How were ancient peoples involved in biotechnology?
What will be an ideal response?
Ancient peoples practiced the selective breeding of plants and animals, which is a form of biotechnology.
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Match the following items with the correct phrases.
_______1. Fixed or tissue ____________________ are called histiocytes. _______2. Like mast cells, these cells release histamine and other chemical mediators during type I hypersensitivity reactions. _______3. Increased numbers of these cells are found in the peripheral blood stream during allergic reactions and helminth infections. _______4. These cells are also called polymorphonuclear leukocytes, polys, or PMNs. _______5. These cells are monocytes rather than granulocytes. a. basophils b. eosinophils c. macrophages d. neutrophils
An octopus "tastes" with:
a. its mouth b. its nose c. receptors on its head d. its tentacles e. its skin
Which of the following best describes why the disks rose to the surface faster in the more concentrated hydrogen peroxide solutions?
a. There was more enzyme present in the more concentrated solutions. b. A greater amount of heat was generated in the more concentrated solutions. c. The more concentrated solutions lowered the activation energy of the reaction. d. The higher substrate concentrations in the more concentrated solutions speeded the reaction. e. The density of the water was lower in the more concentrated solutions.
Which of the following is true of a species that has a chromosome number of 2n = 16?
A) The species is diploid with 32 chromosomes per cell. B) The species has 16 sets of chromosomes per cell. C) Each diploid cell has eight homologous pairs. D) A gamete from this species has four chromosomes.