Gametophytes that are completely enclosed within the walls of a spore are known as
A. endospermic sporophytes.
B. micropyles.
C. heterosporic lycophytes.
D. phragmoplasts.
E. endosporic gametophytes.
Answer: E
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Benedict's reagent is a chemical that is used as a test for the presence of a free aldehyde functional group on glucose. The aldehyde is used when glucose and fructose bind together to form sucrose, and the Benedict's test is negative. Starch contains a great deal of glucose but gives a negative Benedict's test because:
A. all of the aldehyde groups on the starch are oxidized and cannot react with the Benedict's reagent. B. glucose in starch has lost a carbon atom and cannot react with Benedict's reagent. C. only the glucose at the end of a chain of starch will have an exposed aldehyde functional group to react with Benedict's reagent. D. starch is not soluble in water and cannot react with Benedict's reagent.
A carpel is the
(a) same as a megasporophyll. (b) structure producing pollen grains. (c) component making up the anther. (d) synonym for microsporophyll.
An avid gardener in eastern North America begins to have a fever and cough. A sample from her lungs contains yeast cells and pus. She may be infected with
A. Amanita phalloides. B. Blastomyces dermatitidis. C. Claviceps purpurea. D. Mucor. E. Paracoccidioides brasiliensis.
Plant hormones bind specific cellular receptor molecules that trigger gene expression responses. Which statement is correct concerning these responses?
A. Only cells lacking receptors can bind hormones. B. Only cells in the meristem can respond. C. Only cells that express the appropriate receptors can bind hormones. D. Only cells that have been previously activated can bind hormones. E. None of these choices is correct.