The idea that H. erectus populations in Africa, the Middle East, and Asia all collectively interbred and
evolved into H. sapiens is called the ____________________ hypothesis. Fill in the blank(s) with the appropriate word(s).
ANS: multi-regional
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The microbiologist receives a sputum specimen for culture in the microbiology laboratory. Upon receipt the microbiologist should:
a. complete the set-up of media for identifi-cation of pathogens. b. complete a direct Gram stain and prelimi-nary report. c. complete an abbreviated work-up of the specimen. d. complete a culture and definitive identifi-cation of pathogens.
Where do sperm form?
a. The vas deferens b. The epididymus c. The corpus cavernosum d. The seminiferous tubules
DNA contains many different gene regions that are transcribed into different ________
a. proteins b. polypeptides c. RNAs d. [proteins] and [polypeptides]
What do enzyme-linked receptors and growth factor receptors have in common?
A. Both regulate specific G proteins when bound to a hormone. B. Both regulate the transport of ions through channels. C. Both seldom affect the expression of genes within the nucleus. D. Both possess kinase activity when bound to a hormone. E. Both act as transcriptional factors.