Imagine you are a doctor and you are presented with a female patient who has been unable to get pregnant despite 2 years of trying with the same partner. Rank the following factors from most important (#1) to least important (#4) in your determination of the cause of her apparent infertility.____ Her hormone levels____ Her age____ Her STD history____ Her partner's age
What will be an ideal response?
| 3 | Her hormone levels |
| 1 | Her age |
| 2 | Her STD history |
| 4 | Her partner's age |
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Bacterial mating (or conjugation) is a bidirectional process where nucleic acids (DNA or RNA) are transferred between two cells
Indicate whether the statement is true or false.
Conjugation is a process by which bacterial cells ____
a. transfer DNA from one cell to another through a cytoplasmic bridge b. release DNA into their surroundings to be taken up by neighboring bacteria c. disrupt each other by lysing cell membranes d. are infected with a virus e. use a bacteriophage to carry DNA from one bacterium to another
In a certain bird species, clutch size (the number of eggs laid by a female in one breeding season) ranges from four to eight, and the most frequent clutch size is six. This phenomenon is an example of
a. sexual selection. b. stabilizing selection. c. disruptive selection. d. directional selection. e. artificial selection.
The generally accepted explanation for the movement of organic compounds in phloem is ____.
A. the cohesion-tension theory B. the pressure flow theory C. active transport D. the transpiration-pull theory E. root pressure