What are the components of nucleotides?

a. an amine group, a carboxyl, and a side chain
b. a nitrogenous base, a sugar, and one or more phosphate groups
c. a nitrogenous base, a carboxyl, and a side chain
d. an amino, a phosphate group, and a fatty acid chain


b

Biology & Microbiology

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A mutation in a gene that results in a defective protein product is known as a ____ mutation

Fill in the blank with the appropriate word.

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Which plants are characterized by a conducting system, the possession of cuticles, specialized stems, and roots, stomata, and, in many species, seeds?  

A.  liverworts B.  mosses C.  tracheophyte D.  horsetails E.  club mosses

Biology & Microbiology

Which of the following is the least reliable form of contraception?

a. condoms b. sterilization c. withdrawal d. oral hormonal

Biology & Microbiology

Passing on traits or characteristics that were acquired during the lifetime of an organism to its

offspring is a concept that is attributed to: a. Alfred Wallace. b. Charles Darwin. c. Charles Lyell. d. Jean Baptiste de Lamarck. e. Thomas Malthus

Biology & Microbiology