In a cell membrane, the phospholipid heads are ____
a. hydrophobic
b. nonpolar
c. dissolved in the cell’s watery interior
d. sandwiched between the phospholipid tails
e. formed by fatty acids
ANSWER: c
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You are testing a new chemotherapy drug that blocks a kinase in the cytoplasm that helps carry signals to the nucleus causing the cell to divide. If you expose cells to the drug at the same time you administer a hormone that should cause the cell to divide, which of the following steps would be blocked?
_____ Receptor activation _____ Signal transduction _____ Activation of transcription factors _____ Cell division
Human and chimpanzee genomes share 96% DNA sequence identity. What most likely causes humans to be
phenotypically distinct from chimpanzees?
a. the presence of many new genes unique to humans b. a much larger human genome compared to the chimpanzee genome c. the loss of higher functioning genes in chimpanzees d. dramatic changes in chromosome structure and organization in humans e. small mutations in protein coding sequences and changes in regulatory units of human genes
Discuss the three most important factors for successful reproduction. What will be an ideal response?
On occasion, chronic abusers of amphetamines have been misdiagnosed as suffering from:
A) panic disorder B) depression C) autism D) schizophrenia