What is phagocytosis? What function does it serve?
What will be an ideal response?
Phagocytosis is cell eating, i.e., a phagocyte will extend projections of cytoplasm that “pull” in a solid particle or another cell. Phagocytosis is a means through which to bring particles, food typically, into the cell.
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Which purine base forms 3 hydrogen bonds when binding its complementary nucleotide base?
A. guanine B. cytosine C. thymine D. uracil E. adenine
The LEAST most parsimonious explanation for the existence of beaks in birds is that
a. they arose once in a common ancestor of beaked groups. b. they arose multiple times in different bird lineages. c. they are a product of convergent evolution among birds. d. they are not a genetically determined trait, and thus independent characters. e. they arose one time in one bird lineage
Refer to Figure 12-2. The correct designation for the DNA strand labeled C is:
a. the leading strand.
b. 3?.
c. Okazaki fragments.
d. polymerase.
e. a strand serving as a template.
Why are cells considered to be the smallest unit of life?
A. Because you need a microscope to see them B. Because a cell is the smallest thing that carries out all the functions of life C. Because they have an organized structure D. Because all cells have a nucleus with DNA