What organisms convert gaseous nitrogen into ammonium or nitrates that can be used by plants?
a. tertiary consumers
b. nitrogen-fixing bacteria
c. fish
d. legumes
e. corn and other grains
B
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An ascus that contains two parental spores and two nonparental spores is called a tetratype
Indicate whether the statement is true or false
These structural segments in proteins provide flexibility that allows parts of the protein to bend, fold,
or move.
a. random coil b. leucine zipper c. ? sheet d. ? helix e. ? polysaccharide
Achondroplasia is a form of dwarfism in humans. It is caused by a mutant allele of the fibroblast growth factor receptor gene (FGFR) that produces an overactive protein. Having one copy of the mutant allele results in dwarfism. Two copies of the mutant allele results in death before birth. Based in this information, what can you infer about the inheritance of the FGFR alleles?
A) The mutant FGFR allele is pleiotropic. B) Some achondroplastic dwarfs are heterozygous for the mutant allele and some are homozygous. C) The wild-type and mutant FGFR alleles are codominant. D) The mutant FGFR allele shows incomplete penetrance.
Even after the angiosperms became the dominant
plants on Earth, the conifers retained a competitive edge a. at high elevations in the far north. b. in temperate northeastern coastal regions. c. in mid-continent plains. d. in southern woodlands. e. in northwestern scrub forests.