Which of the following combinations correctly matches a phylum to its description?
A) Echinodermata — bilateral symmetry as a larva, water vascular system
B) Nematoda — segmented worms, closed circulatory system
C) Cnidaria — flatworms, gastrovascular cavity, acoelomate
D) Platyhelminthes — radial symmetry, polyp and medusa body forms
A
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Answer the following questions true (T) or false (F)
1. Observation of a natural event by more than one human or scientific instrument is the basis of the scientific method. 2. The experiments of Louis Pasteur to disprove spontaneous generation illustrate the process of the scientific method. 3. A theory must be supported by evidence.
When we say that DNA replication is semiconservative, we mean that:
A. only half of an organism's DNA is replicated during each cell division. B. when DNA is replicated, each new double helix contains one parental strand and one newly synthesized daughter strand. C. when DNA is replicated, one double helix contains both parental strands and one contains two newly synthesized daughter strands. D. parental DNA stays in the parent cell and daughter DNA ends up in the daughter cell. E. None of the answer options are correct.
Which statement is true?
a. Symptoms of Alzheimer’s disease are distinct from symptoms of normal aging. b. Many neurological disorders are treatable but have no known cure. c. Most neurological disorders can be reversed by changes in diet. d. Parkinson’s disease results in extreme shrinkage of the cerebral cortex.
Veins carry ________.
A. blood high in carbon dioxide B. blood low in oxygen and high in carbon dioxide C. blood high in oxygen D. blood low in oxygen