Which of the following is true about mutations?
A. Mutations are changes in the nucleotide sequence of DNA.
B. Mutations are always detrimental to the health of the organism.
C. Mutations always involve a change in the resulting protein.
D. Mutations are always caused by mutagens, including radiation, chemicals, or viruses.
Answer: A
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help to control the shape of cells are
a. plastids. b. vacuoles. c. microtubules. d. nucleoli. e. microfilaments
Carbohydrate molecules:a
serve as structural components of human cell walls. b. form the regulatory compounds known as enzymes. c. are a source of energy. d. help protect vital organs from damage. e. contain the genetic information of a cell.
cholesterol transported by HDL is metabolized in what organ
What will be an ideal response?
Which of these animals use gills to respire?
A) Spiders B) Tadpoles C) Jellyfishes D) Insects E) Earthworms