Which developmental events are accurately placed in the following timeline? (Check all that apply.)
_____ after 6 days -- implantation
_____ after 1 week -- gastrulation
_____ after 2 weeks -- neurulation
_____ after 3 months -- organogenesis
_____ 266 days -- birth
__X__ after 6 days -- implantation
__X__ after 1 week -- gastrulation
__X__ after 2 weeks -- neurulation
_____ after 3 months -- organogenesis
__X__ 266 days -- birth
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New species evolve from pre-existing species by the accumulation of
A. metabolic events. B. genetic mutations. C. proteomes. D. reproductive events. E. developmental events.
Which pollutant would most likely be the source of coliform bacteria in a stream?
a. fertilizers from a golf course. b. discharge from a factory. c. forestry activities. d. sewage or animal wastes.
Why is it advantageous for cells to be small?
a. A small cell size prevents a cell from weighing too much. b. A small cell is better able to conserve energy than a larger cell. c. A small cell size occupies less space in nature where space is limited. d. A small cell has a small surface area relative to volume, thereby facilitating ion balance. e. A small cell has a small volume relative to surface area, thereby increasing efficient transport
Phospholipids are made up of:
A. five-carbon rings with two nonpolar tails. B. a glycerol and three fatty acids. C. four fused carbon rings. D. a phosphate, two fatty acids and a glycerol.