Which of the following situations would NOT
result in a clumped population distribution?
a. zebras form herds to protect themselves
from predators
b. oak seeds do not fall far from their parent
tree
c. rotifer populations growing in a pond
reproduce asexually
d. in a dense population, penguins maintain a
certain space between neighborhoods to
avoid aggression and protect their territory
e. all of these situations would result in a
clumped population distribution
D
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The unique sequence of monomer subunits in a protein is the ____ structure of the protein
a. primary b. secondary c. tertiary d. quaternary e. linear
Certain cells that line the stomach synthesize a digestive enzyme and secrete it into the stomach. Which of the following processes could be responsible for its secretion?
A) endocytosis B) exocytosis C) phagocytosis D) passive transport
Insulin can activate lipid synthesis in adipose cells and block breakdown of glycogen in the liver. How could one hormone have different effects on different organs?
A. Adipose and liver cells may have unique signal transduction pathways activated by insulin. B. Adipose cells do not express the insulin receptor while liver cells do. C. Adipose and liver cells may contain different transcription factors that regulate the expression of different genes. D. Adipose and liver cells may express distinct insulin receptors.
Gastrulation is an important event in early embryonic development. Which of the following is NOT a result of gastrulation?
A) formation of three embryonic cell layers B) movement and alignment of many embryonic cells C) the formation of a gastrula D) the formation of specialized adult tissues