A lung specimen from a pneumonia patient contains Gram-negative bacilli. Laboratory test results on the bacteria show they are nonmotile coliforms with a thick capsule. Which pathogen is the likely cause of the pneumonia?
A) Escherichia coli
B) Enterobacter
C) Hafnia
D) Klebsiella
E) Serratia
D
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Human diet must be varied enough to provide ____________________ of the 20 amino acids from the foods we eat
Fill in the blank(s) with correct word
A cell's DNA molecules contain its genetic material. The DNA molecule can be altered
a. by chance mismatching of base pairs. b. by damage from exposure to radioactivity. c. if the host cell is intelligent and determines that an alteration would help the cell survive. d. by chance mismatching of base pairs, by damage from exposure to radioactivity, and if the host cell is intelligent and determines that an alteration would help the cell survive. e. by chance mismatching of base pairs and by damage from exposure to radioactivity.
In humans, normal skin pigmentation is influenced
by a dominant gene (C), which allows pigmentation to develop. All individuals who are homozygous for the recessive allele (c) are unable to produce an enzyme needed for melanin formation and are therefore referred to as albino. Two normal parents produce an albino child. What are the chances that the next child will be an albino? What will be an ideal response?
Which of the following marine organisms produce potent neurotoxins that cause extensive fish kills, contaminate shellfish, and create severe respiratory irritation to humans along the shore?
A) red algae B) dinoflagellates C) diplomonads D) euglenids E) golden algae