If you placed a coleoptile in unidirectional light and then immediately covered the tip, which of the
following would happen?
a. The coleoptile would bend toward the light.
b. The coleoptile would not bend.
c. The coleoptile would bend away from the light.
d. The coleoptile would die.
e. The coleoptile would grow in a spiral pattern.
B
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In vertebrate animals, spermatogenesis and oogenesis differ in that _____
A) oogenesis begins at the onset of sexual maturity, whereas spermatogenesis begins during embryonic development B) oogenesis produces four functional haploid cells, whereas spermatogenesis produces only one functional spermatozoon C) cytokinesis is unequal in oogenesis, whereas it is equal in spermatogenesis D) oogenesis ends at menopause, whereas spermatogenesis is finished before birth E) spermatogenesis is not completed until after fertilization occurs, but oogenesis is completed by the time a girl is born
Which of the following is NOT a part of the MAP kinase pathway? (Select all correct choices.)
A. A receptor kinase is activated by binding to a growth factor and phosphorylates receptor cytoplasmic domains. B. The activated receptor kinase dimer activates the RAS protein to bind to a GTP. C. The activated RAS protein activates protein kinases in the signal-transduction pathway. D. A series of protein kinases amplify the signal to the nucleus where genes responsible for cell division are switched on. E. A pyrophosphatase enzyme terminates the cellular response.
Which of the following sequences correctly describes the movement of air in a bird's respiratory system?
a. lungs; anterior air sacs; posterior air sacs b. anterior air sacs; posterior air sac; lungs c. posterior air sacs; lungs; anterior air sacs
d. lungs; posterior air sacs; anterior air sacs e. anterior air sacs; lungs; posterior air sacs
What is the genetic function of restriction enzyme?
A. adds new nucleotides to the growing strand of DNA B. joins nucleotides during replication C. repairs breaks in sugar-phosphate backbones D. joins nucleotides during transcription E. cleaves nucleic acids at specific sites