According to the sliding filament model of muscle contraction, a sarcomere contracts when its
A) thick filaments slide across its Z lines.
B) thin filaments slide across its Z lines.
C) thin filaments slide along its thick filaments.
D) thick filaments move closer together.
Answer: C
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Which of the following best describes a species' niche?
A. where it lives B. what it eats C. all of the climatic conditions to which it is adapted D. with whom it reproduces E. its habitat and how it uses available resources in that habitat
The chemical structure of chlorophyll is based on a complex organic ring structure, with a long hydrophobic side
chain and a(n) ____ atom in the center of the ring.
a. carbon b. manganese c. magnesium d. iron e. nitrogen
The chorion of amniotic eggs functions in:
a. supply of food. b. removal of wastes. c. gas exchange. d. protection of the egg. e. absorbing toxins.
Which of the following male organisms do. NOT contain XY chromosomes?
a. mice b. fruit flies c. horses d. pigs e. moths