Tunde has started to forget where she puts things and often forgets the names of people she has just met. What part of her brain is most likely not performing properly, according to the information in the text?
A) prefrontal cortex B) cerebellum C) hippocampus D) cerebrum
Answer: C
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Within a cell, the amount of protein made using a given mRNA molecule depends partly on _____
A) the degree of DNA methylation B) the rate at which the mRNA is degraded C) the presence of certain transcription factors D) the number of introns present in the mRNA E) the types of ribosomes present in the cytoplasm
Calcium is required for bacteria because it
A. stabilizes the cell wall. B. maintains cellular pH. C. stabilizes the nucleoid. D. stabilizes the ribosomes. E. makes strong cell walls.
In general, DNA viruses that affect humans:
a. Use the host cell's machinery to replicate b. Use the host's enzymes to replicate c. Replicate in the nucleus d. All of the answers are correct e. Are double-stranded
Plasma membranes are selectively permeable. This means that
A) anything can pass into or out of a cell as long as the membrane is intact and the cell is healthy. B) the plasma membrane allows some substances to enter or leave a cell more easily than others. C) glucose cannot enter the cell. D) plasma membranes must be very thick.