Which one of the following is true? A codon _____
A) consists of four nucleotides
B) can code for up to four different amino acids
C) extends from one end of a tRNA molecule
D) is the basic unit of the genetic code
Answer: D
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______ is the observable response of organisms to external or internal stimuli.
A. Ecology B. Behavioral ecology C. Behavior D. Pheromonal mediation E. Allomonal mediation
If an embryo doesn't have an exact multiple of the normal haploid number of 23 chromosomes, the
condition is known as a. aneuploidy. b. diploidy. c. ahaploidy. d. multiploidy. e. synploidy.
The stapes is directly connected to the ____
a. cochlea b. oval window c. tympanic membrane d. round window e. auditory nerve
Which of the following is NOT a risk factor associated with cancer?
A. Advanced age B. Smoking cigarettes C. Family history of cancer D. Viral infections E. All of these are risk factors associated with cancer