In what way is chromosomal organization within the nucleus of an interphase cell thought to be related to gene activity?
What will be an ideal response?
In general, gene-poor chromosomes are located at the nuclear periphery, whereas gene-dense chromosomes are located internally.
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Why are food chains limited to a small number of links?
What will be an ideal response?
UV rays from the sun cause a specific type of improper base pairing called a thymine dimer. If a cell cannot correct this problem, the section of DNA can be removed, causing a deletion of several nucleotides. What will this cause?
A) A point mutation forms that leads to a change in one amino acid. B) A point mutation forms that leads to changes in a handful of amino acids. C) The codons shift by one letter, and all the codons before the mutation are changed. D) The codons could shift by one letter, and all the codons after that point would be off.
Which of the following statements is false?
(a) A new RNA molecule can begin to be synthesized from a gene before the previous RNA molecule's synthesis is completed. (b) If two genes are to be expressed in a cell, these two genes can be transcribed with different efficiencies. (c) RNA polymerase is responsible for both unwinding the DNA helix and catalyzing the formation of the phosphodiester bonds between nucleotides. (d) Unlike DNA, RNA uses a uracil base and a deoxyribose sugar.
Photosynthetic electron transport in cyanobacteria takes place ________.
A. on the thylakoid membranes B. on the plasma membrane C. in the cytoplasm D. in the chloroplast