Blood collected from a victim at a crime scene contains 30% adenine. A short distance away, a knife is found with traces of blood containing 20% thymine. What conclusion can you make based on this evidence?
a. The blood on the knife belonged to the killer.
b. The blood on the knife belonged to the victim.
c. Further DNA sequencing is required.
d. The knife was not the murder weapon.
d. The knife was not the murder weapon.
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The Golgi complex functions to
A) modify and secrete proteins to the external environment. B) sort proteins used within the cell. C) both modify and sort proteins into those destined for secretion and those that function in membrane structures. D) synthesize proteins.
Formation of which one of the following large organic molecules from their respective building blocks does not result in the release of at least one water molecule?
A. proteins B. phospholipids C. polysaccharides D. nucleic acids E. proteins, phospholipids, polysaccharides and nucleic acids all release water as a result of their formation.
Which of the following is the fundamental mechanism that supports all forms of respiration?
a. osmosis b. kinetic energy c. diffusion d. momentum
Eukaryotic cilia and flagella:
A) may also act as receptors for hormones. B) are both involved in sweeping the lungs clean of foreign matter. C) occur in large numbers on the surface of the cell. D) are only found in single-celled organisms. E) both have microtubules forming their underlying structure.