Nuclear pores permit the passage of all the following except:
A. RNA only outward.
B. proteins inward and outward.
C. DNA molecules only outward.
C
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A 59-year-old patient with cancer who was receiving high doses of chemotherapy developed a secondary lung infection that was identified as a fungus. The organism disseminated, which ul-timately was fatal to the patient. The organism isolated from sputum exhibited septate hyphae that were dichotomous. The organism is most likely which of the following?
a. Candida b. Cryptococcus c. Aspergillus d. Zygomycetes
Steroid hormones include____
a. thyroid hormones b. oxytocin c. insulin and glucagon d. estrogen and testosterone e. epinephrine and norepinephrine
10,000 kcal of producer could support approximately how many kcal of tertiary consumer?
a. 1,000 b. 100 c. 10 d. 1 e. 0
What types of molecules may NOT need transport proteins to be able to cross cytoplasmic membranes?
A) large molecules B) ions C) small hydrophobic molecules D) small hydrophilic molecules E) nothing crosses cytoplasmic membranes without transport proteins