Protein filaments with a diameter of 4-7 nm that play a role in cell movement and shape change are called
A. mycelia.
B. microtubules.
C. microfilaments.
D. intermediate filaments.
Answer: C
You might also like to view...
A microbiologist would like to use a noncompetent genus of streptococcal bacteria, Enterococcus faecalis, as a cloning host to express genes from Streptococcus pneumoniae, which is naturally competent. Is this possible?
A. Yes; electroporation or chemical transformation can be used to make non-competent Streptococcus mutants, from which genes can be inserted into a cloning vector and introduced into Enterococcus. B. Yes; since the cloning host and the DNA to be introduced are both from bacteria that are streptococci, natural competence in this case is not necessary as long as the appropriate vector is used. C. Yes; electroporation or chemical transformation can be used to make Enterococcus competent, and then genes from Streptococcus can be introduced via a cloning vector. D. No; competence factor is an essential protein that enables the uptake of foreign DNA, therefore a cloning host such as Enterococcus that lacks competence factor protein is unable to be transformed by electroporation or chemical transformation.
A defect in the HoxA-3 would most likely result in
A. defects of the thyroid. B. defects of the limbs. C. an enlarged heart. D. defects of the lungs. E. abnormal positioning of the kidneys.
Charlotte liked to have a suntan all of the time, so she never wore sunscreen at the beach or in the tanning salon. During a visit to her doctor, she was told that she has the most common form of skin cancer
She will be all right, but she should avoid prolonged exposure to UV radiation in the future. Which skin cancer does she have? A) melanoma B) squamous cell carcinoma C) sebaceous carcinoma D) basal cell carcinoma
What is the most appropriate unit of measurement for macromolecular complexes including ribosomes and microfilaments?
A) centimeters B) angstroms C) micrometers D) nanometers E) picometers