The number of similarities in certain DNA or RNA nucleotide or amino acid sequences may be used

as a molecular clock to indicate how much time has passed since the groups branched from a common
ancestor.
__________________ Indicate whether the statement is true or false.


F, differences

Biology & Microbiology

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What characteristic distinguished Progymnosperms from conifers?

a. a single megaspore within the antheridium b. the ability to hibernate during droughts c. reproduction via spore dispersal d. a strobilus containing a single megaspore

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Bacteria causes acne by

a. infecting the epidermis. b. infecting the ducts of sweat glands. c. infecting hair follicles. d. infecting subcutaneous tissue. e. infecting the ducts of oil glands.

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A primary immune response is the ________

A) production of primary-type antibodies in the first day of exposure to a microorganism B) immune response elicited by the second exposure of lymphocytes to a particular antigen C) immune response elicited by the first exposure of lymphocytes to a particular antigen D) immune response elicited by the first exposure of memory cells to a particular antigen

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The first goal of the Human Genome Project was to 

A. construct chromosome maps for the entire human genome. B. understand the meiotic process. C. cure all human genetic diseases. D. determine the structure of DNA.

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