Which of these have pattern recognition receptors?
a. macrophages
b. gram-positive bacteria
c. neutrophils
d. both macrophages and neutrophils
Answer: D
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Muscle cells make different proteins than nerve cells because they have different sequences of DNA
A. true B. false
The letter “A” in the above figure represents
a. sclerenchyma fibers. b. parenchyma. c. xylem. d. epidermis. e. phloem.
Adaptations that have enabled vertebrates to survive on land include all of the following EXCEPT
A. a water-resistant epidermis B. development of a bony skeleton C. development of longs D. external fertilization E. embryos enclosed within membranes
Brad placed a drop of blood in some distilled water. What happened in the red blood cells?
A. The cells burst. B. The cells did not change. C. The cells shrunk. D. The cells divided into two identical cells. E. The cellular metabolism increased in rate.