Which of the following tissue types is characterized by having cells suspended within an extracellular matrix consisting of a mixture of fibrous proteins and carbohydrates?
A. Muscle
B. Nervous
C. Epithelial
D. Connective
E. Digestive
Answer: D
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Approximately how long would it take for CO2 levels to return to nineteenth century levels if we cut emissions by 90% immediately?
A. hundreds or thousands of years B. 1 month C. 6–12 months D. 10 years E. 100 years
You find a sick plant in an arid environment. After studying it, you believe it is specifically defective in C4 photosynthesis. What nutrient might this plant be lacking?
A. Copper B. Nickel C. Molybdenum D. Sulfur E. Sodium
Which of the following proposed the "sandwich" model of membranes, in which lipid bilayers are coated on both sides with thin sheets of proteins?
A) Overton B) Langmuir C) Gorter and Grendel D) Davson and Danielli E) Robertson
What is a nucleosome?
What will be an ideal response?