How many questions are needed in this dichotomous key to determine if the unknown is Bacteroides?
a. Four
b. Three
c. Five
d. Two
Answer: b. Three
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Island species are especially vulnerable to extinction because may destroy a small island population.
A. the introduction of a new predator B. a single event like a hurricane C. random fluctuations in birth and death rates D. All of the answer choices are correct. E. the extinction of a prey species
Which of the following is NOT true of the
genetic code?
a. It is the same for almost all organisms. b. There are 64 codons. c. It has within it 5 stop codons. d. Most amino acids have more than one codon that codes for it. e. Each codon is made up of three nucleotides
The first known primates were characterized as
a. arboreal and nocturnal. b. ground-dwelling and nocturnal. c. arboreal and diurnal. d. ground-dwelling and diurnal. e. none of these.
Skin color in humans is a(n) ____________________ trait.Fill in the blank(s) with the appropriate word(s)