Which of the following is NOT one of the three steps (processes) involved in urine formation?
A. glomerular filtration
B. tubular reabsorption
C. countercurrent mechanism
D. tubular secretion
Answer: C
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The daughter cells produced by meiosis are ____
a. identical to the parent but genetically different from each other b. identical to each other but genetically different from the parent c. genetically different from the parent and each other d. genetically identical to the parent and each other e. genetically different from each other but with the same chromosome number as the parent
The circles in “B” are
a. fragments of the main bacterial DNA. b. plasmids. c. cDNA molecules. d. DNA templates. e. none of these.
Gram-positive bacteria are colored purple by the Gram stain because:
a. they have circular DNA molecules called plasmids that repel the stain. b. they have a capsule that lies outside the cell wall. c. they have a layer of glycoprotein called peptidoglycan outside of the cell membrane.
Epistasis often involves genes of an enzymatic pathway.
Answer the following statement true (T) or false (F)