Which of the following is primarily responsible for the maternal effect?
A. Sperm cells
B. Oocytes
C. Nurse cells
D. Placenta
C
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You are exploring a distant planet and find an interesting ecosystem in a lake of liquid methane. Tiny organisms, which you call “quiddles”, are able to use the methane to produce carbon sugars. Other organisms, (widdles), consume the quiddles. You discover that an average widdle weighs three times as much as an average quiddle, and that there are more widdles than quiddles per square meter of the lake. How would you describe the ecological pyramids based on these results?
A. An inverted pyramid of energy, and an inverted pyramid of biomass B. A standard pyramid of numbers, and a standard pyramid of biomass C. An inverted pyramid of numbers, and an inverted pyramid of biomass D. A standard pyramid of numbers, and an inverted pyramid of biomass
If a spontaneous mutation introduced a new allele into a population's gene pool at a chromosomal locus that had previously been static, which of the following would experience the largest change in value as a result?
(A) Average number of gene loci per chromosome (B) Average frequency of heterozygosity in the gene pool (C) Nucleotide base-pairing variability at the site of the wobble effect in codon-anticodon recognition (D) Geographic variability
Supercoiling has been observed in:
A. chromosomal DNA. B plasmid DNA. C. genomes of double-stranded DNA viruses. D. most circumstances where double-stranded DNA is present in the cell. E. most circumstances of double-stranded cellular DNA, but not double-stranded viral DNA.
During sexual reproduction in zygomycetes two hyphae will fuse to form a ________ that is ________ in its genetic material
a. spore, haploid b. zygospore, diploid c. zygospore, dikaryotic d. zygote, dikaryotic e. zygospore, haploid