The major cause of male infertility is ________________
A. varicocele D. semen disorders
B. undescended testicles E. obstructions
C. testicular failure
A
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Regardless of the DNA polymerase used in PCR, such as Taq or Pfu, they all have an inherent inability to perfectly copy the template strand, which means the polymerases themselves occasionally make mutations in the sequences they copy
Indicate whether the statement is true or false.
rRNA signature sequences can be used to place microorganisms in the correct domain.
Answer the following statement true (T) or false (F)
A scientist isolates a single-celled organism from the bottom of a sulfur hot spring. When examined under the microscope, it is clear that the cell is very small and contains no nucleus. Based on this evidence alone, in what domain of life is this organism?
A. Eukarya. B. Bacteria. C. Archaea. D. Either bacteria or archaea. E. It is impossible to determine anything based on this evidence alone.
Which of the following is the longest phase of
the cell cycle?
a. interphase b. prophase c. metaphase d. anaphase e. teleophase