Which of the following is the best answer for why plants require nitrogen?
A. to make membranes
B. to make cell walls
C. to make chlorophyll
D. to make amino acids and nucleotides
Answer: D
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Sperm cells mature and are stored within human males in the _____
A) urethra B) prostate C) epididymis D) seminal vesicles E) bulbourethral gland
Repressor Ex. 1: Tetracycline Resistance
What will be an ideal response?
Which of the following nutrients is digested only after it reaches the small intestine?
A) fat B) protein C) starch D) polypeptide
Answer the following questions true (T) or false (F)
1. Microscopic algae and bacteria produce over half of the oxygen in the atmosphere. 2. The core of some viruses is carbohydrate in nature. 3. Scientists do not consider viruses to be alive because viruses cannot metabolize outside a host cell.