Why do organisms molt their exoskeleton and grow new ones periodically?
What will be an ideal response?
An exoskeleton consists of noncellular secreted material, so it cannot grow with the animal. As an organism grows, it must periodically molt its old skeleton and replace it with a larger one.
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Which of the following statements about energy from the Sun is correct?
A. the surface temperature of the sun is about 6000 degrees Fahrenheit B. about 4% of the suns radiation is in the visible light spectrum C. on an energy distribution curve, the sun's emissions peak around .5 micrometers D. earth acts as a blackbody because of it's dark color E. the earth emits shorter-wave radiation than the sun
Which process listed below does NOT require homologous recombination to maintain the new genetic material in the recipient cell?
A) conjugation of an F+ plasmid B) gene transfer through a genetic transfer agent C) transduction by a dsDNA phage Mu D) transformation of a linear piece of DNA
Silica walls are characteristic of
A. diatoms. B. slime molds. C. euglenoids. D. red algae. E. brown algae.
Cortisol and aldosterone are secreted by the ________
Fill in the blank(s) with correct word