Practice Questions

TLS Online TPP Program

#Question id: 7113

In flies, frogs, and chicks, gradients of morphogens determine the future antero-posterior and dorso-ventral axes of the developing embryo. How is the antero-posterior axis determined in C. elegans?

#Unit 5. Developmental Biology

bicoid protein is translated in the anterior of the fertilized egg, leading to a gradient that determines the antero-posterior axis
nodal triggers formation of an organizer that will determine the dorsal, and hence the anterior, side of the embryo
beta-catenin becomes localized to the nucleus in the future anterior cells after fertilization
sperm entry leads to a reorganization of the cytoskeleton and redistribution of maternally packaged PAR proteins, which in turn determine the antero-posterior axis

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TLS Online TPP Program

#Question id: 7149

#Unit 5. Developmental Biology

What role, if any, do Hox genes play in specification of neuronal fate?

TLS Online TPP Program

#Question id: 6998

#Unit 5. Developmental Biology

Which of the following is an adult organism that has fewer than 1,000 cells?

TLS Online TPP Program

#Question id: 11103

#Unit 7. System Physiology – Animal

A key mechanism of gas transport through the tracheal system is

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#Question id: 29505

#Unit 6. System Physiology – Plant

Cicutoxin is produced by plant as constitutive chemical defenses which is

a. Produced by Hemlock (Cicuta sp.)

b. Is a polyacetylene

c. Involved in repolarization of neuronal action potentials

d. Involved in the suspension of all muscular activity

Which of the following is true regarding Cicutoxin

TLS Online TPP Program

#Question id: 11364

#Unit 9. Diversity of Life Forms

Which of the following is a structure that permits conjugation to occur?