Prior to staining, smears of microorganisms must be heat-fixed in order to ________.
A. allow eventual visualization of internal structures
B. ensure removal of dust particles from the slide surface
C. create small pores in cells that facilitates binding of stain to cell structures
D. attach them firmly to the slide
Answer: D
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How do genomes of species change?
a. By mutations in DNA. b. When individuals are exposed to a new habitat. c. Through extinction. d. They don't.
In vertebrates, the family of myogenic regulatory factors (MRFs) plays a major role in muscle development. This family consists of four related genes that have distinct but overlapping functions. This gene family is represented by only a single gene in Drosophila, called nautilus. You want to know whether nautilus plays a role like all of the MRFs put together, or more like one in particular. What is a quick and easy way to begin to address this question?
A. Use a DNA microarray to compare gene activation patterns between nautilus and the MRFs. B. Compare the proteome of a cell expressing nautilus to the those of cells expressing each of the MRFs in turn. C. Generate four transgenic Drosophila strains that express the MRFs in a mutant nautilus background. D. Compare the DNA and protein sequences of all the genes to determine if nautilus is more similar to one MRF than another.
The stapes, malleus, and ________ bones are located in the middle ear
Fill in the blank(s) with correct word
Which of the following is the most common type of alternative splicing in animals and involves making mRNA molecules that lack a complete exon?
A) intron retention B) mutually exclusive exons C) alternative splice site D) alternative promoters E) cassette exons