Transpiration water loss occurs mostly through which of the following structures?
A. pores
B. stomata
C. epidermal cells
D. guard cells
E. vessels
B. stomata
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When considering alleles of a gene, DNA is to genotype as ______________ is/are to phenotype
A. RNA B. mutation C. proteins D. lipids E. nucleotides
Today we are living in one of the ____ periods of Earth’s history, but global climate change is occurring much ____
than ever before.
a. cooler; faster b. cooler; slower c. warmer; faster d. warmer; slower e. warmer; more unpredictably
Erectile dysfunction
a. Affects about 30 million men in the U.S. b. can be a complication of smoking. c. can be a complication of circulatory problems. d. usually affects men as they age. e. includes all of these.
At a research conference, you meet a graduate student who studies the hormonal underpinnings of mating behavior in two species of squirrel. "It turns out the difference between my two squirrel species is similar to the difference between the prairie and the montane voles," he says. You nod knowingly, and reply...
A. "Oh, so the monogamous species has a lot of serotonin and dopamine receptors in the nucleus accumbus, promoting pair bonding, and the promiscuous species doesn't?" B. "Oh, so the polyandrous species has a lot of serotonin and dopamine receptors in the nucleus accumbus, promoting pair bonding, and the promiscuous species doesn't?" C. "Oh, so the monogamous species has a lot of vasopressin and oxytocin receptors in the nucleus accumbus, promoting pair bonding, and the promiscuous species doesn't?" D. "Oh, so the promiscuous species has a lot of vasopressin and oxytocin receptors in the nucleus accumbus, blocking pair bonding, and the monogamous species doesn't?"