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TLS Online TPP Program

#Question id: 7264

The Dictyostelia social amoebas are found in a wide range of soil habitats. They can come together to form a fruiting structure, in which a proportion of cells are sacrificed to build the stalk and the remainder differentiate into resilient dormant spores. This multicellular life cycle is common to all Dictyostelids. It consists of an interconnected programme of cell movement and cell differentiation, and has been intensively studied in the model organism D. discoideum. Few mutants (Column A) and phenotypes (Column B) are listed in the table given below.

    Column A

    Column B

A. Loss of function of cAMP-dependent protein kinase (PKA)

i. cell develop normally but unable to germinate

B. Loss of function of RegA

ii. Loose aggregate form

C. Loss of function of adenylate cyclase B

iii. No aggregation

D. Loss of function of gp80

iv. accumulation of cAMP and PKA activation

 Match the correct mutant with the observed phenotype.

#Unit 5. Developmental Biology
  1. A-iv, B-ii, C-iii, D-i
  2. A-iv, B-iii, C-i, D-ii
  3. A-ii, B-iii, C-iv, D-i
  4. A-iii, B-iv, C-i, D-ii
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TLS Online TPP Program

#Question id: 11947

#Unit 7. System Physiology – Animal

Why is milk produced only after delivery, not before?
TLS Online TPP Program

#Question id: 11083

#Unit 7. System Physiology – Animal

A 55-year-old male has a pulmonary embolism that partially blocks the blood flow to his right lung. Which point on the ventilation-perfusion line of the O2-CO2 diagram corresponds to the alveolar gas of his right lung?
TLS Online TPP Program

#Question id: 2799

#Unit 2. Cellular Organization

There are five major types of histones in eukaryotic cells. One of these is not part of the structure of nucleosomes and is thought to participate in forming the 30-nm condensed chromatin fiber. Which histone is this?
TLS Online TPP Program

#Question id: 11088

#Unit 7. System Physiology – Animal

At a fraternity party a 17-year-old male places a paper bag over his mouth and breathes in and out of the bag. As he continues to breathe into this bag, his rate of breathing continues to increase. Which of the following is responsible for the increased ventilation?
TLS Online TPP Program

#Question id: 10837

#Unit 10. Ecological Principles

Milkweeds contain