Why are there several structurally different pigments in the reaction centers of photosystems?
A) Excited electrons must pass through several pigments before they can be transferred to electron acceptors of the electron transport chain.
B) This arrangement enables the plant to absorb light energy of a variety of wavelengths.
C) They enable the plant to absorb more photons from light energy, all of which are at the same wavelength.
D) They enable the reaction center to excite electrons to a higher energy level.
B
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Motion that causes two bones to move further apart from each other is known as:
A. flexion B. extension C. lengthening D. rotation
Which of the following are classified as gonadotropins?
a. FSH and LH b. TSH and LH c. ACTH and FSH d. GH and LH e. ADH and oxytocin
Steroid therapy inhibits the inflammatory response which can delay wound healing.
a. true b. false
Four of the following have been an important influence on the evolution of mammals. Which one is the exception?
a. continental movement b. teeth c. competition between species d. decline of the dinosaurs e. geographic isolation