How do positron emission tomography (PET) scans and functional magnetic resonance imaging (fMRIs) differ in brain study?
What will be an ideal response?
PET scans track the uptake of radioactively labeled glucose to reveal areas of metabolic activity in the brain. Glucose is the main energy source for brain cells, and active cells take up more than resting cells.
fMRIs reveal details of brain activity by detecting changes in blood flow. Active brain cells use more oxygen than resting cells, and increased blood flow provides the necessary oxygen.
They both allow visualization of brain activity, one via glucose uptake and one via blood flow.
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Some methanogenic Archaea are capable of fixing nitrogen.
Answer the following statement true (T) or false (F)
Which of the following is true about molecular methods of microorganism detection in foods?
A. They can be used to detect the presence of a single specific pathogen. B. They can be used to detect slow-growing pathogens. C. They can be used to detect viruses that are not easily cultured. D. All of the choices are correct.
Your roommate is having trouble with her biology lab and asks you for help, since you took biology last semester. She says she looked at an organism under a microscope in lab and is supposed to identify the organism based on what she saw
She knows she saw many cells with a nucleus, a cell membrane, and a structure that contained green pigments. (She thought it might have been a chloroplast.) What type of organism did she see? 1.a photosynthetic bacteria 2.a protist (single-celled eukaryote) 3.a plant 4.a prokaryote
Phosphorus can be obtained from organic sources only.
Answer the following statement true (T) or false (F)