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TLS Online TPP Program

#Question id: 4968

Which of these observations fails to support the endosymbiotic theory for the origin of eukaryotic cells?

#Unit 11. Evolution and Behavior

  1. the existence of structural and molecular differences between the plasma membranes of prokaryotes and the internal membranes of mitochondria and chloroplasts

  2. the existence of size differences between the cytosolic ribosomes of eukaryotes and the ribosomes within mitochondria and chloroplasts

  3. the existence of size differences between some prokaryotic cells and mitochondria

  4. the existence of rRNA sequence differences between the cytosolic ribosomes of eukaryotes and the ribosomes within mitochondria and chloroplasts

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TLS Online TPP Program

#Question id: 7019

#Unit 5. Developmental Biology

During primary sex determination in mammals, the bipotential gonad is moved into the female pathway (ovary development) by the Wnt4 and Rspo1 genes, which promote accumulation of:
TLS Online TPP Program

#Question id: 2196

#Unit 2. Cellular Organization

Substance X is a charged molecule of small molecular weight. It is found at higher concentrations outside of cells than inside. How might substance X enter cells?
TLS Online TPP Program

#Question id: 33452

#Unit 1. Molecules and their Interaction Relevant to Biology

For mixtures of nucleotides, a wavelength of 260 nm is used for absorption measurements for identification. Choose correct order of absorption spectra.
TLS Online TPP Program

#Question id: 23094

#Unit 12. Applied Biology

Bioaugmentation is a process that involves:
TLS Online TPP Program

#Question id: 2224

#Unit 2. Cellular Organization

Five dialysis bags, constructed of a type of membrane that is permeable to water and impermeable to sucrose, were filled with various concentrations of sucrose and then placed in separate beakers containing an initial concentration of 0.6 M sucrose solution. At 10-minute intervals, the bags were massed (weighed), and the percent change in mass of each bag was graphed.

Which line in the graph represents the bag with the highest initial concentration of sucrose?