Evolution can be defined as
A) one species diverging into two species.
B) a change in the genetic makeup of a population over time.
C) a change in the phenotype of an individual over his or her lifetime.
D) a change in the genetic makeup of an organism over time.
E) an individual changing into another species.
B
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In humans and other mammals, the sex-determining region in the Y chromosome is required for male development
A. true B. false
The first several cleavages after fertilization occur in the:
a. uterus cavity b. ovary c. vagina d. oviduct e. uterine wall
Which is incorrect about inducible operons?
A. They have genes turned off by a buildup of end product. B. They are turned on by the substrate of the enzyme. C. They include the lac operon. D. They are often for use in catabolic pathways. E. They are normally turned off.
A necropsy (postmortem analysis) of a marine sea star that died after it was mistakenly placed in fresh water would likely show that it died because _____
A) it was stressed and needed more time to acclimate to the new conditions B) it was so hypertonic to the fresh water that it could not osmoregulate C) its contractile vacuoles ruptured D) its cells dehydrated and lost the ability to metabolize