Unlike skeletal muscle, cardiac muscle is:
A) striated voluntary.
B) nonstriated voluntary.
C) nonstriated involuntary.
D) striated involuntary.
Ans: D) striated involuntary.
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Which of the following can be used to carry foreign DNA into host cells? Choose all correct answers
a. RNA b. viruses c. PCR d. plasmids e. lipid clusters f. blasts of pellets g. xenotransplantation h. sequencing
Many coenzymes are which type of molecule?
a. lipids b. sugars c. carbohydrates d. vitamins
e. proteinsEpidemiologists classify diseases by their mortality rate (the percent of infected individuals who die from the disease) and by their communicability (how easy it is to transmit the disease). Which of the following diseases of the cardiovascular system is mismatched with a description of its properties?
A. Plague; somewhat high mortality rate and low communicability B. Ebola; high mortality rate and high communicability C. Malaria; low mortality rate and high communicability D. AIDS; high mortality rate and low communicability
Which of the following is not a general mechanism that cells use to maintain stable patterns of gene expression as cells divide?
(a) a positive feedback loop, mediated by a transcriptional regulator that activates transcription of its own gene in addition to other cell-type-specific genes (b) faithful propagation of condensed chromatin structures as cells divide (c) inheritance of DNA methylation patterns when cells divide (d) proper segregation of housekeeping proteins when cells divide