Chromosomes in which the normal order of a block of genes is reversed contain a(n)
A. duplication
B. insertion
C. inversion
D. reciprocal translocation
E. none of these
C
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Which fossil is the earliest known bird with a beak? a. All of these had beaks
b. Sinosauropteryx c. None of these had a beak. d. Confuciusornis e. Archaeopteryx
Which one of the following wraps around, supports, and holds organs in proper position within the body?
A) loose areolar tissue B) tendons C) ligaments D) cytoskeleton E) reticular tissue
Characteristics of Treponema pallidum, the bacterium which causes syphilis, include all except
A) vertical transmission to a fetus during any stage of pregnancy. B) ability to avoid immune detection by varying the few antigens it carries on its surface. C) not treatable with any of type antibiotic. D) rapid invasion of host tissues from the initial infection site. E) Gram-negative spirochete.
The key event that occurs during lysogenic replication of bacteriophage that does not occur during lytic replication is
A) assembly of new phage by packing viral genomes into capsids. B) penetration of the phage DNA into the host cell. C) integration of the phage DNA into the host cell DNA. D) release of mature viral particles by lysis of the bacterial cell. E) attachment of the phage to specific proteins in the bacterial cell.