How does mitotic prophase differ from prophase I of meiosis?
a. Chromatin supercoils only in mitotic prophase.
b. The nuclear envelope disappears only in prophase I of meiosis.
c. Synapsis occurs in mitotic prophase and but not in meiotic prophase I.
d. The chromatids separate in mitotic prophase, not in prophase I of meiosis.
e. Crossing over is characteristic of prophase I of meiosis but not of mitotic prophase.
Ans: e. Crossing over is characteristic of prophase I of meiosis but not of mitotic prophase.
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The Law of Independent Assortment states that
A. Two different genes will randomly assort their alleles during the formation of haploid cells B. Two different alleles will randomly assort during the formation of haploid cells C. Two different genes will NOT randomly assort their alleles during the formation of haploid cells D. Two different genes will randomly assort their alleles during the formation of diploid cells
In the absence of calcium, binding of myosin to actin is directly blocked by ______.
A. titin B. tropomyosin C. troponin D. z lines
What happens during photorespiration?
A) The Calvin cycle produces twice as much glyceraldehyde 3-phosphate (G3P). B) The enzyme rubisco uses oxygen as its substrate for the reaction with ribulose bisphosphate. C) Ribulose bisphosphate (RuBP) is broken down into glycolate. D) A second wave of light reactions occurs to replace the Calvin cycle.
One of the questions early geneticists had to answer was how only four nucleotides can specify placement of 20 amino acids in proteins. Today we know that _________, a sequence of three adjacent nucleotides, determine the insertion of a specific amino acid in a polypeptide chain
a) codon b) karyotype c) reverse transcritption d) glycerol