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TLS Online TPP Program

#Question id: 32587

What happens to the endoplasmic reticulum (ER) and the Golgi apparatus when cells are treated with a drug that depolymerizes microtubules, such as colchicine or nocodazole?

#Unit 2. Cellular Organization
  1. The ER expands and the Golgi becomes more compact
  2. The ER collapses to the center, and the Golgi fragments and disperses
  3. Both ER and Golgi migrate to the cell membrane
  4. The ER and Golgi remain unaffected
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TLS Online TPP Program

#Question id: 5237

#Unit 5. Developmental Biology

Match the following stem cell type (Column I) with their niche location (Column II).

     Column I

Column II

A. Intestine

i. Bone marrow

B. Hematopoietic stem cells

ii. Bulge

C. Hair follicle

iii. Testes

D. Sperm

iv. Base of small intestinal crypts

Which of the following is correct?
TLS Online TPP Program

#Question id: 5238

#Unit 5. Developmental Biology

all tissue types possess a unique stem cell niche, and despite many differences among the niche architecture of different tissues, several common principles of stem cell regulation can be applied to all environments. These principles involve extracellular mechanisms leading to intracellular changes that regulate stem cell behavior.

Column A

Column B

I. Extracellular regulatory mechanisms

i. Regulation by endocrine, paracrine, or juxtacrine mechanisms

II. Intracellular regulatory mechanisms

ii. Regulation by a network of transcription factors

iii. Epigenetic regulation

iv. Regulation by cell-to-cell and cell-to-matrix adhesions

v. Regulation by cytoplasmic determinants

Match the following regulatory mechanism (column A) with the factors that regulate stem cell behavior (column B).
TLS Online TPP Program

#Question id: 5239

#Unit 8. Inheritance Biology

Which of the following statements is not true for Hfr strains of E. coli ?
TLS Online TPP Program

#Question id: 5240

#Unit 8. Inheritance Biology

If bacteria grow in the presence of a large amount of DNase, which of the following recombination process completely inhibited?
TLS Online TPP Program

#Question id: 5241

#Unit 8. Inheritance Biology

Genes a, b, and c are widely spaced in the bacterial genome. Transducing phage from an a+ b+ c+ bacterium were used to infect a culture of a- b- c- cells, and b+ transductants were selected. Which of the following best describes the predicted genotypes of these transductants?
TLS Online TPP Program

#Question id: 5242

#Unit 8. Inheritance Biology

Auxotrohic bacteria plating on different medium, it is observed that colonies grow on minimal plus threonine only, no colony on minimal plus leucine and no colonies grow on minimal medium cystein only. What are the actual genotypes of auxotroph?