Birds differ from earlier vertebrates by
a. their lack of scales.
b. producing land eggs.
c. the ability to maintain a constant body
temperature through metabolic activities.
d. the ability to fertilize eggs internally.
e. their possession of a dorsal nerve cord.
Answer: c
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A. DNA B. starch C. amylose D. cellulose
Oxytocin affects the:
a. uterine wall b. voluntary muscles throughout the body c. nervous tissue d. target cells in the brain e. target cells in the digestive tract
Transposons are
A) proteins that are stable. B) proteins that are unstable. C) DNA segments that are stable. D) DNA segments that are unstable. E) DNA segments that code for proteins.
All cells possess all of the following components EXCEPT
A) a nuclear membrane. B) ribosomes. C) a plasma cell membrane. D) cytoplasm. E) genetic material (DNA or RNA).