In modern terminology, diversity is understood to be a result of genetic variation. Sources of variation for evolution include all of the following except
A) mistakes in translation of structural genes.
B) mistakes in DNA replication.
C) translocations and mistakes in meiosis.
D) recombination at fertilization.
E) recombination by crossing over in meiosis.
Ans: A) mistakes in translation of structural genes.
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Edouard van Beneden proposed that an egg and a sperm, each containing half the complement of chromosomes found in somatic cells, fuse to produce a single cell called a(n) ______.
A. zygote B. karyotype C. embryo D. oocyte
A chemical that binds to a cell to cause its activity to change is an example of which of the following elements of cellular communication?
A. a signaling cell B. a signaling molecule C. a receptor molecule D. a responding cell E. None of these choices are correct.
A reaction involving the gain or one or more electrons is a(n) _____ reaction.
a) none of the choices is correct b) oxidation c) reduction d) elimination e) inclusion
At the molecular level, which of the following best explain heterozygous advantage and overdominance?
A. A heterozygous individual can produce more varieties of homodimer proteins B. The alleles produce two different proteins with slightly different functions C. The proteins produced by the alleles may provide a broader range of environmental tolerance, such as temperature ranges D. Infectious organisms may recognize only a specific functional protein E. All of the answers are possibilities