Alteration of the ________ structure of a protein can transform the protein into an infectious agent known as a prion
A) secondary B) primary C) quaternary D) tertiary
Answer: A
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Which of the following statements regarding fern alternation of generations is not correct?
A. Ferns have a dominant, diploid sporophyte. B. The fern gametophyte is very small, but very hardy. C. Most fern gametophytes are capable of producing both male and female gametes. D. Chemical signals released by gametophytes producing eggs cause other, nearby gametophytes to also produce eggs. E. The diploid zygote will grow to become the sporophyte.
Four of the following are trends associated with vertebrate evolution. Which one is the exception?
a. conversion of the support for locomotion from the notochord to the vertebral column b. expansion of the nerve cord to form the brain and spinal cord c. changes in the respiratory system from gills to lungs with accompanying changes in the circulatory system d. the development of fewer, more efficient chambers in the heart e. modification of limbs that allowed for more efficient movement
The part of the brain that controls the basic
responses necessary to maintain life (such as breathing and heartbeat) is the a. medulla oblongata. b. corpus callosum. c. pineal gland. d. cerebellum. e. cerebral cortex
Which features enabled Homo erectus to be successful in Asia?
A. Higher degree of intellectual abilities. B. They were able to control fire. C. They were able to incorporate meat into their diet. D. All of these made Homo erectus successful.