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 changes in a handful of amino acids.
B) The codons could shift by one letter, and all the codons after that point would be off.
C) A point mutation forms that leads to a change in one amino acid.
D) The codons shift by one letter, and all the codons before the mutation are changed.
Answer: B
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What happens to pyruvate during the process of fermentation?
A. It is oxidized to ethanol. B. It is reduced to ethanol. C. It is converted to acetyl Co-A. D. It is oxidized to lactic acid. E. It gets converted to pyruvic acid.
What is the key concept addressed by the question?
What will be an ideal response?
Aquaporins are ____
a. pores made of water molecules b. required for water to enter a cell c. found only in bacterial cells d. specific channels for water transport e. useful for cell signaling
vA physician using a microscope to examine suspect cells in biopsy tissue would expect to find each of the following characteristics in metastatic cancer cells except
A) poorly differentiated cells. B) many dividing cells. C) perfectly spherical nuclei. D) a poorly defined tumor boundary. E) a high nucleus to cytoplasmic volume ratio.