Birth control pills are ________.
Birth control pills are ________.
(Choose all that apply)
[A] linked to an increased risk for fatal blood clots.
[B] effective within 48 hours of first use
[C] taken each day
[D] obtainable without a prescription
A and C
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The proximate causes of behavior are interactions with the environment, but behavior is ultimately shaped by _____
A) hormones B) evolution C) sexuality D) pheromones E) the nervous system
A microbiologist is working with two genera of bacteria, A and B, to determine if cells are competent. Strains are grown under optimal conditions, and DNA fragments that carry the gene for green fluorescent protein is added to each culture at 20-minute intervals. Samples from each treatment are plated to nutrient agar and incubated, after which the plates are examined under an ultraviolet lamp. The microbiologist observes that all plates of bacteria B contain colonies that are fluorescent, while for bacteria A only the plates from stationary phase demonstrate fluorescent colonies. What can be concluded from these results?
A. Competence in bacteria A is constitutively expressed. B. Competence in bacteria B is dependent on the phase of growth. C. Both bacteria A and bacteria B cells are competent. D. Neither bacteria A nor bacteria B cells are competent.
Wilcove's experimental design included
a. three forest types. b. multiple nests per habitat type. c. height from ground. d. three forest types and multiple nests per forest type. e. three forest types, multiple nests per forest type and height from ground.
Which way do ocean currents circulate in the
Northern Hemisphere?
a. counterclockwise b. clockwise c. both clockwise and counterclockwise d. neither clockwise and counterclockwise e. none of these