Q: Answer the following question given this paragraph: A stroke occurs when a blood clot blocks blood flow to part of the brain. Brain cells die quickly when their oxygen supply is cut off. Therefore, a stroke may cause permanent loss of normal mental functions. Many stroke patients suffer some degree of paralysis, or loss of the ability to feel or move certain parts of the body. If medical treatment is given very soon after a stroke occurs, some of the damage may be reversed. Strokes occur mainly in older adults. Q: What medical emergency occurs when a blood clot blocks blood flow to part of the brain, causing death of brain cells? A:

OPTIONS:
- cardiac arrest
- epileptic seizure
- heart murmur
- stroke

A: stroke

Q: Answer the following question given this paragraph: Hemoglobin Hemoglobin is a large molecule made up of proteins and iron. It consists of four folded chains of a protein called globin, designated alpha 1 and 2, and beta 1 and 2 (Figure 18.7a). Each of these globin molecules is bound to a red pigment molecule called heme, which contains an ion of iron (Fe2+) (Figure 18.7b). Q: Hemoglobin is a large molecule made up of proteins and iron. it consists of four folded chains of a protein called this? A:

OPTIONS:
- peptide
- histone
- insulin
- globin

A: globin

Q: Answer the following question given this paragraph: The sugar of one nucleotide binds to the phosphate group of the next nucleotide. Alternating sugars and phosphate groups form the backbone of a nucleotide chain, as shown in Figure below . The bases, which are bound to the sugars, protrude from the backbone of the chain. In DNA, pairs of bases-one from each of two nucleotides-form the middle section of the molecule. Q: The sugar of one nucleotide binds to what group of the next nucleotide? A:

OPTIONS:
- the alkaline
- the chloride
- the protein
- the phosphate

A: the phosphate

Q: Answer the following question given this paragraph: Compounds like sodium chloride form structures called crystals. A crystal is a rigid framework of many ions locked together in a repeating pattern. Ions are electrically charged forms of atoms. You can see a crystal of sodium chloride in the Figure below . It is made up of many sodium and chloride ions. Q: Compounds like sodium chloride form structures called what? A:

OPTIONS:
- ions
- microorganisms
- hydrocarbons
- crystals

A:
crystals