Which is mismatched?
A. Tapeworm - cestode
B. Whipworm - trematode
C. Fluke - trematode
D. Threadworm - nematode
E. Pinworm - nematode
Answer: B
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Muscle cells are multinucleate meaning that multiple nuclei are present in the cytoplasm of a large cell. Predict what is different about the cell cycle in a muscle cell
A. The G1 and G2 phases are extended. B. Cytokinesis does not occur. C. S phase happens twice. D. M phase is inhibited.
Variation in rates of cell division is regulated by a cell-cycle control system, which is a group of molecules, mostly proteins, within a cell that coordinates the events of the cell cycle. This control system functions through a system of checkpoints. Which assessment occurs at theG1/Scheckpoint?
A) DNA is checked for damage before entering mitosis. B) DNA is checked for damage before cell division. C) Correct alignment of chromosomes on the metaphase plate is checked. D) Tension in the spindle fibers is evaluated. E) Daughter cells are checked for replication errors.
Which of the following is not a reason we become shorter as we age?
a. As a person ages, the intervertebral discs become thinner and the vertebrae will be stacked closer together, resulting in shorter stature. b. As a person ages, vertebral bodies lose bone mass (osteoporosis) resulting in smaller vertebrae that stack closer together. c. As a person ages, scoliosis may develop resulting in an abnormal spinal curvature and shorter stature. d. As a person ages, the ligaments connecting vertebrae together are weakened, resulting in a more pronounced kyphosis. This posterior curvature of the spine lowers the skull, making you shorter.
The yeast genome was sequenced more than 15 years ago, yet the total number of genes continues to be refined
The sequencing of closely related yeast species was important for validating the identity of short (less than 100 nucleotides long) open reading frames (ORFs) that were otherwise difficult to predict. What is the main reason that these short ORFs are hard to find without the genomes of other yeast for comparison? (a) Short ORFs are found only in yeast. (b) The short ORFs code for RNAs. (c) Many short stretches of DNA may lack a stop codon simply by chance, making it difficult to distinguish those DNA sequences that code for proteins from those that do not. (d) Short ORFs occur mainly in gene-rich regions, making them difficult to identify by computer programs.