Gametophytes are multicellular plants that develop from reproductive cells called ________
Fill in the blank(s) with correct word
spores
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What happens first following a neuronal stimulation?
a. Sodium ions enter the cell. b. Sodium ions leave the cell. c. Potassium ions enter the cell. d. Potassium ions leave the cell. e. Potassium ions are involved in positive feedback.
In the field of plant transgenics, the use of the bacterium Agrobacterium tumefaciens has proven usefulbecause:a
it is not attacked by plant immune systems. b. it has been genetically engineered to penetrate the plant cell wall. c. it can directly modify the plant genome, causing it to make useful products for humans. d. it is found naturally in almost all species of plants. e. it is able to transfer a plasmid into host plant cells.
Which animals exhibit problem solving?
a. all vertebrates b. a few vertebrates, including primates c. only primates d. only humans
e. all vertebrates, and a few invertebratesKinesin 1 is a motor protein molecule consisting of
a. two heavy chains. b. one heavy chain and two light chains. c. two heavy chains and two light chains. d. two heavy chains and four light chains. e. four heavy chains and four light chains.