What is the function of the typical root and leaf structural shape?
A. To decrease surface area : volume ratio
B. To increase surface area : volume ratio
C. To increase growth rate
D. To increase longevity
Ans: B. To increase surface area : volume ratio
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The nucleus of a eukaryotic cell is separated from the cytoplasm by the
1.plasma membrane. 2.cell wall. 3.endoplasmic reticulum. 4.ribosomes. 5.nuclear envelope.
DNA
a. is one of the adenosine phosphates. b. is one of the nucleotide coenzymes. c. contains protein-building instructions. d. translates protein building. e. is single-stranded.
The main problem for sufferers of cystic fibrosis is
A. abnormal hemoglobin. D. missing DNA repair enzymes. B. elevated levels of cholesterol. E. formation of cysts in kidneys. C. mucus blocking ducts of glands.
How do radioactive isotopes differ from isotopes?
A) Radioactive isotopes have more neutrons than do isotopes. B) Radioactive isotopes are stable; isotopes are unstable. C) Radioactive isotopes have fewer neutrons than do isotopes. D) Radioactive isotopes are unstable; isotopes are stable.