A saprobe differs from a parasite in that
A. a saprobe has the ability to undergo meiosis to produce sexual spores, but a parasite can only perform mitosis to produce asexual spores.
B. a saprobe has a pseudohyphae morphology, but a parasite has true hyphae.
C. a saprobe derives nutrients from dead plants and animals, but a parasite derives nutrients from living plants and animals.
D. a saprobe is a fungus, but a parasite is a protozoan.
Answer: C
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Twin studies have been used to assess the relative importance of "nature" versus "nurture" in determining variation among individuals for complex traits. Which of the following statements is not correct?
A. In principle, identical twins differ only because of environment. B. In principle, fraternal twins differ because of genotype and environment. C. Twin studies show that autism and clinical depression are not significantly influenced by genotype. D. The extent to which fraternal twins differ more from each other than identical twins differ from each other measures the effects of genotype. E. Identical twins reared apart compensates for environmental influences that may be stronger for identical twins compared to fraternal twins.
Cells that are making large quantities of proteins will have numerous ____
a. centrioles b. chromosomes c. cilia d. plastids e. ribosomes
The sex chromosome composition of a person with Klinefelter syndrome is most accurately written as
a. XXX. b. XO. c. XXY. d. XYY. e. YO.
In step "c" which bonding is the only one that is possible?
a. A with C b. G with C c. C with T d. T with G e. A with G