TLS Online TPP Program

#Question id: 5102


Why was the evolution of the extraembryonic membranes crucial for colonization of land by the vertebrates? Extraembryonic membranes ________.

#Unit 5. Developmental Biology
  1. provide an aqueous environment for embryo development

  2. provide nutrients that produce energy for development

  3. direct morphogenesis within the embryo

  4. give rise to crucial organ systems, like the heart and brain

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TLS Online TPP Program

#Question id: 73

#Unit 1. Molecules and their Interaction Relevant to Biology

Match the Variation of Reaction Spontaneity (Sign of ΔG) given in Column I with the Signs of ΔH and ΔS given in column II.

COLUMN I

COLUMN II

 

 

 

  ΔH

ΔS

ΔG = ΔH – TΔS

1.

+

a. The reaction is both enthalpically and entropically opposed. It is nonspontaneous (endergonic) at all temperatures.

2.

 −

− 

b. The reaction is enthalpically opposed (endothermic) but entropically favored. It is spontaneous only at temperatures above T = ΔH/ΔS.

3.

+

+

c. The reaction is enthalpically favored but entropically opposed. It is spontaneous only at temperatures below T = ΔH/ΔS.

4.

+

d. The reaction is both enthalpically favored (exothermic) and entropically favored. It is spontaneous (exergonic) at all temperatures.

TLS Online TPP Program

#Question id: 10603

#Unit 10. Ecological Principles

The population size of a bird increased from 600 to 700 in one year. If the per capita birth rate of this population is 0.50, what is its per capita death rate?

TLS Online TPP Program

#Question id: 135

#Unit 1. Molecules and their Interaction Relevant to Biology

 Concentrations of some proteins cannot be estimated by UV spectrophotometry because they are

TLS Online TPP Program

#Question id: 820

#Unit 1. Molecules and their Interaction Relevant to Biology

The protein unfolding  or protein denaturation is

TLS Online TPP Program

#Question id: 2943

#Unit 2. Cellular Organization

Which of the following is NOT a mechanism by which G1/S cyclin-CDKs ensure progression through the cell cycle?