Which of the following is true regarding current scientific thought?
a. DNA originated before RNA.
b. RNA originated before DNA.
c. RNA and DNA originated at the same time.
d. RNA and DNA are the same thing.
Ans: b. RNA originated before DNA.
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In Drosophila, a mutation in a gene for a bicoid transporter gene could result in which of the following?
A. offspring with no head B. offspring with no spiracles C. offspring with two heads and no spiracles D. offspring with the location of the head and spiracles reversed E. offspring with no head and two spiracles
The characteristics of a pathogen that determine its virulence include which of the following?
A. Infectivity B. Invasiveness C. Pathogenicity D. All of the choices are correct.
Although artificial selection may seem slow and unreliable, ____________________ observed that after only a few generations, breeders produced many varieties of pigeons and minks
Fill in the blank(s) with correct word
Which of the following is commonly the source of leptospirosis?
A) infected animal urine B) infected animal bites C) humans infected with leptospirosis D) infected animal feces E) infected human urine