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TLS Online TPP Program

#Question id: 2241

Which of the following statement(s) is (are) true of V-class proton pumps?


#Unit 2. Cellular Organization

  1. They are ATPases.

  2. They are present in membranes of plant vacuoles.

  3.  They serve to decrease the pH inside a lysosome.

  4. They can acidify the lumen of an organelle (or the extracellular space) because these pumps are electrogenic

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TLS Online TPP Program

#Question id: 4364

#Unit 3. Fundamental Processes

A researcher found a method she could use to manipulate and quantify phosphorylation and methylation in embryonic cells in culture. One of her colleagues suggested she try increased methylation of cytosine (C) nucleotides in the DNA of promoters of a mammalian system. Which of the following results would she most likely see?
TLS Online TPP Program

#Question id: 33531

#Unit 2. Cellular Organization

The data obtained during DNA microarray analysis showing wildtype vs. mutant expression of genes under different conditions, represented as
TLS Online TPP Program

#Question id: 3697

#Unit 3. Fundamental Processes

In the Meselson-Stahl DNA replication experiment, what percent of the DNA was composed of one light strand and one heavy strand after one generation of growth in 14N containing growth media?
TLS Online TPP Program

#Question id: 33305

#Unit 1. Molecules and their Interaction Relevant to Biology

For the given equation, which representation is correct
TLS Online TPP Program

#Question id: 3649

#Unit 3. Fundamental Processes

In eukaryotes, clusters (tandem arrays) of about 20–50 replicons initiate simultaneously at defined times throughout: