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TLS Online TPP Program

#Question id: 11746

Sieve element sap is rich in sugars and other organic molecules, These molecules represent an energy investment for the plant. How their loss be prevented when sieve elements are damaged?

#Unit 6. System Physiology – Plant
  1. Short-term sealing mechanisms not involve sap proteins
  2. long-term mechanism for preventing sap loss entails closing sieve plate pores with callose   
  3. For preventing sap loss using smooth endoplasmic reticulum (SER) which covers the sieve areas  
  4. long-term mechanism for preventing sap loss opening of the sieve tube in angiosperm
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TLS Online TPP Program

#Question id: 2514

#Unit 2. Cellular Organization

In what way are intermediate filaments similar to both microtubules and microfilaments?
TLS Online TPP Program

#Question id: 2515

#Unit 2. Cellular Organization

Which of the following cell types would be the best source of actin?
TLS Online TPP Program

#Question id: 2516

#Unit 2. Cellular Organization

Which of the following is essential for treadmilling to occur down the length of an actin filament?
TLS Online TPP Program

#Question id: 2517

#Unit 2. Cellular Organization

Which types of cell motility can occur in the presence of actin alone (without myosin)?
TLS Online TPP Program

#Question id: 2518

#Unit 2. Cellular Organization

In an analogy between skeletal muscle motility and a railroad, if actin is the railroad tracks and ATP is the diesel fuel, what is the locomotive?
TLS Online TPP Program

#Question id: 2519

#Unit 2. Cellular Organization

If you compared under the microscope a contracted sarcomere to a relaxed sarcomere, which of the following regions would not differ in width?