Increased concentrations of CO2 (5% to 10%) and approximately 15% O2 produce an environ-mental condition that best suits which type of organism?
a. Aerobes
b. Anaerobes
c. Capnophiles
d. Microaerophiles
C
Various types of microorganisms require different atmospheric conditions. Capnophiles grow best in the presence of increased levels of CO2.
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Mammals have a family of 500 and 1000 genes that encode receptor proteins on the surface of odor-receptor neurons. If all mammals have these genes, why do some mammals have a better sense of smell than others do?
A) Some of the genes actively transcribing receptor proteins in some species are completely absent in other species. B) Some of the genes may have been mutated and rendered inactive in some species but not in others. C) Some species, particularly humans, rely much less on odor detection for survival; thus, the genes have mutated to encode proteins that aid in other senses, such as sight. D) Some species of mammals have a larger set of "basic odors" than other species.
________ use inorganic electron donors released from deep-sea hydrothermal vents
A) Chemolithotrophs B) Photoheterotrophs C) Chemoheterotrophs D) Photolithotrophs
Which of the following statements accurately describes prophase?
a. The cell appears to have a line of chromosomes across the midregion. b. The nuclear envelope becomes visible. c. The cell constructs microtubules to form a spindle. d. Chromatids separate and become known as chromosomes.
Which of the following cell types conducts water most rapidly through a plant?
A. sieve tubes B. phloem C. vessel members D. parenchyma cells E. sclerenchyma cells