In liverworts, when are the pores (not true stomata) open?
a. daytime
b. nighttime
c. they do not close
d. they are never open
c. they do not close
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Tissues present during development of an organ but not found in the fully formed organ are removed
by
a. apoptosis only. b. programed cell death only. c. molecular signals received by receptors on marked cells only. d. apoptosis and programed cell death. e. apoptosis, programed cell death, molecular signals received by receptors on marked cells.
Which statement is true about neurons?
What will be an ideal response?
Hemoglobin gives up O2 when
a. partial pressure of oxygen is lower than in the blood. b. body temperature is lowered. c. pH values are high. d. CO2 concentrations are low. e. O2 concentrations are high.
Stremtomyces are obligate aerobic soil bacteria that infect may root plants, causing scabs on their surfaces. You would expect to find more Streptomyces near the surface of the soil.
a. true b. false