and sisters have similar immune responses.

  2. antigens increase mitosis in specific lymphocytes.

  3. only certain cells can produce interferon.

  4. a B cell has multiple types of antigen receptors.

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TLS Online TPP Program

#Question id: 2724

#Unit 2. Cellular Organization

When DNA is compacted by histones into 10 nm and 30 nm fibers, the DNA is unable to interact with proteins required for gene expression. Therefore, to allow for these proteins to act, the chromatin must constantly alter its structure. Which processes contribute to this dynamic activity?
TLS Online TPP Program

#Question id: 11632

#Unit 8. Inheritance Biology

what is critical value(for 5%), When phenotype of plant species is 4?
TLS Online TPP Program

#Question id: 26561

#Unit 3. Fundamental Processes

In plants, miRNAs are generated by
TLS Online TPP Program

#Question id: 1305

#Unit 4. Cell Communication and Cell Signaling

Ions can travel directly from the cytoplasm of one animal cell to the cytoplasm of an adjacent cell through:
TLS Online TPP Program

#Question id: 14831

#Unit 2. Cellular Organization

A spirochete is a member of the phylum Spirochaetota, which contains distinctive diderm gram-negative bacteria, most of which have long, helically coiled cells. Movement of spirochetes occurs by means of structures called