A nucleic acid contains thymine, allowing you to conclude that:
A. this nucleic acid is DNA.
B. this nucleic acid is RNA.
C. this nucleic acid could be either DNA or RNA.
A. this nucleic acid is DNA.
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The control in an experiment
a. makes the experiment valid. b. is an additional replicate for statistical purposes. c. reduces the experimental errors. d. minimizes experimental inaccuracy. e. allows for comparisons to the experimental group.
Which of the following is NOT true concerning homologous chromosomes?
a. There are two of each kind. b. Each parent contributes one of each homologous pair. c. Most homologous chromosomes carry the same genes for the same traits. d. The number of homologous chromosomes is doubled in each generation. e. Homologous chromosomes pair up during early meiosis.
Which statement about muscle contraction is false?
a. The sliding filament model was developed by Hugh and Andrew Huxley. b. Acetylcholine released into the synaptic cleft stimulates muscle contraction. c. During contraction, the muscle length does not change, but the actin and myosin filaments shorten. d. Once the T tubules are depolarized, they open Ca2+ channels in the sarcoplasmic reticulum. e. Cross bridges are formed between myosin and actin during muscle contraction.
Which of the following statements regarding Ehrlichia is FALSE?
A. It usually causes a spotted rash similar to Rocky Mountain spotted fever. B. The organism reproduces inside the host's phagosomes. C. It is transmitted by ticks. D. It is an emerging infectious disease. E. It has three stages: elementary body, initial body, and morula.