Which phrase describes the events that occur in the production of a pollen grain from a microspore mother cell?
a. Only meiosis occurs.
b. First mitosis occurs, and then meiosis, followed by mitosis.
c. First meiosis occurs, and then mitosis.
d. First mitosis occurs, and then meiosis.
Answer: c. First meiosis occurs, and then mitosis.
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The major physical symptom associated with Klinefelter syndrome is ____
a. facial deformation b. fertility problems c. short stature d. intellectual disability e. heart abnormalities
DNA helicase inhibitors are well studied as potential drug targets. What would you expect to see if DNA helicase activity is inhibited?
A) The replisome complex would not assemble on the oriC region. B) The DNA cannot bend, so hydrogen bonds in the 13-mer region of oriC remain intact. C) Helicase catalyzes ATP hydrolysis and DNA strands separation, so the helix cannot be unwound and strands will not separate. D) Helicase carries the SSB protein to the open region of DNA, so hydrolysis and strand separation will not occur. E) Helicase prevents reannealing of the separated strands, so strands would quickly reanneal and DNA replication cannot proceed.
The technique shown in Image B is most likely the:
a) Auramine-rhodamine b) PAS c) Kinyoun d) Thioflavin T
Dermatophytes digest the protein ________, found in the skin, hair, and nails.
Fill in the blank(s) with the appropriate word(s).