On the pH scale, any substance below what number is considered acid?
Answer(s): C
The pH scale ranges from 0 to 14, with 0 being acidic and 14 being alkaline (or basic). A pH of 7 is considered neutral. Anything below 7, then, is acidic.
Which of the following structures has DNA?
Answer(s): A
The Watson-Crick model of DNA is a double-stranded twisted ladder, or double helix.
Which of the following plants lacks a vascular system?
Liverworts are bryophytes, which are characterized by their lack of a vascular system.
Which of the following symbols represents one of the elements present in NaCl?
Answer(s): B
The elements that make up NaCl are sodium (Na) and chlorine (Cl).C is the symbol for carbon, which is not present at all.N is the symbol for nitrogen.NH is a compound including more than one element.
Heparin is an anticoagulant.What is the primary purpose of drugs like Heparin?
Answer(s): D
An anticoagulant is a substance that stops blood from clotting.
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