Epithelial cells form tightly cohering sheets whereas erythrocytes occur as single cells. What type of integral proteins would you expect to reside in the plasma membrane of an epithelial cell that might be absent from that of an erythrocyte?
A. receptor proteins
B. skeletal proteins such as microtubules and microfilaments
C. single pass integral membrane proteins
D. proteins involved in cell-cell adhesion or cell-cell communication
E. multiple pass integral membrane proteins.
Ans: D. proteins involved in cell-cell adhesion or cell-cell communication
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This diagram of the human life cycle shows that ________.
A. meiosis produces a diploid zygote B. fertilization produces a haploid zygote C. meiosis produces haploid sperm and egg cells D. a diploid zygote undergoes meiosis to produce an adult human
The sex ratio of human senior citizens (>65 years) is
A) skewed toward females. B) skewed toward males. C) 1:1. D) the same as birds'.
Which of the following is the primary fuel source for transportation?
a. nuclear energy b. renewable energy c. coal d. natural gas
e. petroleumWhich action is most similar to the way in which water is moved through the xylem sap of a plant?
A) a person drinking through a straw B) a vaccine being ejected out of a syringe C) water gushing up from a fountain D) a dart being blown out the end of a blowgun