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TLS Online TPP Program

#Question id: 5220

In comparing the genomes of humans and those of other higher primates, it is seen that humans have a large metacentric pair we call chromosome #2 among our 46 chromosomes, while the other primates of this group have 48 chromosomes and any pair like the human #2 pair is not present; instead the primate groups each have two pairs of midsize acrocentric chromosomes. What is the most likely explanation?

#Unit 11. Evolution and Behavior

  1. The ancestral organism had 48 chromosomes and at some point a centric fusion event occurred and provided some selective advantage.

  2. The ancestral organism had 46 chromosomes, but primates evolved when one of the pairs broke in half.

  3. At some point in evolution, human ancestors and primate ancestors were able to mate and produce fertile offspring, making a new species.

  4. Chromosome breakage results in additional centromeres being made in order for meiosis to proceed successfully.

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TLS Online TPP Program

#Question id: 1629

#Unit 4. Cell Communication and Cell Signaling

Clonal selection occurs when antigen is encountered by:
TLS Online TPP Program

#Question id: 2780

#Unit 2. Cellular Organization

Which of the following pairs of proteins are considered to be paralogous?
TLS Online TPP Program

#Question id: 6983

#Unit 5. Developmental Biology

In vertebrates, the heart forms from:
TLS Online TPP Program

#Question id: 4440

#Unit 3. Fundamental Processes

Some more DNA-dependent RNA polymerases have been identified in recent years, These are found only in plants, where they transcribe small interfering RNAs involved in transcriptional silencing;
TLS Online TPP Program

#Question id: 657

#Unit 1. Molecules and their Interaction Relevant to Biology

Structural proteins that typically assemble into large cables or threads to provide mechanical support to cells or organisms are classified as ________ proteins.