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TLS Online TPP Program

#Question id: 5029

Which of the following was the least likely factor causing the Cambrian explosion?

#Unit 11. Evolution and Behavior

  1. the emergence of predator-prey relationships between animals

  2. the accumulation of diverse adaptations, such as shells and different modes of locomotion

  3. the movement of animals onto land

  4. the evolution of Hox genes that controlled development

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TLS Online TPP Program

#Question id: 32383

#Unit 2. Cellular Organization

Which of the following state is very short-lived, in an actively contracting muscle?
TLS Online TPP Program

#Question id: 32384

#Unit 2. Cellular Organization

Weak binding of the myosin head to a new site on the actin filament causes release of the inorganic phosphate produced by ATP hydrolysis, concomitantly with the tight binding of the head to actin. This state known as:
TLS Online TPP Program

#Question id: 32385

#Unit 2. Cellular Organization

What is the correct sequence of the cycle of structural changes used by myosin II to walk along an actin filament?
TLS Online TPP Program

#Question id: 32386

#Unit 2. Cellular Organization

In which case the myosin head releases from the actin filament?
a. Presence of ATP
b. Absence of ATP
c. Presence of Ca2+
d. Absence of Ca2+
TLS Online TPP Program

#Question id: 32387

#Unit 2. Cellular Organization

During myosin movement along actin filaments, hydrolysis of ATP occurs, but the ADP and inorganic phosphate (Pi) remain tightly bound to the protein. This state known as:
TLS Online TPP Program

#Question id: 32388

#Unit 2. Cellular Organization

What is the role of troponin I in muscle contraction?