In most human populations, lactase levels are highest soon after birth and drop off in middle-to-late childhood
a. True
b. False
True
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Which is not true of viruses?
A. They can exist in an intracellular or extracellular phase. B. They infect animal and plant cells only. C. They are acellular. D. They can be observed with an electron microscope. E. They replicate only inside host cells.
Which of the following intermediary metabolites enters the citric acid cycle and is formed, in part, by the removal of a carbon (CO2) from one molecule of pyruvate?
a. lactate b. acetyl CoA c. glyceraldehydes-3-phosphate d. citrate e. oxaloacetate
The Krebs cycle takes place in the
a. ribosomes. b. cytoplasm. c. nucleus. d. mitochondria. e. chloroplasts.
Which protein blocks the interaction sites that produce skeletal muscle contraction?
a. actin b. myosin c. troponin d. tropomyosin e. sarcoplasmic reticulum