What structure caps the head of a mature sperm and enables the sperm to penetrate an egg?
A. axoneme
B. acrosome
C. nucleus
D. mitochondria
E. flagellum
Answer: B. acrosome
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ADH is produced in the _______.
A) hypothalamus. B) posterior pituitary. C) anterior pituitary. D) adrenal cortex.
Cardiac muscle cells and skeletal muscle cells differ in a few ways. Which of the following is not one of them?
A) Cardiac muscle cells are smaller in size. B) Cardiac muscle cells have a single, centered nucleus. C) Cardiac muscle cells branch. D) Skeletal muscle cells lack intercalated discs. E) Cardiac muscle cells lack transverse tubules.
Anterior is to ________ as posterior is to dorsal.
A) cranial B) ventral C) caudal D) inferior E) medial
The probability of a reaction occurring is increased
A. by decreasing reactant concentrations. B. by increasing the activation energy. C. by increasing the concentration of any of the products. D. if the reaction uses a great deal of energy. E. if the concentration of one of the reactants increases.