What is the name of the microtubule structure that brings about chromosomal movement during nuclear division?
A) Mitotic spindle
B) Cell membrane
C) Centromere
D) Sister chromatid
Answer: A) Mitotic spindle
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Most plasmids are circular rather than linear
Indicate whether the statement is true or false.
You are investigating an abnormal eukaryotic cell line that makes all of its mRNAs much longer than the mRNAs from normal cells (that is, they have more nucleotides than usual). Intrigued, you examine the proteins in these abnormal cells and note that
many of them are either much longer or much shorter than the normal proteins from nonmutant cells. Assuming there is just one mutant defect in these cells, what is that defect? A. A stop codon is mutated. B. RNA polymerase does not recognize the terminator sequence. C. Release factor is defective. D. The spliceosome is nonfunctional. E. The enzyme that adds the poly-A tail is defective.
The common goldfish Carassius auratus has 100 chromosomes and is tetraploid. The goldfish therefore has _____ sets of chromosomes containing ______ chromosomes each
A. 4; 25 B. 2; 50 C. 4; 100 D. 1; 100
Photosynthetic organisms are essential for limiting the damage done by global warming because they
____.
a. move carbon from the atmosphere to living organisms b. move carbon from the soil to the atmosphere c. move carbon from the atmosphere to the soil d. produce oxygen e. sequester carbon in geologic sediments