__________ is the arrival of pollen grains on a receptive stigma. Fill in the blank(s) with the appropriate word(s)
Pollination
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How does the simple primary and secondary structure of DNA hold the information needed to code for the many features of multicellular organisms?
A) The hydrogen bonding among backbone constituents carries coded information. B) The base sequence of DNA carries the information needed to code for proteins. C) The width of the double helix changes at each gene due to differences in hydrogen bonds. D) The amino acids that make up the DNA molecule contain the information needed to make cellular proteins.
In seed plants, which develops into a pollen grain?
a. megaspore b. microsporangium c. microspore d. female gametophyte e. megasporangium
In the absence of oxygen, can cells utilize the electron transport chain?
A. No, oxygen is the primary electron acceptor in electron transport chains in all cell types. B. Yes, in the case that a cell can use a terminal electron acceptor other than oxygen, it can make use of the electron transport chain. C. No, oxygen is a required cofactor for the complexes in the electron transport chain. D. Yes, all cells can make use of the electron transport chain in the absence of oxygen via fermentation.
Chemical defenses are found in all of the following except
A. Batesian mimics. B. plants. C. insects. D. snakes, spiders, and fishes. E. marine animals.