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TLS Online TPP Program

#Question id: 4623

 Which of the events described below agrees with the idea of catastrophism?

#Unit 11. Evolution and Behavior

  1. The gradual uplift of the Himalayas by the collision of the Australian crustal plate with the Eurasian crustal plate

  2. The formation of the Grand Canyon by the Colorado River over millions of years

  3. The gradual deposition of sediments many kilometers thick on the floors of seas and oceans

  4. The sudden demise of the dinosaurs, and various other groups, by the impact of a large extraterrestrial body with Earth

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TLS Online TPP Program

#Question id: 18836

#Unit 13. Methods in Biology

Which of the following is/are not a component of a polymerase chain reaction mixture?
TLS Online TPP Program

#Question id: 3038

#Unit 2. Cellular Organization

If a culture starts with 50 cells, how many cells will be present after five generations with no cell death?
TLS Online TPP Program

#Question id: 28702

#Unit 2. Cellular Organization

Oligosaccharyl transferase enzyme involves to transferred precursor oligosaccharide 
TLS Online TPP Program

#Question id: 382

#Unit 1. Molecules and their Interaction Relevant to Biology

The molar ratio of sodium acetate to acetic acid in a buffer solution with a pH OF 5.76 is 10:1. Assuming the total buffer concentration is 2.2 X 10-2 mol/L, how many grams of sodium acetate (m.w. 82) and how many grams of acetic acid (m.w. 60) should be used in preparing a litre of the solution?
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).