If two genes control a trait and each has a dominant and a recessive allele, there are ____ phenotypic classes in the F2 generation
a. three
b. five
c. nine
d. sixteen
e. thirty-two
b
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Treponema pallidum ________.
A. lacks numerous biosynthetic pathways and thus has numerous nutritional requirements B. requires protein factors found in blood C. is missing several important genes essential for DNA replication D. is missing the pathway for peptidoglycan synthesis
All of the following are true of puberty EXCEPT
A. sex organs grow and mature. B. males and females tend to go through puberty at the same age. C. hormones cause changes in body structure. D. eggs and sperm begin to be produced.
Skeletal muscle cells are not typical cells because ____.
A. groups of them fuse in the embryo to form multinucleated fibers B. they are smooth C. they are hydrostatic D. they do not respond to stimuli E. they operate independently from all other body systems
The ability of glucose to repress the lac operon depends on which effector molecules?
A. cAMP B. allolactose C. starch D. tryptophan E. ADP