Which of the following does not result from the combination of antibodies and antigens?
a. inactivation of the pathogen
b. formation of cytotoxic T cells
c. stimulation of phagocytosis
d. inactivation of toxins
e. activation of the complement system
B
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Which of the following statements is true in DNA replication?
A) DNA polymerase unwinds the DNA at replication forks. B) Primase removes short RNA primers and replaces them with DNA. C) Ligase breaks the hydrogen bonds between complementary DNA strands. D) DNA polymerase proofreads DNA, correcting mismatched nucleotides.
About 1 male in 1,000 is born with two Y chromosomes and one X chromosome, a condition known as ________ syndrome
Fill in the blank(s) with correct word
In ____, a pair of nonidentical alleles affecting the phenotypes of a given trait are both expressed at the same time in heterozygotes.
A. pleiotropy B. polygenic inheritance C. complete dominance D. codominance E. a multiple allele system
During the Beagle journey, Darwin visited islands, allowing him to compare island species with continental species. In terms of framing his theory of evolution, why was this significant?
A. Because the island species had both similarities to their continental ancestors and unique adaptations to their island environments. B. Because the species he saw on the islands had not changed from their ancestral continental form. C. Because the island species had very low reproductive and survival rates as compared with their continental ancestors. D. Because the island species no longer shared traits with their continental ancestors.