Australopiths show a trend toward improved upright walking, smaller teeth, and greater hand dexterity. Like other early hominins, they retained a ____
a. vertically split upper lip
b. a skull that opens to the spinal cord at the rear
c. modern human sized brain
d. chimpanzee-sized brain
e. a prehensile tail
d
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If a study of several pedigrees demonstrates that two
parents are normal but some of their children express a trait, then the trait is controlled by a a. codominant gene. b. simple dominant gene. c. recessive gene. d. sex-linked gene. e. No conclusion can be drawn.
A person with PKU controls the buildup of phenylpyruvic acid in his or her blood by restricting dietary intake of phenylalanine, thus avoiding the severe symptoms of mental retardation, slow growth rate, and early death
Yet he or she still exhibits the symptoms of fair skin and low adrenaline levels. Why?
Botulism and tetanus are caused by bacterial endospores commonly found in the soil.
Indicate whether the statement is true or false.
Which genus is resident flora of the mouth, large intestine, and, from puberty to menopause, the vagina?
A. Escherichia B. Mycobacterium C. Haemophilus D. Streptococcus E. Lactobacillus