Imagine that you find a fossil skeleton of a Late Devonian vertebrate. Which feature would enable you to conclude that it was fully a tetrapod?
A) a flattened skull with dorsally facing orbits
B) the loss of skeletal support for any gills
C) the loss of dorsal and anal fins
D) well-developed joints between vertebrae, and between vertebrae and the pelvis
E) lungs to enable breathing of atmospheric oxygen
D
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Why are organisms with an odd number of chromosome sets usually sterile?
A) Almost all gametes will have an unbalanced set of chromosomes. B) Chromosomes will fail to segregate independently during meiosis I. C) Chromosomes will fail to segregate independently during meiosis II. D) Because an odd number of chromosomal sets is present, meiosis will not occur at all.
In which biome are coniferous trees most abundant?
A) tropical forests B) temperate forests C) deciduous forests D) boreal forests
Which of the follow produces a rash that leaves permanent scars on the skin?
A) Herpesviridae B) Papillomaviridae C) Poxviridae D) Adenoviridae E) Polyomaviridae
What is the photopigment in rod cells called?
A. Photopsin B. Melanin C. Rhodopsin D. Opsin E. Carotene