Phagocytotic cells such as macrophages identify a variety of enemies by recognizing markers unique to pathogens. They would be classified as which type of defense system?
What will be an ideal response?
innate internal defenses
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A layer of host cell membrane attached to a virus is called:
a. An envelope b. A protein coat c. A capsomere d. A capsid e. A plasmid
The process of cleavage initially produces a
a. zygote. b. morula. c. gastrula. d. puff. e. third germ layer.
The duplicated chromosome is composed of two sister chromatids held together at a
What will be an ideal response?
How did scientists obtain a gene that can make papaya plants resistant to a new papaya root fungus?
a. They synthesized a new gene by assembling a unique combination of amino acids. b. They found a root-fungus-resistant gene in grapes. c. They created the plant-root-resistant gene by combining genes from a tree and a type of algae. d. They removed a gene from the DNA of the root fungus.