Which of the following pairs radioactive isotopes is used in radioactive fossil dating?
A. 40K and 14N
B. 12C and 40K
C. 12C and 40Ar
D. 14C and 40K
D. 14C and 40K
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The principal structural components of cilia and flagella are
a. actin microfilaments. b. myosin microfilaments. c. intermediate filaments. d. microtubules. e. collagen fibers.
Which of the following layers forms the outer covering of the gastrointestinal tract?
a. serosa b. mucosa c. conjunctiva d. muscle layer e. submucosa
Round seeds (R) are dominant to wrinkled seeds (r), and yellow seeds (Y) are dominant to green seeds (y). What is the expected phenotypic ratio of a cross between an RrYy and an rryy individual?
A) 1:2:1 B) 9:3:3:1 C) 3:1 D) 1:1:1:1
Which of the following is NOT a characteristic of saturated fats?
A) They are usually solid at room temperature. B) They contain at least one double bond. C) They are found in animals. D) Their fatty acids pack tightly together. E) They are a form of stored energy.