An enzyme without the cofactors is known as:
A. enzyme
B. holoenzyme
C. apoenzyme
D. cofactor.
Answer: Apoenzyme
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Which of the following statements about "excitable membranes" is correct? (Select all correct choices.)
A. Cells spend a significant amount of energy to pump Na+ out of muscle cells at rest. B. The difference in charge across a plasma membrane is called a membrane potential. C. Acetylcholine released from a nerve cell binds to a ligand-gated ion channel at the plasma membrane of a muscle cell. D. An excitable membrane at rest has a high concentration of Cl- ions outside the cell, which flood into the cell upon the opening of an ion channel.
A researcher decides to test the scientific validity of the common phrase “An apple a day keeps the doctor away.” What would be a valid hypothesis to investigate this specific question?
A. Eating apples decreases the frequency of contracting a cold. B. The daily consumption of a single apple does not change the number of visits to the doctor. C. Eating one apple every day is good for you. D. Apples are high in vitamin C. E. Those who consume apples have longer lifespans than those who do not consume apples.
Bacterial porins transport
A) any hydrophilic molecule regardless of size. B) hydrophilic molecules smaller than 600 Da. C) any hydrophobic molecule regardless of size. D) hydrophobic molecules larger than 600 Da. E) any molecule regardless of properties or size.
In the case of human height genes, a gene on chromosome 15 codes for an enzyme that converts testosterone to estrogen. This enzyme influences human height because:
A. testosterone helps bones to fuse at their ends and thus stop growing. B. estrogen brings on menstruation and thus an end to growth in height. C. estrogen helps bones to fuse at their ends and thus stop growing. D. testosterone prevents bones from fusing and thus continues growth in height.