The ____________________ theory describes how interactions between actin and myosin produce skeletal muscle
contractions. Fill in the blank(s) with the appropriate word(s).
ANSWER: sliding filament
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Exposure of zebrafish nuclei to meiotic cytosol resulted in phosphorylation of NEP55 and L68 proteins by cyclin-dependent kinase 2. NEP55 is a protein of the inner nuclear membrane, and L68 is a protein of the nuclear lamina
What is the most likely role of phosphorylation of these proteins in the process of mitosis? A) They enable the attachment of the spindle microtubules to kinetochore regions of the centromere. B) They are involved in the disassembly and dispersal of the nucleolus. C) They are involved in the disassembly of the nuclear envelope. D) They assist in the movement of the centrosomes to opposite sides of the nucleus.
When considering the initiation of transcription, one often finds consensus sequences located in the region of the DNA where RNA polymerase(s) binds. Which of the following is a common consensus sequence?
A) TTTTAAAA B) satellite DNAs C) TATA D) any trinucleotide repeat E) GGTTC
A population of lizards lives in a rocky area next to a desert. Some lizards are light colored and blend into the sand. Others are dark and blend into the rocks. What is likely to happen to this population of lizards over time?
A. They may remain one species as a result of stabilizing selection. B. They may remain one species as a result of directional selection. C. They may remain one species as a result of disruptive selection. D. They may evolve into two separate species as a result of disruptive selection. E. They may evolve into two separate species as a result of directional selection.
Considering the table above, which of the following is likely true?
a. Eventually pharmaceutical companies will run out of options for the development of new anti-biotics. b. Eventually pharmaceutical companies will need to come up with new categories of antibiotics that work in ways not yet conceived. c. Physicians will need to work in local and globally coordinated ways to assure that newly de-veloped antibiotics are not overprescribed. d. All of the above. e. None of the above.