The structural difference between saturated and unsaturated fats causes what type of change at room temperature?
A. Linear structure of a fatty acid causes solid formation at room temperature.
B. Double bonds in saturated fatty acids cause a solid structure at room temperature.
C. A linear structure causes a loose forming macromolecule that is liquid at room temperature.
D. The double bonds require higher temperatures at room temperature to make this fatty acid into a liquid.
A. Linear structure of a fatty acid causes solid formation at room temperature.
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Which of the following events occur during anaphase I of meiosis?
A. The chromosome number is doubled during this phase of meiosis. B. In females, the two X chromosomes remain together. C. In males, the X chromosome is segregated from the Y chromosome. D. The centromeres of the chromosomes divide. E. Homologous chromosomes move as one unit.
The most common limit to plant growth is a lack of
a. phosphorous. b. carbon. c. hydrogen. d. oxygen. e. nitrogen.
The first land plants were bryophytes, which then branched into ferns, gymnosperms, and finally angiosperms. What advantage did angiosperms have over gymnosperms?
a. Angiosperms can produce flowers and fruits to aid in seed dispersal b. Angiosperms produce pollen and do not require water to reproduce c. Angiosperms go through alternation of generations d. Angiosperms have a vascular system, this allowed them to grow taller e. The angiosperms can produce spores which are more stable than seeds from gymnosperms
The difference between normal hemoglobin and sickle-cell hemoglobin is in the
a. heme portion of the molecules. b. number of chains of amino acids. c. substitution of a specific amino acid for another specific amino acid. d. addition of one amino acid to the normal hemoglobin molecule. e. deletion of only one amino acid from the normal hemoglobin molecule.