Information flow in biological systems is necessary for negative or regulative feedback to operate. Which of these examples does NOT involve flow of information providing feedback?
A) Heat receptors send signals to promote sweating.
B) Low blood sugar causes the liver to convert starch to sugar to be released in the blood.
C) Drought kills many trees.
D) Bacterial genes for breaking down lactose are activated in the presence of lactose.
C
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Which event of fertilization occurs first?
A. fast block to polyspermy B. the entry of sperm DNA into the egg C. the slow block to polyspermy D. the acrosomal reaction E. the cortical reaction
Which features are found in pioneer species? a. High dispersal rates b. Mature fast c. All of these choices
d. Produce many offspring e. Rapid growth rates
The "cuddle hormone," secreted in greater quantities following sexual contact, is
a. testosterone. b. estrogen. c. follicle stimulating hormone. d. melatonin. e. oxytocin.
Gene that codes for a protein that ordinarily suppresses the cell cycle; inactivity due to a mutation can lead to a tumor.
What will be an ideal response?