The tempo of the heartbeat is set by a cluster of specialized cardiac muscle cells called the ________
Fill in the blank(s) with correct word
sinoatrial (or SA) node
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Refer to the paragraph on the Krings et al. paper. Why did the researchers wear protective clothing and note so emphatically that they did so?
A) They needed to be certain there were no ancient pathogens on the sample that modern humans hadn't been exposed to. B) They needed to be sure not to harm the precious sample with oils from skin or moisture from their breath. C) They needed to minimize the chance of introducing their own mitochondrial DNA to the sample. D) They needed to follow careful, standardized laboratory procedures required by law and document their compliance.
An American nurse returning from serving in a hospital in the Congo experienced chills, fever, and sweats. The fever cycle peaked about every 48 hours. Which of the following is a likely diagnosis?
A. African sleeping sickness B. Malaria C. Leishmaniasis D. Histoplasmosis
If you see a red flower with very little odor, it is likely pollinated by ____
a. flies b. birds c. bats or moths d. butterflies e. bees
Which of the following types of light microscopy improves the resolution of thick specimens by illuminating one plane of the specimen at a time?
A) fluorescence microscopy B) phase-contrast microscopy C) confocal microscopy D) differential interference contrast microscopy E) brightfield microscopy