In E. coli, genes make up ______ of the DNA.
A) less than 5%
B) at least 10%
C) at least 50%
D) at least 90%
E) 100%
D) at least 90%
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Which of the following actions occurs in many plants when CO2 concentrations are high?
A. Guard cells lose turgor, and the stomata close. B. Water evaporates at a higher rate than usual. C. CAM photosynthesis fixes CO2 at night. D. Oxygen is used by plants for photosynthesis. E. Calcium ions are transported faster through the phloem.
When referring to membrane glycolipids and glycoproteins, the term "glyco-" indicates ____
a. nonpolar carbohydrate groups are attached to the molecules b. polar carbohydrate groups are attached to the molecules c. the molecules are found on both the interior and exterior of the membrane d. the molecules are attached to the membrane by ionic bonds e. the molecules are rarely found on the membrane exterior
Neuromasts are always located on the fish's body surface
Indicate whether the statement is true or false.
Which of the following actions would increase enzymatic activity in a bacterial cell that normally thrives in the human body?
a. adding a second substrate that can act as a competitive inhibitor b. slightly increasing the temperature within the optimum range c. placing the bacteria in the refrigerator d. increasing the substrate level in the environment beyond saturation