According to the biological species concept, the evolution of reproductive barriers is the key to the origin of new species.
a. true
b. false
Answer: a. true
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New technology has made it possible to screen an individual's entire genome, instead of testing for one genetic disorder at a time. This technology uses ____________________ that carry DNA from the entire human genome
Fill in the blank(s) with correct word
Why is the protein-first hypothesis not accepted by most scientists?
a. Proteins cannot be catalysts. b. There is no known mechanism of protein self-replication. c. Of all of the macromolecules, only DNA can self-replicate. d. There is no evidence that proteins can store information. e. Proteins are too complex to have been the first "polymers of life."
Which male reproductive structure is “snipped” during a vasectomy?
1.epididymis
2.vas deferens
3.seminal vesicle
4.urethra
Which statement about the sense of smell in humans is most accurate?
A) Combinations of over 300 receptors allow us to discern thousands of scents. B) Smell is about equally as strong as taste. C) Ciliated cells rapidly move scent molecules to the brain for rapid analysis. D) One hundred different receptor varieties allow us to discern about 100 scents.