Treacher-Collins Syndrome may include any of the following, EXCEPT
A. Blindness
B. Colobomas
C. Malformed External Auditory Meatus
D. Slanted Palpebral Fissures
E. Small Mandible
Ans: A. Blindness
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During the Beagle journey, Darwin visited islands, allowing him to compare island species with continental species. In terms of framing his theory of evolution, why was this significant?
A. Because the island species had both similarities to their continental ancestors and unique adaptations to their island environments. B. Because the island species no longer shared traits with their continental ancestors. C. Because the species he saw on the islands had not changed from their ancestral continental form. D. Because the island species had very low reproductive and survival rates as compared with their continental ancestors.
An earthworm detects sound ____
a. through specialized tympanic membranes located near the head b. through a thinned region of the exoskeleton that forms a tympanum c. through general mechanoreceptors on its skin d. by using a specialized organ that measures the frequency of vibration of the surrounding dirt particles e. through a series of mechanoreceptors arranged in a lateral line
In which of the following blood vessels would
pressure be the least?
a. arterioles serving skeletal muscles b. venules serving skeletal muscles c. the aorta d. the pulmonary artery e. the vena cavae
In bacteria, the function of IF-2 is
a. to prevent premature binding of the 50S ribosomal subunit. b. to assist the entry of the initiator tRNA into the ribosome. c. to facilitate the binding of the 30S ribosomal subunit to mRNA. d. to prevent entry of aminoacyl-tRNA into the A site. e. to stabilize the 30S ribosomal subunit.