Answer the following statements true (T) or false (F)
1. Perception of salty tastes occurs at the level of the taste bud.
2. Death of hair cells resulting from repeated exposure to loud noises is thought to be caused by metabolic "exhaustion" of these cells from continuous activation.
3. The lateral line system of fishes functions to detect vibrations in the water around them.
4. The most common defect in color vision, termed red-green color blindness, results from a faulty opsin gene.
5. Compound eyes in invertebrate animals are composed of many smaller ommatidia.
1. FALSE
2. TRUE
3. TRUE
4. TRUE
5. TRUE
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Based on information in the figure above, why do individuals with kidney disease sometimes become anemic?
A) The diseased kidneys destroy circulating red blood cells. B) The diseased kidneys do not secrete adequate erythropoietin. C) Excessive red blood cells are lost in the urine due to leaky filtration in the diseased kidneys. D) Kidney disease spreads to the bones and interferes with red blood cell production.
What advantageous uses have viruses been shown to have?
A) The activities of viral genes mimic those of host genes so they are useful for studying mechanisms of DNA replication and gene expression in their much more complex hosts B) all of the choices are correct C) Bacteria-killing viruses may play an increasing role in the way against bacterial pathogens D) insect killing viruses may play an increasing role in the way against insect pests E) They can be used as a means to introduce foreign genes into human cells, which may serve as a basis for treatment of human diseases by gene therapy
Which of the following would contain
pluripotent stem cells?
a. an embryo before implantation in the uterus b. an embryo shortly after implantation in the uterus c. a placenta d. an umbilical cord e. more than one of these
Compare and contrast the homology that occurs in the forelimbs of mammals. What will be an ideal response?