Which one of the following is the external structure of the ear that enhances reception of sound waves?
A. tympanic membrane
B. oval window
C. cochlea
D. pinna
D
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Because small quantities of powerful explosives can be hidden easily, a sensor that could detect trace amounts of illicit chemicals would be a useful tool. What animal sensory modality is exquisitely sensitive to minute quantities of airborne chemicals?
Honeybees have an incredible ability to distinguish thousands of different odorant molecules, using their large repertoire of olfactory receptors. A wide variety of different types of chemicals can be detected as odorants -- they simply require olfactory neurons with a receptor that can bind the chemical and transduce that stimulus into a receptor potential. A. olfaction B. taste C. vision D. hearing E. touch
The hormone __________ is indicated at “D.”
a. PRL b. LH c. oxytocin d. ADH e. TSH
Which of the following lymphocytes secretes large quantities of antibodies?
A) B cells B) T cells C) Natural killer cells D) All of the above
The "big bang" refers to
A. an event marking the beginning of the universe. B. the extinction of the dinosaurs. C. the inevitable end of the universe. D. the collision of the first galaxies forming the universe as it is today. E. the inevitable death of large stars.