Discuss how environmental factors can have a negative impact on the development of a fetus. What will be an ideal response?
Concepts to Consider: Teratogens are drugs or other substances that cause malformations in
the embryo. Smoking, alcohol, and poor nutrition can lead to low birth weight and even
infant death. Pathogens, gases, drugs, nutrients, and chemicals can all be transported across
the placenta and affect the fetus.
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Which of the following organisms is the most common cause of urethritis?
A) Candida albicans B) Chlamydia trachomatis C) Neisseria gonorrhoeae D) Trichomonas vaginalis
All of the following are true of gene therapy except
a. gene therapy could be used to treat inherited disorders. b. viruses are used to deliver genes to target cells. c. cystic fibrosis has been successfully treated by gene therapy. d. gene addition incorporates an additional gene into target cells. e. gene correction corrects the gene mutation in the target cells.
You buy a bunch of small, round, red radishes at the grocery store; they are on sale because they have been sitting in the produce aisle for a while. When you get home you remove the stems and clean them. With the first bite, you notice their texture is not as crisp and crunchy as you like. Your friend says you should refrigerate them in a bowl of water overnight. The next day the radishes are crisp and crunchy again. What is the most likely explanation of why they became crunchy again after soaking in water?
a. The radish cells were hypertonic to the water in which they were soaking. So, the water moved by osmosis across the plasma membranes into the radish cells increasing the turgor pressure inside of the cells and making them crunchier. b. The radish cells were hypotonic to the water in which they were soaking. So, the water osmosed across the plasma membranes out of the radish cells decreasing the turgor pressure inside of the cells and making them crunchier. c. The radish cells were hypertonic to the water in which they were soaking. So, the water osmosed across the plasma membranes into the radish cells decreasing the turgor pressure inside of the cells. d. The radish cells were hypotonic to the water in which they were soaking. So, the water osmosed across the plasma membranes into the radish cells decreasing the turgor pressure inside of the cells.
What is the main function of the colon?
A) to control nutrients it will send to the rest of the body B) to absorb water and vitamin K C) to complete the digestion of lipids D) to digest and absorb carbohydrates