The electrical stimulus for each human heartbeat begins in the ____ at the _____ node.
A. right atrium, sinoatrial.
B. left atrium, sinoatrial.
C. right atrium, atrioventricular.
D. right ventricle, atrioventricular.
E. pulmonary trunk, sinoatrial.
A. right atrium, sinoatrial.
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Which of the following occurs in prokaryotes but not in eukaryotes?
A) post-transcriptional splicing B) concurrent transcription and translation C) translation in the absence of a ribosome D) gene regulation
Calvin Bridges, an associate of Thomas Hunt Morgan's, found further evidence that genes were located on chromosomes. Which of the following is not a component of his study?
A. He crossed white-eyed females (XwXw) with red-eyed males (XWY). B. The F1 progeny were mostly the red-eyed males and white-eyed females expected. C. A few rare white-eyed females and red-eyed males were observed, which he called primary exceptionals. D. He proposed that the rare white-eyed females were the result of abnormal chromosome number. E. Abnormal chromosome number was a result of nondisjunction in the female fly.
Semiconservative DNA replication means that
A) A pairs with T and G pairs with C. B) each new DNA molecule has half the DNA from the old one. C) the old DNA is completely broken down. D) the old DNA remains completely intact. E) only half of the DNA is replicated.
An example of a bariatric surgical procedure used today for treating severely obese individuals is ____________.
Fill in the blank(s) with the appropriate word(s).