Membrane-like structures form when proteins or lipids are mixed with water. They serve as a model

for __________, which may have preceded cells. Fill in the blank(s) with the appropriate word(s).


protocells

Biology & Microbiology

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The single-celled yeast, Saccharomyces cerevisiae, was used to construct the first eukaryotic artificial chromosome. This was a significant achievement because

A) yeast centromeres are identical to human centromeres. B) it defined chromosomal regions that serve as centromeres and origins of replication in yeast. C) it revealed the rate of DNA replication in yeast. D) it demonstrated that some yeast genes are not essential. E) it defined the chromosomal region with the TRP+ gene for tryptophan synthesis in yeast.

Biology & Microbiology

In adaptive immune responses, which cell type is capable of acting as an antigen-presenting cell?

a. T cell b. monocyte c. eosinophil d. B cell e. basophil

Biology & Microbiology

Which of the following will occur in meiosis but not in mitosis?

a)metaphase b)cytokinesis c)crossing over d)DNA replication e)chromosome condensation

Biology & Microbiology

The deamination of cytosine generates a uracil base. This is a naturally occurring nucleic acid base, and so does not represent a DNA lesion caused by damage due to chemicals or irradiation

Why is this base recognized as "foreign" and why is it important for cells to have a mechanism to recognize and remove uracil when it is found in the DNA duplex?

Biology & Microbiology