Relatively small organic molecules with a central carbon atom which is bonded to a carboxyl group, an amino group, a carbon containing group, and a hydrogen atom are called:
A. amino acids.
B. fatty acids.
C. enzymes.
D. peptides.
E. nucleotides.
A
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Which of the following describes homeostasis?
a. Maintaining constant internal conditions b. Capturing energy for metabolic functions c. Inhabiting the same specific environment d. Duplicating and distributing chromosomes
The oldest fossils
a. demonstrate the widest distribution. b. represent the most highly evolved organisms. c. are found buried deeper in the ground than more modern forms. d. are found in Africa. e. are primitive marine vertebrates
Which component is responsible for initially stimulating a muscle contraction?
a) proteins b) electrochemical signals c) plasma membranes d) striations
___________, or water bears, have a reduced coelom and an external body covering. Fill in the blank(s) with the appropriate word(s)