Indirect interactions can be either positive or negative for the affected species
Indicate whether the statement is true or false
TRUE
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In order to add a single amino acid to a growing polypeptide chain, a grand total of ________ molecules or ATP or GTP are utilized.
A. three B. four C. six D. two
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.
The influenza virus contains an RNA genome. Why do scientists typically have to make a new vaccine for the flu every year?
A. because our bodies develop resistance to the vaccine and it becomes less effective B. because the virus develops resistance to the vaccine C. because the virus can mutate into new strains D. because people change their habits each year and become susceptible to different strains of the virus E. because the common influenza virus can come from many species of animals including cats and dogs
Colon cancer is the second most common type of cancer in the United States, second only to
a. lung cancer. b. breast cancer. c. skin cancer. d. prostate cancer. e. uterine cancer.