Most organisms are dependent upon plants
because
a. plants produce oxygen as a by-product of
photosynthesis.
b. as producers, they form the base of food
chains.
c. they function to prevent erosion and reduce
desertification.
d. as they remove carbon dioxide from the
atmosphere, they reduce the problems
generated by the greenhouse effect.
e. all of these apply
E
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A phenomenon known as ________ [two words] occurs under conditions where a selection pressure works against deleterious mutations, resulting in the corresponding decrease in the frequency of a closely linked neutral mutation
Fill in the blank(s) with correct word
Which of the following structures of proteins is composed of two or more polypeptide chains?
A) secondary B) quaternary C) tertiary D) primary
Which of the following is NOT a characteristic of spirochetes?
A) possess an axial filament B) gram-negative C) helical shape D) easily observed with brightfield microscopy E) found in the human oral cavity
The following segment of DNA is from a transcribed region of a chromosome. You know that RNA polymerase moves from left to right along this piece of DNA,
that the promoter for this gene is to the left of the DNA shown, and that this entire region of DNA is made into RNA. 5?-GGCATGGCAATATTGTAGTA-3? 3?-CCGTACCGTTATAACATCAT-5? Given this information, a student claims that the RNA produced from this DNA is: 3?-GGCATGGCAATATTGTAGTA-5? Give two reasons why this answer is incorrect.