TLS Online TPP Program

#Question id: 4657


 Which of the following statements most detracts from the claim that the human appendix is a completely vestigial organ?

#Zoology
  1. The appendix can be surgically removed with no immediate ill effects.

  2. The appendix might have been larger in fossil hominids.

  3. The appendix has a substantial amount of defensive lymphatic tissue.

  4. Individuals with a larger-than-average appendix leave fewer offspring than those with a below-average-sized appendix.

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TLS Online TPP Program

#Question id: 2072

#Zoology

Which of the following structures would decrease the electrochemical gradient across a membrane?

TLS Online TPP Program

#Question id: 2073

#Biochemistry

The phosphate transport system in bacteria imports phosphate into the cell even when the concentration of phosphate outside the cell is much lower than the cytoplasmic phosphate concentration. Phosphate import depends on a pH gradient across the membrane—more acidic outside the cell than inside the cell. In this bacterial cell, phosphate transport is an example of:

TLS Online TPP Program

#Question id: 2073

#Zoology

The phosphate transport system in bacteria imports phosphate into the cell even when the concentration of phosphate outside the cell is much lower than the cytoplasmic phosphate concentration. Phosphate import depends on a pH gradient across the membrane—more acidic outside the cell than inside the cell. In this bacterial cell, phosphate transport is an example of:

TLS Online TPP Program

#Question id: 2074

#Biochemistry

In some cells, there are many ion electrochemical gradients across the plasma membrane even though there are usually only one or two proton pumps present in the membrane. The gradients of the other ions are most likely accounted for by:

TLS Online TPP Program

#Question id: 2074

#Zoology

In some cells, there are many ion electrochemical gradients across the plasma membrane even though there are usually only one or two proton pumps present in the membrane. The gradients of the other ions are most likely accounted for by:

TLS Online TPP Program

#Question id: 2075

#Biochemistry

The force driving simple diffusion is: