Which of the following statements is TRUE?
a. Once a person reaches maturity, cell division stops except to repair wounds.
b. Cell division in an adult signifies cancer.
c. Select cells throughout the body retain the ability to divide and replace themselves.
d. Growth continues throughout the life of an adult human.
e. All cells retain the ability to divide even after the organism reaches maturity.
ANSWER: c
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The letter “A” in the above figure represents
a. transverse. b. radial. c. tangential. d. elliptical. e. obtuse.
Besides ATP from the light reactions, the carbon reactions also require
A. NADPH from the light reactions. B. glucose from the mitochondria. C. CO2 from the atmosphere. D. Both a and c are correct.
Biofilm bacteria are beneficial in their
A) accumulation and attachment to damaged tissues in the human body. B) involvement in nutrient exchange between microbes and plant roots. C) invasive penetration of cooling towers and storage tanks. D) accumulation on hard surfaces such as teeth.
A biologist discovered a new animal. Upon studying its embryonic development, she observed radial cleavage with the blastopore developing into an anus. This animal was categorized as a
A. parazoan. B. deuterostome. C. pseudocoelomate. D. radiata. E. protostome.