Vascular plants can be divided into ____ groups according to how they complete their life cycle, particularly the dispersal phase
A. 1
B. 2
C. 3
D. 4
E. 5
B
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Multiple functional groups are able to attach to macromolecules. What is the most useful characteristic that enables the attachment of multiple functional groups?
A. One hydrogen ionic bond. B. Four carbon covalent bonds. C. Two oxygen covalent bonds. D. Three nitrogen ionic bonds.
Which of the following are incorrectly paired?
a. heroin?premature births and low birth weight b. thalidomide?babies born without toes c. accutane?associated with malformations of the brain d. cocaine?constricts fetal arteries, which leads to retarded development e. cigarette smoking-an addiction to nicotine
What would be likely to happen if a large excess amount of activated cyclin-dependent kinases were injected into cells during the G1 phase?
a) Progression to S phase would proceed at a slightly slower rate than usual. b) Progression to S phase would proceed earlier and more rapidly than usual. c) Progression to S phase would be blocked. d) Most of the E2F transcription factors would remain complexed with pRB.
Which of the following characterize B cells?
A. They are manufactured and mature in the bone marrow. B. They function in antibody mediated immunity against bacteria. C. They directly recognize antigens and undergo clonal selection. D. All of the choices characterize B cells. E. None of the choices characterize B cells.