In extremely cold regions, woody species may survive freezing temperatures by _____
A) emptying water from the vacuoles to prevent freezing
B) decreasing the numbers of phospholipids in cell membranes
C) decreasing the fluidity of all cellular membranes
D) increasing cytoplasmic levels of specific solute concentrations, such as sugars
D
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Endospore-forming bacteria like Bacillus species begin the sporulation process with an asymmetric cell division to produce two cells with different fates. One will differentiate into the endospore, and the other is the sporangium that will ultimately lyse to release the mature endospore. (Review Process Figure 4.24.) During this asymmetric cell division, one of the compartments does not receive an intact copy of the chromosome. Which compartment can function with only part of the genome and why?
A. The endospore; it is a dormant stage and requires very little to maintain its dormancy. B. The sporangium; it supports endospore development and then lyses. C. The sporangium; much of the genome is "junk DNA" and not required for endospore maturation. D. The endospore; the endospore is built from the outside via the sporangium and not from the inside.
Answer the following statements true (T) or false (F)
1.When fluid enters the collecting duct, it is called urine. 2.An endotherm typically will have a larger nasal cavity than an ectotherm of equivalent mass. 3.Urine leaves the collecting duct and travels to the ureter. 4.Fever is part of humoral immunity since the temperature of the body is controlled from the bone marrow. 5.A doctor who attempts to induce a fever in a patient might be trying to help fight a pathogen or a cancer.
Pioneer plant species are usually characterized by
a. small size. b. high dispersal rates c. slow maturation. d. high dispersal rates and high numbers of offspring e. small size, efficient dispersal mechanisms, and slow maturation.
Which nucleotide triphosphate is hydrolyzed during a cycle of microtubule assembly and disassembly?
a. ATP b. GTP c. CTP d. UTP e. TTP