The pacemaker for inhalation is located in the:
a. alveoli
b. bronchi
c. diaphragm
d. hypothalamus
e. medulla oblongata
e
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Access to ____ is usually the main limiting factor for growth of aquatic algae and cyanobacteria
a. iron b. hydrogen c. oxygen d. carbon e. phosphorus
Male gametophytes are produced by which of the following processes?
A. gametogenesis B. microsporophyte generation C. meiosis D. neither mitosis nor meiosis E. mitosis
Male peacocks with larger eyespots are more attractive to females than males with smaller eyespots
The two figures below show mean weight (at a certain age) and percent survival of offspring as a function of the father's eyespot size. Are these results consistent with the hypothesis that eyespots are an "honest signal?" Justify your answer. What will be an ideal response?
You need to determine if a pure culture of bacteria is gram-positive or gram-negative, but you've just spilled your only solution of crystal violet so you can't do a Gram stain. You decide to try a lysozyme treatment on a sample of each culture and then examine the samples under the microscope. The expected result is
A. gram-positives will lyse and appears as debris; gram-negatives will lose cellular morphology and appear as cocci. B. gram-negatives will lyse and appears as debris; gram-positives will be unaffected. C. gram-negatives will lyse and appears as debris; gram-positives will lose cellular morphology and appear as cocci. D. gram-positives will lyse and appears as debris; gram-negatives will lyse but more slowly. E. gram-positives will lyse and appears as debris; gram-negatives will be unaffected.