The term paralog is often used in conjunction with discussions of hemoglobin genes. What does this term mean, and how does it apply to hemoglobin genes?
What will be an ideal response?
Multiple proteins that arise from single-gene duplications are known as paralogs. The hemoglobin gene family encodes various polypeptides that are part of hemoglobin molecules and exemplify a multigene family that arose by duplication and dispersal into different chromosomes.
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Which of the following statements does NOT describe characteristics of heterospory?
A. Heterospory involves production of spores on two different parts of the same plant. B. Heterospory involves production of two different kinds of spores, one growing into male gametophytes and the other into female gametophytes. C. Heterospory increases the chance of cross-fertilization. D. Heterospory increases the potential for genetic variation and aids evolutionary flexibility. E. Heterospory only occurs in vascular plants.
Which of the following processes occurs first in the
adjustment of body-fluid volume? a. An inactive protein is converted into angiotensin. b. Distal tubules and collecting ducts reabsorb more sodium and water. c. Target cells secrete aldosterone. d. Receptors in walls of the heart detect a drop in blood pressure. e. Renin is secreted by cells within the kidneys.
Mendel selected seven traits to analyze in his famous pea plant crosses, and all of these traits yielded expected 3:1 phenotypic F2 ratios in monohybrid crosses. He was fortunate in his selection of these traits
How so? What problem might he have encountered that may have yielded confusing ratios?
Which of the following reactions is a hydrolysis reaction?
A. A + B ? C + H2O B. A ? B + C+ H2O C. A + H2O ? B + C D. A + B + H2O ? C