The passageways in the nuclear envelope for movement of substances between the nucleus and cytoplasm are called nuclear ________.
A. pores
B. inclusions
C. endoplasmic reticulum
D. chromatin
E. histones
Answer: A
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conformation of the membrane of living systems. Fill in the blank(s) with the appropriate word(s).
For the average person in the U.S., the largest source of radiation exposure is
A. background radiation. B. medical X-rays. C. irradiated food. D. consumer products. E. remote-controlled devices.
Which of the following must exist in a population before natural selection can act upon that population?
A) genetic variation among individuals B) variation among individuals caused by environmental factors C) sexual reproduction D) the population has predators
If 20% of nucleotides in the DNA of a particular organism contain thymine, estimate the percentage of cytosine that is present in the DNA.
A. 80% B. 30% C. 20% D. 40% E. 15%