Uptake of low-density lipoproteins (LDLs) occurs by
A) simple diffusion.
B) phagocytosis.
C) facilitated transport.
D) receptor-mediated endocytosis.
E) pinocytosis.
Answer: D
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After mutagenesis, the nitrogen-fixing bacterium Sinorhizobium meliloti could no longer colonize Medicago truncatula plants. This inability to colonize was due to the absence of recognition by the host plant
Which of the following genes is most likely the site of the mutation in these bacteria? A) nitrogenase B) flavonoid-synthesizing enzyme C) Nod factors D) leghemoglobin E) peptidoglycans of the bacterial cell wall
What are the major trophic groups of terrestrial microbes and where in terrestrial ecosystems are they found?
What will be an ideal response?
A ________ is a complex of RNA and protein that serves to remove introns from pre-mRNA
Fill in the blank with correct word.
If an African violet has chlorosis, which of the following elements might be a useful addition to the soil?
A) molybdenum B) copper C) iodine D) magnesium