Which term refers to a nutrient that is required by a microorganism in large quantities for use in cell structure and metabolism?
A. element
B. growth factor
C. trace element
D. macronutrient
Answer: D
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Which early scientist proposed that cells arise only from preexisting cells by a process of division?
a. Anton van Leeuwenhoek b. Robert Brown c. Matthias Schleiden d. Theodor Schwann e. Rudolf Virchow
A key advantage of having a four-chambered heart is ____
a. only oxygen-rich blood flows to tissues b. blood pressure in the separate circuits is not independently controlled c. two separate circuits are possible d. lungs are only possible with a four-chambered heart e. blood oxygenates more quickly
The transfer of electrons from one compound to another is equivalent to __________ transfer
a. heat b. oxygen c. enzymatic d. phosphorus e. energy
DNA helicase and topoisomerase are similar insofar as they promote the unwinding and uncoiling of DNA.
Answer the following statement true (T) or false (F)