Which of the following statements is false regarding the characteristics of Deltaproteobacteria?
A. Certain species are anaerobic.
B. Certain species are photoheterotrophs.
C. All of the choices are correct.
D. Certain species are predators.
Answer: B
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Which impact is occurring due to global climate change? a. Sea level is decreasing due to greater rates of evaporation
b. Deciduous trees are putting out their leaves later in the spring. c. Warming of tropical waters that increase coral production. d. Spring blooming flowers are staying dormant longer. e. Increased intensity of hurricanes.
What process best characterizes Ca2+ movement from the cytosol (low Ca2+ concentration) into the endoplasmic reticulum (high Ca2+ concentration)?
A. Calcium movement occurs by passive diffusion. B. Calcium movement is spontaneous. C. Calcium movement occurs by facilitated diffusion using a transporter protein. D. Calcium movement involves active transport. E. Calcium movement does not require energy.
Which of the following is a true statement?
A. A cross between Bb and bb genotypes would lead to offspring with a 1:4 phenotypic ratio. B. An example of a homozygous individual is Bb. C. You may associate pedigrees with purebred animals, such as purebred dogs, but pedigrees cannot represent human matings. D. A testcross is a mating between an individual with a dominant phenotype (but unknown genotype) and a homozygous recessive individual.
Oxpeckers have long been thought to have a mutualistic relationship with cattle in Zimbabwe, whereby the birds remove ticks from the backs of cattle, and the cattle benefit due to the removal of parasitic ticks
The observational experiments of Weeks (2000 ) in Zimbabwe demonstrated that the relationship between oxpeckers and cattle was not mutualistic, but in fact parasitic. What two oxpecker behaviors did Weeks observe?