Practice Questions

TLS Online TPP Program

#Question id: 23849

Which pathway regulates the contraction of vertebrate smooth muscle?

#Unit 2. Cellular Organization

When the Ca2+ level rises → Ca2+ binds CaM→ MLC kinase becomes inactive → dephosphorylates the myosin LC → unfolds the myosin II→ assemble into bipolar filaments for contraction.
When the Ca2+ level rises→Ca2+ binds CaM→activates MLC kinase→ phosphorylates the myosin LC→unfolds the myosin II → assemble into bipolar filaments for contraction.
When the Ca2+ returns to its resting level → Ca2+ binds CaM → activates MLC kinase→ phosphorylates the myosin LC → unfolds the myosin II→ causing muscle contraction.
When the Ca2+ level rises→ Ca2+ binds CaM→ activates MLC kinase → phosphorylates the myosin LC → myosin adopts a folded conformation→ assemble into bipolar filaments for contraction.

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TLS Online TPP Program

#Question id: 15385

#Unit 8. Inheritance Biology

You cross a true breeding normal corn plant with a true breeding plant with variegated seed coat and colorless endosperm. You suspect the genes are linked, so you cross one of the resulting normal offspring to a true breeding variegated, colorless plant. What are your expected results if the genes are completely linked?

TLS Online TPP Program

#Question id: 520

#Unit 1. Molecules and their Interaction Relevant to Biology

Enzymes that catalyze the same reaction are called ________.

TLS Online TPP Program

#Question id: 10887

#Unit 10. Ecological Principles

What is a linkage density of community A and B RESPECTIVELY?

TLS Online TPP Program

#Question id: 34177

#Unit 3. Fundamental Processes

Which of the following combination of the statements regarding polA mutants is correct

A. fail to join their Okazaki fragments

B. fail to removes the RNA primer

C. fail to removes the mismatch errors

D. fail to synthesis Okazaki fragments

TLS Online TPP Program

#Question id: 27587

#Unit 3. Fundamental Processes

Three major domains of DICER are