The chemical evolution theory states that the first living molecule needed these two attributes:
A) It could acquire energy and catalyze reactions.
B) It could maintain homeostasis and acquire energy.
C) It could serve as a replication template and could catalyze reactions.
D) It could acquire energy and serve as a replication template.
Answer: C) It could serve as a replication template and could catalyze reactions.
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Indicate whether the statement is true or false
The electronegativity of nitrogen (N) is 3.0, while the electronegativity of hydrogen (H) is 2.1. Knowing this, consider how the electrons will be shared in ammonia (NH3). What do you predict about the polarity of ammonia?
A. Each H atom has a partial positive charge. B. The N atom has a strong positive charge. C. The N atom has a partial positive charge. D. Each H atom has a partial negative charge.
Imagine that beaker A has a 10% sucrose solution, and beaker B has an 8% sucrose solution. This means that
A) beaker A is isotonic relative to beaker B. B) beaker A is hypotonic relative to beaker B. C) beaker A is hypertonic relative to beaker B.
Lions are not always successful hunters and may go days between meals. What evolutionary adaptation helps the lion survive periods of famine?
A) formation of a two-chambered stomach B) an extended cecum C) an expandable stomach D) a rich microbial flora in the colon