Why are birds classified as reptiles?
What will be an ideal response?
Birds and reptiles both lay shelled eggs. The feathers of birds are modified reptilian body scales, but they retain scales on their legs.
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A cell that lacks the ability to make DNA repair enzymes will
A) be unable to replicate its DNA. B) replicate its DNA as rapidly as a normal cell, but the resulting DNA will have more errors in it. C) replicate its DNA as well as a cell with intact repair enzymes. D) be able to correctly replicate its DNA, but it will need more time to do so.
A mutation in the DNA of C. elegans will automatically lead to the production of a
nonfunctioning protein.
a. True b. False
What happens to a dust particle that is too large to stay airborne and land in the alveoli?
A) It lands in the respiratory bronchiole, where it is coughed out. B) It lands in the mucociliary ladder, where it is moved to the trachea to be exhaled. C) It lands in the mucociliary ladder and moves to the pharynx to be swallowed. D) It lands in the bronchi, where it is absorbed. E) It lands in the mucociliary ladder, where type II macrophages phagocytize them.
Exterior to the plasma membrane, plant cells have ________ which protect and support the plant cell.
Fill in the blank(s) with the appropriate word(s).