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TLS Online TPP Program

#Question id: 7144

Heart development begins as

#Unit 5. Developmental Biology
  1. a folding process in the mesoderm below the notochord that is exactly like neural tube formation.
  2. an outgrowth of the endoderm above the gut that forms a tube that will become the heart.
  3. a pair of tubes in the lateral plate mesoderm that move together and fuse to form a single tube that will become the heart.
  4. a mesenchymal condensation below the notochord that forms the heart tube.
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TLS Online TPP Program

#Question id: 3829

#Unit 3. Fundamental Processes

Why is only one copy of DNA made per cell division cycle in eukaryotes despite the presence of multiple origins of replication?
TLS Online TPP Program

#Question id: 1614

#Unit 4. Cell Communication and Cell Signaling

The membrane attack complex consists of:
TLS Online TPP Program

#Question id: 32430

#Unit 2. Cellular Organization

Muscle contraction depends on two processes: 
a. Filament sliding, driven by the ATPase domain of myosin 
b. Ca2+ pumping, driven by the Ca2+-pump
c. Filament sliding, driven by the ATPase domain of actin
d. Na+ pumping, driven by the Na+- K+ pump
TLS Online TPP Program

#Question id: 11317

#Unit 10. Ecological Principles

Which of the following phenomena emphasizes the indirect effects of consumer-resource interactions extended through additional trophic levels of the community?
TLS Online TPP Program

#Question id: 492

#Unit 1. Molecules and their Interaction Relevant to Biology

In humans, gluconeogenesis: