Cells acquire low-density lipoproteins (LDLs) by

A) diffusion.
B) receptor-mediated endocytosis.
C) exocytosis.
D) phagocytosis.


Answer: B

Biology & Microbiology

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Imagine that a lizard inhabits a desert where it has very few natural predators. During a year where resources are scarce, the lizard produces a handful of large eggs rather than several small eggs. This is an example of a(n) ____

Fill in the blank with the appropriate word.

Biology & Microbiology

The production of cyclic AMP in Dictyostelium results in ____

a. sexual reproduction b. cell division c. swimming d. spore production e. aggregation of cells

Biology & Microbiology

During which of the following stages do cells of

identical genetic makeup become structurally and functionally different from one another? a. cleavage b. differentiation c. morphogenesis d. metamorphosis e. gastrulation

Biology & Microbiology

If the nitrogenous bases of both a DNA transposon and a retrotransposon were tagged with fluorescent markers, what statement best describes the result after transposition of both types of transposable elements (TEs) has occurred?

A. The markers would be found at the new site of the retrotransposon, but not at the new site of the DNA transposon. B. The markers would be not be found at either new site. C. The markers would be found at the new site of the DNA transposon, but not at the new site of the retrotransposon. D. The markers would be found at the new sites of the DNA transposon and the retrotransposon.

Biology & Microbiology