Amniocentesis and genetic screening reveal that a fetus carries a defective L1-CAM gene. What defects do you expect, and why?
What will be an ideal response?
Answer: During embryogenesis N-CAM and L1-CAM function in the outgrowth and the bundling of neurons. Individuals expressing a defective L1-CAM will have defects in the brain corpus callosum, causing mental retardation and other neural defects.
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Bacteria that are capable of oxidizing both iron and sulfur usually have a strong preference for sulfur oxidation because it yields more energy
Indicate whether the statement is true or false.
MacConkey agar serves which purpose when used in the bacterial fecal culture?
a. Evaluation of general flora and predomi-nant species b. Selection of enteric pathogens such as Salmonella, Aeromonas, and others c. Inhibition of normal flora and selection of enteric pathogens d. Enrichment for enteric pathogens such as Salmonella and others
What level of ecology is concerned with groups of individuals of the same species?
A) community B) organism C) ecosystem D) population
In step 4 of the citric acid cycle, the reduction of NAD+ to NADH is coupled to the generation of CO2 and the formation of a high-energy thioester bond. The energy of the thioester bond is harnessed in step 5. What is the energy used for?
(a) to generate a molecule of GTP (b) to generate a molecule of ATP (c) to generate a proton gradient (d) to generate a molecule of NADH