In which of these organs does a carrier of typhoid bacilli maintain the bacteria?
A. liver
B. gallbladder
C. Peyer's patches
D. colon
E. liver AND Peyer's patches
B.
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In almost all organisms that have been studied, the genes in Hox clusters:
A. are arranged on chromosomes in the same order as their products function along the anterior-posterior segments of the embryo. B. are expressed in a sequence that is independent of their linear organization along the chromosome. C. each contain a unique homeodomain, the the products of which are very different among organisms. D. are arranged on the chromosomes in a sequence that is independent of the order in which their products function along the anterior-posterior axis of the embryo. E. None of these choices are correct.
In June 2001 an announcement was made that a draft sequence of the ____________________ nucleotides in the
human genome had been finished. a. 350 million b. 990 million c. 1.1 billion d. 3.2 billion e. 56 billion
Answer the following questions true (T) or false (F)
1. An ovarian follicle is a developing oocyte and the follicular cells surrounding it. 2. Corpus luteum translates as "yellow body." 3. Menstruation refers to the later life cessation of the monthly ovarian cycle.
Can two different species that are members of the same clade have more than one common ancestor? Choose the MOST correct answer and explanation.
A. Yes. Although two species in the same clade have only one most recent common ancestor, they also have a number of older common ancestors that occurred earlier in their evolutionary history. B. Maybe. Two species in the same clade can have more than one common ancestor only in cases where horizontal gene transfer from a third, previously unrelated, species has occurred. C. Yes. Two species of the same clade always have eight common ancestors, matching the number of levels higher than species in the taxonomic hierarchy. D. Maybe. If they are members of a paraphyletic clade, they can have more than one common ancestor. E. No. Because they are members of a clade, by definition they can have only one common ancestor.