Insect hormones and their receptors _____
A) act independently of each other
B) are a focus in pest control research
C) utilize cell-surface receptors only
D) are active independently of environmental cues
B
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Which of the following statements about gametogenesis is correct (select all correct choices)?
A. In human males, spermatogenesis begins at puberty. B. In human females, primary oocytes form during puberty. C. In human females, the egg that is released during ovulation is a primary oocyte. D. In human females, a secondary oocyte arrests in metaphase II. E. In human males, spermatogenesis results in one full-sized sperm and three polar bodies.
A bowl of sugar water is very stable. In a cell, however, it is rapidly broken down into carbon dioxide and water, releasing stored energy. What is the best explanation for this observation?
A. Enzymes in the cell catalyze the breakdown of the glucose. B. Cells use energy to break down the glucose. C. Glucose is only broken down while dissolving into a watery solution, such as inside the cell. D. Glucose cannot be broken down outside of a cell. E. Glucose becomes more chemically reactive inside of a cell.
A key step in the evolution of vascular plants was the ability to produce __________, a strengthening
polymer in the walls of cells that function in support and conduction. a. lignin b. cellulose c. starch d. fructose e. cutin
The first stage in making vinegar involves fermentation by ________.
A. Gluconobacter B. Spirulina C. Acetobacter D. Pediococcus E. Saccharomyces