When a forest is cut down, daytime temperatures rise and reduced __________ results in less rainfall. Fill in the blank(s) with the appropriate word(s)
ANSWER: transpiration
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The shark rectal gland _____
A) is involved in osmoregulation B) is responsible for excretion of undigested residue C) secretes a hypotonic solution D) concentrates electrolytes necessary for homeostasis in a hypertonic environment
A particular reaction has a negative delta G. However, this reaction takes many years to proceed in the absence of enzyme. Why is this the case?
A. This reaction does not obey the second law of thermodynamics B. This reaction does not proceed spontaneously C. The initial free energy of the reactants is much less than the final free energy of the products D. A certain amount of activation energy is required for the reaction to proceed
Review Figure 19.15 below: The lactose operon is an example of negative regulation by a repressor whose function is modulated by an inducer
A. true B. false
Although choanoflagellates are fundamentally unicellular organisms, they possess the genes that code for cadherins and integrins
Which of the following hypotheses regarding the function of these molecules in choanoflagellates is supported by laboratory experiments? A. Choanoflagellates use adhesion molecules to facilitate the capture of bacterial prey. B. The genes are not actually expressed and are simply vestiges of an ancestor that used cadherins and integrins for adhesion. C. Cadherins and integrins are used for cell adhesion during the formation of temporary multicellular structures to defend against predators. D. Cadherins and integrins are used for cell adhesion during the formation of complex multicellular structures that are resistant to freezing temperatures. E. Choanoflagellates are parasites and use cadherins to attach to host organisms.