Which of the following statements about T lymphocytes is FALSE?
A. T lymphocytes produce antibody molecules.
B. T lymphocytes directly attack cells and produce the cell-mediated immune response.
C. T lymphocytes mature in the thymus.
D. T lymphocytes have TCRs that recognize unique antigens.
E. T lymphocytes require antigen presentation to become activated.
Answer: A
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What was the significance of the Hershey-Chase experiments in which 32P and 35S were used?
a. They finally demonstrated the semiconservative nature of DNA replication. b. They demonstrated that harmless bacterial cells had become permanently transformed through a change in the bacterial hereditary system. c. They established that pure DNA extracted from disease-causing bacteria transformed harmless strains into killer strains. d. They demonstrated that radioactively labeled bacteriophages transfer their DNA but not their protein coats to their host bacteria. e. They demonstrated that DNA content of a cell does not vary over time.
Which group belongs to the Chromalveolates?
a. diatoms b. apicomplexans c. chlorophyta d. rhodophyta
The membranous compartmentalization of a cell
A) divides the cell into two equal-sized halves. B) allows different chemical conditions to be maintained in different parts of the cell. C) requires the presence of a cell wall. D) is common to both prokaryotes and eukaryotes.
Which of these individuals are credited with the discovery of the structure of DNA?
A) Louis Pasteur B) James Watson and Francis Crick C) Gregor Mendel and T.H. Morgan D) Rosalind Franklin and Maurice Wilkins