Which of the following is not a protective mechanism seen in the stomach?
A. rapid division by and replacement of epithelial cells
B. secretion of proteinases as zymogens
C. mucus secretion
D. salivary amylase
E. All of these are mechanisms which protect the stomach
D. salivary amylase
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In situ mRNA techniques are powerful and can be run at almost any time, in any condition because bacterial mRNAs are so stable.
Answer the following statement true (T) or false (F)
This structure serves to block more than one sperm from entering the fertilized egg
a. acrosome b. yolk c. amnion d. fertilization membrane e. mitochondria
Which of the following statements is false?
a. The gametophytes of the ferns are free-living. b. The ferns are the largest and most diverse group of seedless, vascular plants. c. All the ferns and related primitive vascular plants have haploid sporophytes. d. Most ferns are tropical. e. Many of the ferns and their relatives have underground stems called rhizomes.
As soil acidity increases, the concentration of ________ increases
A) Ca2+ B) Al3+ C) Na+ D) NH4+