TLS Online TPP Program

#Question id: 28839


Which of the following nucleates assembly of a microtubule by forming a template corresponding to the (−) end?

#Unit 2. Cellular Organization
  1. γ-tubulin ring complex (γ-TuRC)
  2. microtubulin-organizing centers (MTOCs)
  3. 8-subunit protein complex-Augmin
  4. dynactin
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TLS Online TPP Program

#Question id: 18073

#Unit 11. Evolution and Behavior

During which geological period was there an first definite evidence of land plants and algae dominant of many plants?

TLS Online TPP Program

#Question id: 28675

#Unit 2. Cellular Organization

What will be the result of combination of two positive feedback loops? 

TLS Online TPP Program

#Question id: 19025

#Unit 8. Inheritance Biology

Consider the ABO “blood type” gene. This single gene has three alleles called A, B, and O. There are four resultant “blood types” (phenotypic classes), as follows: C
                         
Assume Hardy-Weinberg equilibrium,  the frequencies of the A and B alleles are 0.26 and 0.07, respectively. You now examine the ABO blood types in a new population. You observe that the A, B, and O blood types all have equal frequencies in this population. What are the frequencies of the A and O alleles in this population?

TLS Online TPP Program

#Question id: 15833

#Unit 8. Inheritance Biology

Your friends Ben and Jane are contemplating having children and seek your genetic counsel. Ben and Jane are unrelated, but both have younger brothers with the same, extremely rare genetic trait. (In fact, Ben and Jane met at a support group meeting for children and families of children with this rare disorder.) Ben’s parents and Jane’s parents are all unaffected.          
Assume that the trait is autosomal dominant with 80% penetrance in heterozygotes and 100% penetrance in homozygotes. If not affected, what is the probability that the child is a carrier?

TLS Online TPP Program

#Question id: 7160

#Unit 5. Developmental Biology

How does the dose-dependence of retinoic acid treatment support the notion that a gradient of retinoic acid can act as a morphogen along the proximo-distal axis in the limb?