Which of the following is not an autotroph?
a. yeast
b. oak tree
c. cyanobacterium
d. algae
e. grass
a. yeast
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A number of species have declined in abundance around Boston, Massachusetts, since Thoreau's time. These tend to be:
A. the plants least able to change their flowering time. B. the plants that have changed their flowering time the most. C. the plants that have the earliest flowering time. D. the plants that have the latest flowering time. E. None of the above.
Mitochondrial DNA (mtDNA) is helpful in obtaining a DNA profile for very degraded genetic material because
A) cells have many mitochondria, and therefore several copies of mtDNA sequences. B) mitochondria contain oxidative enzymes that protect the DNA. C) mtDNA consists of a single helix, so it cannot be unwound. D) it uses uracil instead of thymine, which is a more stable nitrogenous base.
Land dwelling insects do not have the ability to excrete ammonia so instead they will convert it into ________
a. urea b. urine c. plasma d. water e. uric acid
Why do organisms that share a common environment often also share common features?
a. Living in close proximity leads to inter-breeding of the species. b. They likely share common parasites as well, and the parasites are responsible for horizontal gene transfer between the species. c. Sharing a common environment means they face similar environmental pressures. d. Over time, species that cohabitate start to look alike.