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TLS Online TPP Program
#Question id: 11164
#Unit 2. Cellular Organization
Cellular membranes are self-sealing— if they are punctured or disrupted mechanically, they quickly and automatically reseal. What properties of membranes are responsible for this important feature?
TLS Online TPP Program
#Question id: 2438
#Unit 2. Cellular Organization
Rac, a GTPase superfamily protein,
a. is related to Ras.
b. may be activated by growth factors.
c. stimulates lamellipodia formation.
d. stimulates filopodia formation.
e. stimulates stress fiber assembly.
TLS Online TPP Program
#Question id: 29015
#Unit 7. System Physiology – Animal
Which of the following enzyme converts 25-hydroxycholecalciferol to the active form, 1,25-dihydroxycholecalciferol?
TLS Online TPP Program
#Question id: 18082
#Unit 8. Inheritance Biology
The interaction of selection and inbreeding in determining the incidence of autosomal recessive diseases. Consider a gene in which recessive mutations occur at a rate of 10-5. Assume a selective disadvantage S of 0.4 in homozygotes for the recessive allele. Now assume that, for thousands of generations, 10% of all children have been products of first-cousin matings (the remaining 90% being products of random matings). Calculate the steady-state value of q. Also calculate the incidence of the disease at steady state.
TLS Online TPP Program
#Question id: 26919
#Unit 10. Ecological Principles
Species cannot coexist permanently in a community, if_____