Which two observations led Darwin to conclude that there is competition for survival?
A. Fossils and mutations
B. Overproduction of organisms and limited food resources
C. Gene and allele differences in organisms
D. Natural selection and descent with modification
Answer: B
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Which type of receptor undergoes a conformational change upon activation? (Select all correct choices.)
A. G protein-coupled receptor B. receptor kinase C. ligand-gated ion channel D. nuclear receptor
Seagrasses are important in all the following except:
a. nutrient recycling. b. providing a habitat for animals. c. stabilizing sediments. d. being consumed by most estuarine herbivores.
Which of the following is TRUE about "type 1
diabetes"?
a. Insulin levels are normal. b. Target cells do not respond to insulin. c. It is the more common form of diabetes. d. It is usually controlled with a strict diet. e. It usually occurs in early childhood.
The coupled G protein most likely interacts with this receptor _____
A) at the NH3 end B) at the COO– end C) along the exterior margin D) at the loop between H5 and H6