Proteins that are composed of more than one polypeptide chain are said to have ________ structure
A) tertiary B) primary C) quaternary D) secondary
Answer: C
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Which of the following statements is incorrect concerning sister chromatids?
A. The formation of sister chromatids doubles the amount of DNA in a cell. B. Sister chromatids consist of two identical copies of a single homologue. C. Sister chromatids are held together at the centromere by kinetochore proteins. D. Sister chromatids are formed during the S phase of the cell cycle. E. Sister chromatids separate during telophase.
Which of the following enzymes is responsible for specifically transcribing tRNA in eukaryotic cells?
A) RNA polymerase I B) RNA polymerase II C) RNA polymerase III D) primase E) RNase H
What is a difference between Chlamydomonas and Ulva?
a. Only Ulva produce flagellated gametes. b. Only Ulva contains carotenoids. c. Only Ulva grows by mitosis after fertilization. d. Only Ulva contains chlorophyll.
Lipids with unsaturated fatty acids
a. decrease the fluidity of membranes. b. increase the charge associated with the inner face of a membrane. c. increase the fluidity of membranes. d. are present only on the inner side of the plasma membrane.