Genetic maps are constructed by estimating the distances between linked genes based on the calculation of
____________________. Fill in the blank(s) with the appropriate word(s).
recombination frequencies
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Why is it unlikely that DNA was NOT the first
self-replicating molecule of life?
a. nitrogen is essential for constructing DNA and there was no nitrogen on early Earth b. DNA is hyper-sensitive to oxygen and would have disassembled quickly in its presence c. DNA requires proteins like DNA polymerase for assembly so it doesn’t truly “self-replicate” d. it must have RNA to self-replicate and RNA evolved much later in life’s history e. more than one of these is correct
Which of the following questions might scientists ask to most reliably determine if there has ever been life on Mars?
(A) How far from Earth was Mars 3.5 billion years ago? (B) Is there scientific proof that Earth ever hadan oxygen-free atmosphere? (C) Did Mars have the elements present in its atmosphere to support life? (D) Was there oxygen gas on Mars 3.5 billion years ago?
Identify the bacterial shape pictured: O
A) coccus B) pleomorph C) spirochete D) bacillus
A person whose ancestors were cattle herders is more likely to express the lactase gene as an adult.
Answer the following statement true (T) or false (F)