Figure 23.12
?
The accompanying figure illustrates the life cycle of a(n) ____.
A. zygomycete
B. ascomycete
C. basidiomycete
D. glomeromycete
E. lichen
Answer: C
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Many eukaryotes have a DNA glycosylase that specifically removes T residues from DNA when paired with G. Why is it better to repair the G-T pairing to G-C by removing the T than to remove the G and form an A-T pair?
A. G-C pairs can form three hydrogen bonds between them and are therefore stronger. B. Oxidative damage to guanine by alkylation is the most common reason for G-T pairs, so removal of the T will maintain the original G-C pair. C. T bases easily tautomerize into C bases, so removing the T will make sure the pair stays in its original form. D. G-C basepairs occur more frequently in cells. E. All of the choices provided are potential reasons.
Use the table to answer the corresponding question(s)
Species Pairs Percent Divergence in a Selected DNA Sequence Human?chimpanzee 1.7 Human?gorilla 1.8 Human?orangutan 3.3 Human?gibbon 4.3 Human?rhesus monkey (Old World monkey) 7.0 Human?spider monkey (New World monkey) 10.8 Human?tarsier 24.6Based on the data in Table 18-1, which of the following primates is the most distantly related to humans? a. chimpanzee b. gorilla c. rhesus monkey d. gibbon e. orangutan
Releasing and inhibiting hormones from the hypothalamus are carried to the anterior pituitary gland by the ________
Fill in the blank(s) with correct word
Organisms that require high salt concentrations for growth are called
A. thermophiles. B. obligate halophiles. C. acidophiles. D. anaerobes.