The photoreceptors that allows fine detail and color of an object are the
(a) cone cells.
(b) rod cells.
(c)all of the above
Answer: (a) cone cells.
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The first multicellular organisms (algae) appeared about __________ billion years ago.
A. 1 B. 1.8 C. 3.5 D. 13
A leaf primordium is initiated as a small mound of tissue on the flank of a dome-shaped shoot apical meristem. The earliest physical evidence of the site of a newly forming leaf primordium would be
a. development of chloroplasts in a surface cell of the shoot apical meristem. b. cell division in the shoot apical meristem with the newly forming walls perpendicular to the surface of the meristem. c. preprophase bands parallel to the surface of the meristem in subsurface cells of the shoot apical meristem. d. elongation of epidermal cells perpendicular to the surface of the shoot apical meristem. e. formation of stomata in the epidermal layer of the shoot apical meristem.
A new plant species may arise in a single generation by
A) errors in meiosis leading to polyploidy. B) a sudden geological disruption causing separation of two populations. C) mutations in genes for flower color. D) changes in the pollinator species.
Discuss the various ways by which antibodies interact with antigen and facilitate antigen inhibition or destruction.
What will be an ideal response?