________ are the long thin cells of skeletal muscles.
a. Myofibrils
b. Bursa
c. Sarcomeres
d. Fibers
e. Tendons.
Ans: d. Fibers
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Why is ubiquitin nicknamed the "doom tag"?
a. When ubiquitin binds to a target protein, the ubiquitin enzyme degrades the protein. b. When ubiquitin binds to a target protein, the complex is sent to the proteasome and degraded. c. If a cell is deficient in ubiquitin, the cell will die. d. High levels of ubiquitin in a cell cause the cell to destroy vital proteins, leading to premature cell death. e. Ubiquitin binds to ribosomes and prevents them from translating proteins necessary for cell survival.
Which of the following organs of the endocrine system secretes melatonin?
a. pituitary gland b. pancreas c. pineal gland d. adrenal glands e. thyroid gland
A nucleosome consists of DNA wrapped around scaffolding proteins
__________________ Indicate whether the statement is true or false.
Which of the following is considered a model for enzyme action?
A. Lock and Key model B. Enzyme interaction model C. Transformation model D. Transcription model