__________ are body parts that look alike in different lineages but did not evolve in a common
ancestor. Fill in the blank(s) with the appropriate word(s).
Analogous structures
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Each of the following small molecules easily diffuses through the cell membrane EXCEPT ____
a. steroid hormones b. O2 c. H2O d. glucose e. CO2
The key innovation that helped sporophyte
dominant plants survive in dry environments is a. spores. b. the cuticle. c. xylem. d. phloem. e. lignin.
What is one characteristic of sensory receptors?
a. Sensory receptors consist of the endings of efferent neurons. b. Sensory receptors detect changes in the external or internal environment. c. Several sensory organs make up a sensory receptor. d. Sensory receptors produce small amounts of energy on a continual basis. e. Sensory receptors detect changes in the external but not the internal environment
In a recent study, patients treated with a genetically engineered heart drug were able to walk on a treadmill for 26 seconds longer than those not receiving the drug and showed no side effects. Can we conclude that this drug is an effective treatment for heart disease?
a) yes b) no. it is not clear that the proper controls were made c) no. it is not clear that the drug is not a placebo d) no. it is not clear how many subjects were in the study e) no. genetically engineered drugs cannot be tested via the scientific method. they require comparative observations