Glycogen is a polysaccharide used for energy
storage by
a. plants.
b. animals.
c. protists.
d. bacteria.
e. archaea
B
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In the familial form of retinoblastoma, individuals who inherit one mutant allele of the RB1 gene have an 85% chance of developing retinoblastoma and other cancers. Explain why, when these individuals carry only one copy of the mutant gene, there is such a high incidence of cancer in these RB1 heterozygotes
What will be an ideal response?
DNA and RNA are similar in that both
a. contain the same sugar. b. are double-stranded molecules. c. contain nitrogenous bases. d. are in the form of a double-helix. e. are very long molecules.
In which of the following diseases does a virus
infect and kill motor neurons?
a. polio b. amyotrophic lateral sclerosis c. Duchenne muscular dystrophy d. multiple sclerosis e. fibromyalgia
Which of the following is true of the adrenal medulla?
1.It controls sodium and water reabsorption in kidneys. 2.It releases norepinephrine into the blood. 3.It secretes sex hormones. 4.It decreases cortisol level in the blood.