In seed plants, __________ allow reproduction without standing water.
Fill in the blank(s) with the appropriate word(s).
pollen grains
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Select the correct sequence of steps as energy is extracted from glucose during cellular respiration.
A. glycolysis ? citric acid cycle ? acetyl CoA ? electron transport chain B. glycolysis ? acetyl CoA ? citric acid cycle ? electron transport chain C. acetyl CoA ? citric acid cycle ? electron transport chain ? glycolysis D. electron transport chain ? citric acid cycle ? glycolysis ? acetyl CoA E. citric acid cycle ? electron transport chain ? glycolysis ? acetyl CoA
In angiosperms, pollen is the product of a haploid microspore dividing mitotically. Therefore, pollen is
A. a sporophyte. B. a seed. C. a gametophyte. D. a spore. E. sperm.
Which of the following best compares meiosis and mitosis?
a. Meiosis produces daughter nuclei that have the same number of chromosomes as the original cell, while mitosis produces daughter nuclei with a different number of chromosomes as the original cell. b. Meiosis produces daughter nuclei that have half the number of chromosomes as the original cell, while mitosis produces daughter nuclei with the same number of chromosomes as the original cell. c. Meiosis produces daughter nuclei that have the same number of chromosomes as the original cell, while mitosis produces daughter nuclei with half the number of chromosomes as the original cell. d. Meiosis and mitosis both produce daughter nuclei with a different number of chromosomes t
In certain cancerous cells, the cell divides continuously even in the absence of a growth factor (signaling molecule) that indicates the cell should divide. Which of the following could NOT explain this?
A) a receptor molecule that is always turned off B) a receptor molecule that is always activated C) a transduction pathway that is always turned on D) a target protein that is always activated E) a gene for cell division that is expressed when it should not be