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TLS Online TPP Program

#Question id: 11003

Which of the following statements about cardiac muscle is most accurate?

#Unit 7. System Physiology – Animal
  1. The T-tubules of cardiac muscle can store much less calcium than T-tubules in skeletal muscle
  2. The strength and contraction of cardiac muscle depends on the amount of calcium surrounding cardiac myocytes
  3. In cardiac muscle the initiation of the action potential causes an immediate opening of slow calcium channels
  4. Cardiac muscle repolarization is caused by opening of sodium channels
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TLS Online TPP Program

#Question id: 10218

#Unit 6. System Physiology – Plant

An effect that appears to be a major factor in the stability of the photosynthetic apparatus is photoinhibition, which occurs when excess excitation arriving at the PSII reaction center leads to its inactivation and damage due to
TLS Online TPP Program

#Question id: 11188

#Unit 7. System Physiology – Animal

Refer to the following graph of an action potential to answer the question.

The minimum graded depolarization needed to operate the voltage-gated sodium and potassium channels is indicated by the label ________.
TLS Online TPP Program

#Question id: 31330

#Unit 5. Developmental Biology

Which of the following signal molecules established parasegmental periodicity in drosophila?
a. Wingless
b. Hedgehog
c. Engrailed
d. Smoothened
TLS Online TPP Program

#Question id: 32265

#Unit 2. Cellular Organization

Persistently active signaling from the ER, particularly via PERK, activates genes that initiate:
TLS Online TPP Program

#Question id: 1794

#Unit 4. Cell Communication and Cell Signaling

Which of the following statements is TRUE of natural antibodies?