Which of the following statements is false?
a. A heart will stop beating when the nerves to the heart are severed.
b. Some cardiac muscle cells are self-excitatory.
c. The pacemaker of the heart is the sinoatrial node.
d. Cardiac muscles join end to end to allow rapid communication.
e. Cardiac muscles contract essentially in unison.
A
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The initial amino acid incorporated into a nascent peptide is N-formylated in
A) eukaryotic translation. B) prokaryotic transcription. C) prokaryotic translation. D) both eukaryotic and prokaryotic translation. E) both transcription and translation in prokaryotes.
How would you classify an organism that consumes and digests both plant and animal sources of nutrients?
A) Herbivore B) Omnivore C) Carnivore D) Ruminant
Sexual dimorphism has arisen as a result of ____.
A. stabilizing selection B. heterozygote superiority C. kin selection D. sexual selection E. directional selection
Many vitamins are important ________ of enzymes
A) protein cofactors B) coenzymes C) allosteric inhibitors D) competitive inhibitors E) activators