Which are essentially equivalent treatments?
A.
Dry 200?C heat for 1.5 hours; wet 121?C heat for 15 minutes
B.
Dry 160?C heat for 1.0 hour; wet 200?C heat for 30 minutes
C.
Dry 121?C heat for 1.5 hours; wet 200?C heat for 15 minutes
D.
Dry 100?C heat for 2.0 hours; wet 100?C heat for 30 minutes
A
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There are cases, particularly in fruit flies, in which a normal body part grows in the wrong spot. For instance, legs on the head growing instead of antennae, or a second set of wings behind the normal pair. What can explain this?
A. These are due to the reappearance of stem cells, which are totipotent. B. These are due to misregulation of hormones from environmental contamination with pesticides. C. These occur as a result of mutations in homeotic genes, which normally act to direct development along the anterior-posterior axis. D. These naturally occur sometimes in animals that have metamorphic development, due to different organization of homeotic gene expression in larvae versus adults.
Within the stem of a vascular plant, where would you expect to find the cells that are the most mature?
A. within the shoot apical meristem at the tip of the stem B. within the zone of elongation directly beneath the shoot apical meristem C. at the base of the stem near the soil
Animals transitioned from water to land through a series of significant morphological and physiological changes. Which of the following did not contribute to the transition?
A. the ability to breathe air B. the evolution of appendages that could support the weight of the body C. the evolution of jaws for better prey capture and feeding
Animals most likely evolved most recently from ____.
A. colonial protists B. fungi C. amoebozoans D. algae E. cyanobacteria