Practice Questions

TLS Online TPP Program

#Question id: 2145

An electrogenic Na+ transporter:

#XL - S Microbiology

catalyzes facilitated diffusion of Na+ from a region of high Na+ concentration to one of lower Na+ concentration.
must catalyze an electron transfer (oxidation-reduction) reaction simultaneously with Na+ transport.
must transport both Na+ and a counterion (Cl–, for example).
transports Na+ without concurrent transport of any other charged species.

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TLS Online TPP Program

#Question id: 5741

#XL - T Zoology

In a mammal 2 Barr bodies are observed. How many X chromosomes does the organism have?

TLS Online TPP Program

#Question id: 8919

#XL - R Botany

The last common ancestor of all animals was probably a

TLS Online TPP Program

#Question id: 1363

#XL - Q Biochemistry

Which of the following statements best describes the difference between low-affinity integrins and high-affinity integrins?

TLS Online TPP Program

#Question id: 19644

#XL - P Chemistry

When acetylene is treated with HBr, the product is ———-

TLS Online TPP Program

#Question id: 930

#XL - Q Biochemistry

Ketone bodies are formed in the liver and transported to the extrahepatic tissues mainly as: