Gram-negative bacteria
A. appear purple following the Gram stain.
B. include all pathogens.
C. are generally more susceptible to antibiotics than gram-positive bacteria.
D. have a more complex cell envelope with a greater variation in chemical composition.
Answer: D
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Answer the following statements true (T) or false (F)
1. Hagfish are craniates but are not vertebrates. 2. A hagfish is a not a fish. 3. Lampreys' main body support is the notochord, not a vertebral column. 4. Sharks have cartilaginous skeletons because bone-forming ability had not yet evolved in vertebrates when they originated. 5. The swim bladder is an organ in primitive fish from which the lungs of terrestrial vertebrates developed.
Liver proteins called complement proteins circulate in the blood and are activated to destroy
microorganisms. Indicate whether the statement is true or false.
In a testcross, if all the offspring show the dominant phenotype, then the individual with the unknown genotype was
A. heterozygous recessive. B. homozygous recessive. C. heterozygous. D. a clone of the other testcross individual. E. homozygous dominant.
Mitochondria in algae are thought to have arisen from which source?
A. cyanobacteria B. anaerobic bacteria C. photosynthetic viruses D. aerobic bacteria E. Algae lack mitochondria.