The absence of which of the following pigments
prevents a plant from responding to the duration of
light and darkness?
a. chlorophyll
b. xanthophyll
c. carotene
d. phytochrome
e. flavoproteins
Answer: d
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Which of the following statements is true of horsetails?
A. They have photosynthetic stems without leaves. B. They do not form roots. C. They produce tiny leaves arranged in whorls. D. Their stems are solid with densely packed photosynthetic cells. E. The fossil record indicates that they were always very small.
Which group is characterized by radially symmetrical members?
a. arthropods b. cnidarians c. flatworms d. mollusks e. annelids
In what stage of translation does the peptide bond join two amino acids?
a. initiation b. transcription c. elongation d. reparation e. termination
Which term refers to a fruit that develops from a single ovary in a single flower?
a. simple fruit b. accessory fruit c. multiple fruit d. aggregate fruit