Practice Questions

TLS Online TPP Program

#Question id: 10169

Which of the following is not the effect of C3 and C4 cycle in hot and dry climates ?

#Unit 6. System Physiology – Plant

elevated temperatures limit the rate of photosynthetic CO2 assimilation in C3 plants by decreasing the solubility of CO2
In C4 plants warm climates decrease the levels of CO2, but the low concentrations of cytosolic HCO3 − saturate PEP Case because the affinity of the enzyme for its substrate is sufficiently high
The optimal photosynthetic efficiency of C3 species generally occurs at temperatures lower than for C4 species
C4 species become less abundant in the tropics and subtropics and more abundant when latitudes depart from the equator

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TLS Online TPP Program

#Question id: 3815

#Unit 3. Fundamental Processes

Use the figure to answer the following question. A space probe returns with a culture of a microorganism found on a distant planet. Analysis shows that it is a carbon-based life-form that has DNA. You grow the cells in 15N medium for several generations and then transfer them to 14N medium. Which pattern in the figure would you expect if the DNA was replicated in a conservative manner?

TLS Online TPP Program

#Question id: 2060

#Unit 2. Cellular Organization

An animal cell lacking carbohydrates on the external surface of its plasma membrane would likely be impaired in which function?

TLS Online TPP Program

#Question id: 11336

#Unit 10. Ecological Principles

Which of the following is NOT a prediction arising out of Wilson-MacArthur's -Theory of Island Biogeography?

TLS Online TPP Program

#Question id: 28465

#Unit 5. Developmental Biology

Optic vesicle secrete two paracrine factor for the lens formation these signalling factor known as___