The American holly tree requires a "male" tree and a "female" tree to produce red berries in the winter, which indicates that the male flowers lack ________ and the female flowers lack ________
A) sepals; anthers
B) petals; carpels
C) petals; ovules
D) anthers; stamens
E) carpels; stamens
E
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Which of the following ions is most likely to cross the plasma membrane of a resting neuron?
A) K+ B) Na+ C) Ca2+ D) Cl- E) Mg2+
Would it be possible and/or appropriate to design a genetic screen to look for a gene(s) involved in homosexuality?
What will be an ideal response?
You decide to repeat the Meselson-Stahl experiment, except this time you plan to grow the E. coli cells on light 14N medium for many generations and then transfer them to heavy 15N medium and allow them to grow for 2 additional generations (2 rounds of DNA replication). If the semiconservative model of DNA replication is correct, what is the expected distribution of DNA in the density gradient after two rounds of replication?
A. One band of intermediate density and one band of heavy density. B. One band of intermediate density and one band of light density. C. One band of intermediate density. D. One band of heavy density and one band of light density. E. One band of heavy density.
Which of the following foods would be a good source of fiber?
A. whole-wheat bread B. bran cereal C. peaches D. peanuts E. All of these are good sources of fiber.