Answer the following questions true (T) or false (F)
1. Polyploidy is better tolerated in plants than in animals.
2. A single nondisjunction event results in some gametes with more chromosomes and some gametes with fewer chromosomes.
3. The structure of a molecule can be revealed by bombarding it with X rays.
1. TRUE
2. TRUE
3. TRUE
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Answer the following statements true (T) or false (F)
1. All diseases caused by Rickettsia spp. are arthropodborne. 2. Viruses contain both DNA and RNA. 3. The cell walls of archaeans contain a thicker layer of peptidoglycan than bacterial cell walls. 4. On entering a bacterial cell, all bacteriophages immediately initiate the lytic cycle. 5. Mycoplasmas cannot grow on artificial media.
Which of the following have body fluids with the same overall salt concentration as that of their environment?
a. oysters and sea stars b. whales and sea lions c. freshwater fish d. freshwater amphibians e. cats and dogs
A cell that undergoes meiosis at the time of
fertilization is indicated by a. A. b. B. c. E. d. A and B. e. none of these.
The stimulation of auditory nerves depends on the opening and closing of channels in the auditory hair cells. Which type of gating mechanism do these cells use?
(a) voltage-gated (b) extracellular ligand-gated (c) intracellular ligand-gated (d) stress-gated