Which of the factors below weaken the hypothesis of abiotic synthesis of organic monomers in early Earthʹs atmosphere?

1.  the relatively short time between intense meteor bombardment and appearance of the first life forms

2.  the lack of experimental evidence that organic monomers can form by abiotic synthesis

3.  Uncertainty about which gases comprised early Earthʹs atmosphere

TLS Online TPP Program

#Question id: 31095

#Unit 4. Cell Communication and Cell Signaling

Ca²⁺ is released from the mitochondrial matrix into the intermembrane space by:

TLS Online TPP Program

#Question id: 1154

#Unit 4. Cell Communication and Cell Signaling

Which of the following events do not occur during the epinephrine-stimulated conversion of glycogen to glucose-1-phosphate?

TLS Online TPP Program

#Question id: 3455

#Unit 11. Evolution and Behavior

A duck egg is removed from its mother’s nest and incubated by a barnyard hen. The duckling hatches out in the presence of the barnyard hen and stays in her nest. After a couple of days, the duckling is presented with a choice between its biological mother and the hen that incubated it. The duckling approaches and follows the hen. This set of observations demonstrates the phenomenon of

TLS Online TPP Program

#Question id: 30099

#Unit 1. Molecules and their Interaction Relevant to Biology

The major control of de novo pyrimidine nucleotide synthesis in man is:

TLS Online TPP Program

#Question id: 12328

#Unit 10. Ecological Principles

The dominant species in a community is