How long does it take for a biofilm to form?
a. seconds to minutes
b. minutes to hours
c. hours to days
d. days to months
e. months to years
ANSWER: d
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Which characteristics clearly separate Eukarya from Bacteria, but not Eukarya from Archaea?
What will be an ideal response?
What two processes results in genetically-different products?
A. mitosis and meiosis B. mitosis and asexual reproduction C. meiosis and asexual reproduction D. meiosis and sexual reproduction E. mitosis and sexual reproduction
In humans, the male has an X and a Y sex chromosome. The human female has two X chromosomes. In birds, the female has a Z and a W sex chromosome while the male has two Z chromosomes. Which of the following statements is accurate about which parent determines the gender of the offspring based on inheritance of the necessary sex chromosome?
A. In humans, the female determines the gender of the offspring, and in birds the male determines the gender. B. In humans and birds, the female determines the gender of all the offspring. C. In humans and birds, the male determines the gender of all the offspring. D. Determination of the gender of any human or bird offspring is related to the environmental conditions at the time of conception. E. In humans, the male determines the gender of the offspring, and in birds the female determines the gender.
You are an evolutionary biologist analyzing the evolution of embryo development in different species. You identify an important gene that controls the placement of body regions in fruit flies, mice, and chickens, and you find the gene is exactly the same
in each species. You then determine it is the enhancer sequence of the genes that is different in each species. Why would such very different species have the same gene sequence but a different enhancer sequence? What will be an ideal response?