Why does sour cream have a sharp, tart flavor
A) from the ADP produced by microbes during glycolysis
B) from the lactic acid, produced anaerobically by microbes
C) from the ethyl alcohol formed as the cream is broken down by microbes
D) from the citric acid released by microbes during the citric acid cycle
B
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Imagine you are entering a darkened cavern. You are excited, but also a little nervous. Your heart rate quickens, your blood pressure rises slightly, and your digestive system activity decreases as blood is diverted to your muscles—all changes that prepare you should you need to move rapidly. This type of change is an example of
A. positive feedback control. B. negative feedback control. C. a failure of homeostasis. D. feedforward regulation. E. open loop feedback.
Specimens for microbiologic studies should be:
a. transported to the laboratory within 48 hours of collection. b. collected in nonsterile specimen contain-ers. c. transported in sealable, leak-proof plastic bags with a separate section for paper-work. d. sent to the laboratory on ice, no matter what type of specimen.
Relative to the mRNA, which of the following moves during translocation?
a. attached tRNAs and the ribosome b. attached tRNAs and the polypeptide chain c. the ribosome only d. the ribosome and the polypeptide chain e. the polypeptide chain only
External fertilization is most common in animals living in ____
a. mountains b. prairies c. forests d. oceans e. deserts