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TLS Online TPP Program

#Question id: 5681

What is the arrangement of microtubules in sperm flagellum?

#Unit 5. Developmental Biology

  1. The core of the axoneme consists of two central singlet microtubules surrounded by a row of nine doublet microtubules.

  2. The core of the axoneme consists of two central doublet microtubules surrounded by a row of nine singlet microtubules.

  3. The core of the axoneme consists a row of nine central singlet microtubules surrounded by two doublet microtubules.

  4. The core of the axoneme consists of two central triplet microtubules surrounded by a row of nine doublet microtubules.

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TLS Online TPP Program

#Question id: 534

#Unit 1. Molecules and their Interaction Relevant to Biology

If glucose labeled with 14C in C-3 is metabolized to lactate via fermentation, the lactate will contain 14C in:
TLS Online TPP Program

#Question id: 516

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following elements is required for the enzymatic reaction that produces phosphoenolpyruvate?
TLS Online TPP Program

#Question id: 18586

#Unit 7. System Physiology – Animal

Letting go of accumulated muscle stiffness and tension is the focus of this relaxation technique ______.
TLS Online TPP Program

#Question id: 5648

#Unit 5. Developmental Biology

Use the following information to answer the question. In order to test how sea urchin sperm bind to eggs, scientists isolated the egg receptor protein that binds to the sperm acrosomal protein called bindin. Plastic beads were coated with egg receptor for bindin (ERB1) from eggs of the sea urchin Strongylocentrotus purpuratus, and then the beads mixed with sperm from S. purpuratus or from the related species, S. franciscanus. The researchers counted how many sperm were bound to each bead. The results are shown in the graph below. Treatments:

A: S. purpuratus sperm mixed with S. purpuratus ERB1 beads

B: S. purpuratus sperm mixed with beads containing no ERB1 protein

C: S. franciscanus sperm mixed with S. purpuratus ERB1 beads

D: S. franciscanus sperm mixed with beads containing no ERB1 protein

 What is a broader implication from the observations of the experiment?
TLS Online TPP Program

#Question id: 28375

#Unit 5. Developmental Biology

 How the pelle protein is responsible for the formation of ventral side of the embryo?