Practice Questions

TLS Online TPP Program

#Question id: 4943

In what way were conditions on the early Earth of more than 3 billion years ago different from those on todayʹs Earth?

#Unit 11. Evolution and Behavior

only early Earth had water vapor in its atmosphere.
Only early Earth was intensely bombarded by large space debris.
Only early Earth had an oxidizing atmosphere.
Less ultraviolet radiation penetrated Earthʹs early atmosphere.

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TLS Online TPP Program

#Question id: 32379

#Unit 2. Cellular Organization

Soluble myosin II can be cleaved by gentle treatment with the protease chymotrypsin to yield following fragments. Which fragments have the activity?

TLS Online TPP Program

#Question id: 32380

#Unit 2. Cellular Organization

Which of the following protein consists almost entirely of a repeating 35-amino-acid actin-binding motif?

TLS Online TPP Program

#Question id: 32381

#Unit 2. Cellular Organization

What is the primary function of ATP hydrolysis in the myosin head?

TLS Online TPP Program

#Question id: 32382

#Unit 2. Cellular Organization

In which case the myosin head is firmly attached to 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: 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: