Watson and Crick's model of the structure of DNA was published in:
A) 1975. B) 1949. C) 1961. D) 1923. E) 1953.
Answer: E
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In which group are retention of larval characteristics
and sexual maturity seen in the same body? a. toads b. salamanders c. frogs d. caecilians e. none of these
Members of which group are one of the most important producers in marine ecosystems, although
sometimes they form blooms known as red tides? a. green algae b. red algae c. euglenoids d. dinoflagellates e. brown algae
Kin selection refers to
A) the selection of a mate. B) deciding which related animals can live in the colony. C) deciding which related animals can share the food. D) determining which related animals must live and which must die. E) an animal promoting the survival of the genes of its close relatives.
A student examining leaf cross sections under a microscope finds many loosely packed cells with relatively thin cell walls. The cells have numerous chloroplasts. What type of cells are they?
A) parenchyma B) endodermis C) collenchyma D) sclerenchyma