Which reagent is used to test for the presence of starch?
a. I2KI
b. Nile blue
c. Ninhydrin
d. Biuret
a
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Morphological characteristics are widely used for taxonomic classifications because they are ____
a. the most likely indicators of evolutionary relationships b. the most likely to represent reproductive isolation among groups c. easy to assess in living, preserved, or fossilized specimens
d. always the exact phenotypic expression of genotypes e. indicative of genetic relatedness
Which hormones are made in the ovaries?
a. estrogen and progesterone b. follicle-stimulating hormone c. oxytocin and estrogen d. prolactin e. leutinizing hormone and progesterone
The hypothalamus and pituitary link the activities of the endocrine system and nervous system by
a. neurohormones being secreted in response to the summation of neural messages that enter the hypothalamus. b. shifts in hormonal concentrations being detected by the anterior pituitary. c. pheromones being secreted as a response to photoperiodic stimuli. d. the nervous tissue of the anterior lobe of the pituitary sending stimuli to the glandular tissue of the posterior pituitary to produce hormones that will be secreted by the hypothalamus. e. direct neural connections.
Imagine that a patient is admitted to the hospital after falling from the second-story window of her apartment. Tests reveal no injuries other than some swelling in the brain. Why, then, would her breathing become irregular?
A) The blood returning to the lungs from the brain is too high in oxygen. B) Her tissues require more oxygen for healing. C) The damage to the brain is affecting the respiratory center in the medulla. D) Her swollen brain is causing a decrease in blood pressure. E) The respiratory center in the lungs is malfunctioning due to a lack of carbon dioxide.