The male pine cone
(a) produces pollen.
(b) contains a female gametophyte.
(c) bears a megasporangium containing a megaspore mother cell.
(d) gives rise to a seed.
(a) produces pollen.
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In humans, the amputation of a limb results in the loss of neurons in the brain due to the absence of its target cells
However, not all of these neurons are lost - some of them become re-routed, and can establish connections with other neurons. What is this process called?
a. sensitization b. plasticity c. long-term potentiation d. myelination e. cephalization
The transfer of energy directly from a photoexcited electron in a pigment molecule to another electron in an adjacent pigment molecule occurs by
A) photoexcitation. B) photochemical reduction C) photophosphorylation. D) resonance energy transfer. E) photorespiration.
Which of the following is properly matched?
A. Osteoblasts and bone breakdown B. Osteocytes and initial bone formation C. Osteoclasts and initial bone formation D. Osteoclasts and bone breakdown E. Osteoblasts and cartilage formation
Which of the following expresses an accurate difference between prokaryotic and eukaryotic cells?
A) Prokaryotes have organelles, but eukaryotes do not. B) Prokaryotic cells are larger than eukaryotes. C) Prokaryotes can be multicellular, but eukaryotes cannot. D) Eukaryotes have a nucleus, but prokaryotes do not.