In the sliding filament model of muscle contraction, I bands contain
A) thick filaments.
B) thin filaments.
C) myosin.
D) sacrcomeres.
E) both thick and thin filaments.
B) thin filaments.
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The correct sequence of events in the development of chordates is _____
A) cleavage, gastrulation, organogenesis, and then formation of a blastula B) gastrulation, formation of a blastula, cleavage, and then organogenesis C) cleavage, formation of a blastula, gastrulation, and then organogenesis D) gastrulation, organogenesis, formation of a blastula, and then cleavage
A mouse senses that a cat is nearby, and its body begins to produce epinephrine as part of the fight-or-flight response. Which of the mouse's glands secretes epinephrine? Select all correct choices
A. the pituitary gland B. the thyroid gland C. the parathyroid glands D. the adrenal glands E. the pineal gland
Answer the following statements true (T) or false (F)
1. Some algae are more closely related to plants than they are to other algae. 2. Protozoa are monophyletic. 3. The supergroup Excavata contain some of Earth's most recent eukaryotes. 4. Metaboly is a reduced level of metabolism that allows protists to remain dormant under stressful environments. 5. Paramylon are stored particles of carbohydrate.
________ is the male sex hormone responsible for secondary sexual characteristics.
Fill in the blank(s) with the appropriate word(s).