Thalidomide, an anticonvulsive and antihistamine medication, was shown to cause severely deformed limbs in children whose mothers took the medication. What might thalidomide do during development?
A. Cause a defect in the fertilization of an egg.
B. Severely alter blastulation in the embryo.
C. Impair morphogenetic fields within the embryo.
D. Impair neural tube formation.
E. Block cell division during blastulation.
C. Impair morphogenetic fields within the embryo.
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How do nastic movements differ from tropisms?
A. Nastic movements are slower than tropisms. B. Nastic movements only occur in the dark. C. Tropisms are directional responses to directional stimuli; nastic movements are the same regardless of the direction of the stimulus. D. Nastic movements happen after a stimulus, tropisms happen during a stimulus. E. Nastic movements are not reversible.
The rabies virus is transmitted to humans by
A. contamination of scratches with saliva from an infected animal. B. the bite of an infected animal. C. aerosols of the virus that can be present in caves where bats roost. D. All of the choices are correct.
Which of the following is mismatched?
a. flagellated protozoans: trypanosomes b. alveolates: ciliates c. gren algae: diatoms d. stramenopiles: brown algae e. amoebozoa: slime molds
In plants like the fern, haploid cells produced by meiosis divide by ________, forming a multicellular haploid phase.
A. budding B. mitosis C. meiosis D. binary fission