After dinosaurs became extinct, the number of mammal species increased greatly. What process applies to this example?
A) adaptive radiation
B) endosymbiosis
C) competition
D) eukaryotic development
A
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Why do X-linked disorders affect males more often than females?
a. The disorders are lethal in female embryos so affected females are unseen b. Females that carry the trait usually have one functional allele. c. Carrier mothers pass the mutated allele to all their sons. d. Affected fathers pass the X-linked recessive allele to all their sons.
What is the male sexual structure that produces sperm in plants?
a. antheridium b. archegonium c. sporangium d. strobilus e. stoma
In an atom with a neutral overall charge, the number of protons is equal to the ________.
A. number of electrons minus the number of neutrons B. atomic mass C. number of electrons plus the number of neutrons D. number of electrons
Transcriptional activation of the lac operon requires both high lactose and low glucose conditions because:a
RNA polymerase requires CAP in order to bind to the lac operon promoter, even in the absence of the repressor. b. glucose normally activates the lac operon repressor. c. RNA polymerase is inactive in the presence of high glucose concentrations. d. high glucose concentrations stimulate CAP activity. e. glucose and lactose compete for binding to, and inactivation of, the lac operon repressor.