Which of the following worms lacks a digestive system?
a. filariae
b. tapeworms
c. earthworms
d. roundworms
e. leeches
Ans: b. tapeworms
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Which of the following is true of the integration of a viral genome into the host chromosome?
A. Integration begins the process of host chromosome degradation. B. Integration of the viral genome is a form of site-specific recombination. C. The enzymes that are used in integration are nonspecific for the virus and its host. D. All of the choices are correct.
New combinations of genes may be produced by
a. independent assortment. b. mutation. c. crossing over. d. sexual reproduction. e. all of these.
In the section "Investigating Life: The Battle for Position in Cacao Tree Leaves", what was the dependent variable?
A. the age of the leaf B. the percent of the leaf area damaged C. the presence or absence of endophyte spores D. the presence or absence of the pathogen Phytophthora E. the percent of the leaf area containing endophytes
"Before you just dump that enzyme-active presoak into the washing machine, be sure to ____________ so it will do a better job."
A. rub it into the stained area to increase enzyme-substrate contact B. turn up the water temperature to boiling to get the enzyme molecules moving faster C. add chlorine bleach to the enzyme D. dilute the enzyme with water