A sperm cell's acrosome ________
A) contains the sperm's nucleus and is the part of the sperm that enters the egg during fertilization
B) fuses with the plasma membrane of the egg cell
C) contains enzymes that are released when the sperm encounters an egg and dissolves a hole in the jellylike matrix that surrounds the egg
D) contains the sperm's mitochondria
C
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You and your biology lab class take a field trip to a marine aquarium. Your guide is a marine biologist who studies squids. She explains to your class how squids are able to blend into their environment. She points out that squids have pouches of pigments embedded in their epithelium. The pouches are called
A. trochophores. B. spermatophores. C. lophophores. D. chromatophores. E. phytophores.
The contractile unit of a skeletal muscle fiber is a(n) ____
a. myofibril b. sarcomere c. myosin filament d. actin filament e. Z line
Which of the following processes is able to move
heat away from the body and is used by humans? a. convection b. evaporation c. conduction d. radiation e. collection
A fat contains how many fatty acids?
A. 5 B. 1 C. 2 D. 3 E. 4