You are examining an ecosystem and notice a large insect. When you measure its temperature, you find it to be constant in sun or shade, wind or still air. This indicates that this is, unexpectedly, an insect which is a(n)
What will be an ideal response?
endotherm.
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Agrobacterium tumefaciens can form root nodules in plants and can mate with bacteria, which makes it an excellent host organism for genetic transformations among different domains of life
Indicate whether the statement is true or false.
Members of the phylum ____ are called acorn worms. They use their mucus-coated proboscis to
construct U-shaped burrows to trap food particles, and also trap food from water passed through gill slits in their pharynx.
a. Hemichordata b. Echinodermata c. Cnidaria d. Arthropoda e. Chordata
Which of the following is not true of specialized transduction?
A. The phage genome retains the full complement of phage genes. B. It is restricted to those genes on either side of an integrated prophage. C. It is carried out by temperate phage. D. All of the choices are correct.
In some species, such as Steller sea lions, a sexual polymorphism for longevity is observed, with females liv-ing on average several years longer than males. Use an evolutionary explanation of senescence to explain this polymorphism
a. Males have a higher mutation rate than females. b. Males have higher age-specific fertility at older ages than females. c. Sexual selection imposes a more severe trade-off between fitness and longevity in males than in females. d. Males do not need to live as long as females to attain the same fitness.