Which of the following is an INCORRECT pairing?
A) magnification; refraction of radiation
B) contrast; staining techniques
C) numerical aperture; curved glass
D) simple microscope; Leeuwenhoek
E) electron beams; shorter wavelength
C
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The discipline of microbiology is intimately associated with biochemistry and genetics, because cells are both biochemical catalysts and genetic coding devices
Indicate whether the statement is true or false.
Which of these processes is least likely to expand the coding capacity of the genome?
A. RNA editing B. alternative splicing C. poly(A) site choice D. RNA capping
You buy a bunch of small, round, red radishes at the grocery store; they are on sale because they have been sitting in the produce aisle for a while. When you get home you remove the stems and clean them. With the first bite, you notice their texture is not as crisp and crunchy as you like. Your friend says you should refrigerate them in a bowl of water overnight. The next day the radishes are crisp and crunchy again. What is the most likely explanation of why they became crunchy again after soaking in water?
a. The radish cells were hypertonic to the water in which they were soaking. So, the water moved by osmosis across the plasma membranes into the radish cells increasing the turgor pressure inside of the cells and making them crunchier. b. The radish cells were hypotonic to the water in which they were soaking. So, the water osmosed across the plasma membranes out of the radish cells decreasing the turgor pressure inside of the cells and making them crunchier. c. The radish cells were hypertonic to the water in which they were soaking. So, the water osmosed across the plasma membranes into the radish cells decreasing the turgor pressure inside of the cells. d. The radish cells were hypotonic to the water in which they were soaking. So, the water osmosed across the plasma membranes into the radish cells decreasing the turgor pressure inside of the cells.
How many consecutive mRNA bases are needed to specify an amino acid?
A) 64 B) 20 C) 4 D) 3