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TLS Online TPP Program

#Question id: 2121

Which of the following membrane activities requires energy from ATP hydrolysis?

#Section 2: General Biology

  1. facilitated diffusion of chloride ions across the membrane through a chloride channel

  2. movement of Na+ ions from a lower concentration in a mammalian cell to a higher concentration in the extracellular fluid

  3. movement of glucose molecules into a bacterial cell from a medium containing a higher concentration of glucose than inside the cell

  4. movement of carbon dioxide out of a paramecium

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TLS Online TPP Program

#Question id: 3697

#Section 3: Genetics, Cellular and Molecular Biology

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: 3698

#Section 3: Genetics, Cellular and Molecular Biology

In this diagram of the process of DNA replication at a replication fork, the strand labeled B is the:
TLS Online TPP Program

#Question id: 3699

#Section 3: Genetics, Cellular and Molecular Biology

In this diagram of the process of DNA replication at a replication fork, the black boxes labeled D and E are:
TLS Online TPP Program

#Question id: 3700

#Section 3: Genetics, Cellular and Molecular Biology

In the Meselson-Stahl DNA replication experiment, if the cells were first grown for many generations in 15N containing media, and then switched to 14N containing media, what percent of the DNA had 1 light strand and 1 heavy strand after 2 generations of growth in 15N growth media?
TLS Online TPP Program

#Question id: 3701

#Section 3: Genetics, Cellular and Molecular Biology

Frederick Griffith accidentally discovered transformation when attempting to develop a vaccine for pneumonia. He injected mice with samples from S-strain (virulent) and/or R-strain (nonvirulent) pneumococci bacteria (Streptococcus pneumoniae). Which of the following results is NOT consistent with Griffith's experiments?
TLS Online TPP Program

#Question id: 3702

#Section 3: Genetics, Cellular and Molecular Biology

For the DNA strand 5'-TACGATCATAT-3' the correct complementary DNA strand is: