The notochord is most closely associated with
the
a. nervous system.
b. digestive system.
c. skeletal system.
d. urinary system.
e. reproductive system
C
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Imagine that a deep temperate zone lake did not turn over during the spring and fall seasons. Based on the physical and biological properties of limnetic ecosystems, what would be the difference from normal seasonal turnover?
A) The lake would be uniformly cold during the winter and summer. B) The lake would fail to freeze over in winter. C) An algal bloom of algae would result every spring. D) Lakes would suffer a nutrient depletion in surface layers. E) The pH of the lake would become increasingly alkaline.
The "bead" that allows the HIV particle to attach to and enter cells is
a. made of protein. b. hidden within the virus particle. c. part of the matrix of the virus. d. made of RNA. e. designed to protect the virus's RNA.
The following F1 cross is made: BBGg × Bbgg. Which is not a possible outcome in the F2 generation?
A) BbGg B) BbGG C) BBgg D) BBGg
Which of the following structures do not help the bacteria adhere to surfaces?
A) capsule B) pili C) fimbriae D) flagella E) slime layer