Although the total number of human genes (20,000-25,000) is much less than originally predicted (100,000), how many different proteins can be produced?
What will be an ideal response?
Ans: Human cells produce about 50,000-60,000 proteins. An early notion was that one gene produced one RNA which produced one protein. However, it is now predicted that as many as 60% of the mRNAs in humans are alternatively spliced to produce slightly different forms of the protein with different functions.
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Siderophores from some pathogens remove iron from the host protein(s)
A) lactoferrin. B) transferrin. C) both lactoferrin and transferrin. D) cytochromes.
When fat enters the duodenum, it stimulates release of ____
a. amylase b. cholecystokinin c. gastrin d. secretin e. trypsin
Answer the following statements true (T) or false (F)
1. The smallest scale of biological organization is represented organelles. 2. Decomposers are a special group of producers. 3. In an experiment designed to determine if a fertilizer increased crop yield in tomato plants, the number of tomatoes produced by each plant would be the independent variable. 4. In an experiment designed to determine if a fertilizer increased crop yield in tomato plants, the number of tomatoes produced by each plant would be the dependent variable. 5. In an experiment designed to determine if a fertilizer increased crop yield in tomato plants, the amount of sunlight and water the plants received would be standardized variables.
There are ____ molecules of DNA in a
developing human sperm cell at the beginning of prophase I. a. 92 b. 23 c. 46 d. half as many (as compared to somatic cells) e. twice as many (as compared to mature sperm)