Proteins are made up of many
a. RNA molecules only.
b. DNA molecules only.
c. RNA and DNA molecules.
d. nucleotides.
e. amino acids.
Answer: e. amino acids.
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Mr. Johnson was becoming slightly deaf. To test his hearing, his doctor held a vibrating tuning fork tightly against Mr. Johnson's jaw. This sent vibrations through the bones of the skull, setting the fluid in the cochlea in motion. Mr. Johnson could hear the tuning fork this way, but not when it was held away from the skull a few inches from his ear. Where was the hearing problem most likely to
be? A. auditory cortex of Mr. Johnson's brain B. auditory nerve leading to Mr. Johnson's brain C. hair cells in the cochlea D. tympanum or the bones of the middle ear E. fluid of the cochlea
Which of the following is the reason for existence of vestigial structures (useless parts of the body)?
a. They must have functioned in the near past. b. They must have functioned in ancestral organisms. c. They must have functioned in other organisms. d. They must have functioned in similar organisms.
Most human adults are lactose intolerant. People with lactose intolerance produce insufficient amounts of _______.
A. vitamins B. lactose C. saliva D. the enzyme lactase
Although having numerous component stages, a complete cell cycle consists of _____.
A) interphase, mitosis, and cytoplasmic division B) prophase, anaphase, metaphase, and telophase C) the G1, S, G2, and M stages D) mitosis and cytoplasmic division E) meiosis, mitosis, or binary fission