Four of the five choices listed below are functional
groups. Select the exception.
a. steroid
b. amino
c. carboxyl
d. hydroxyl
e. aldehyde
Answer: a
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Who provided X-ray diffraction photographs of purified DNA fibers that suggested a helical structure with a consistent diameter of about 2 nm and a complete helical turn every 3.4 nm?
A. Hershey and Chase B. Chargaff C. Franklin D. Watson and Crick
What seagoing technology changed the course of navigation methods by providing an accurate means to determine the longitude of a ship?
a. Sextant b. Celestial charts c. Chronometer d. GPS
The life cycle of a zygomycete differs
markedly from that of animals because in this fungus a. a sexual stage is absent. b. mitosis occurs in the haploid growth stage. c. there is no fusion of nuclei. d. meiosis occurs to produce the haploid growth stage. e. a diploid stage is absent
Male fireflies are recognized by females of their species by their flash pattern, while male crickets are recognized by females of their species by their chirping. These are examples of
A. habitat isolation. B. mechanical isolation. C. temporal isolation. D. behavioral isolation.