In angiosperms, meiosis of cells in the ovule give rise to haploid megaspores. What happens next?
a. Mitosis gives rise to a seed.
b. Mitosis gives rise to an egg, a cell with two nuclei.
c. Mitosis gives rise to a sporophyte.
d. Meiosis gives rise to a dipold egg and a cell with two nuclei.
e. Meiosis gives rise to a more megaspores.
b
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The disease osteoporosis involves loss of both mineral and organic components from bones. Factors that may contribute to the development of osteoporosis include
_____ prolonged disuse of muscles. _____ lack of calcium and vitamin D in the diet. _____ excess fat in the diet. _____ a decline in estrogen following menopause in women. _____ a history of extreme sport participation.
The midpiece of the mature sperm contains mitochondria that provide metabolic energy for the trip to the egg. Fructose (simple sugar) is used as fuel by the sperm. From where is this fructose secreted?
A) prostate gland B) seminal vesicles C) bulbourethral gland D) acrosome
If the Avery-MacLeod-McCarty transformation experiment was carried out in an RNA world, the transforming activity would be destroyed by:
a. RNase. b. lipase c. DNase d. protease
A solution is a mixture of
a. polar and nonpolar substances. b. protons and neutrons. c. unevenly distributed substances. d. evenly distributed substances.