What distribution pattern is the most common in the natural world?
a. random
b. uniform
c. clumped
d. stratified or layered
e. homogeneous
ANSWER: c
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In which of the following part or parts of the
life cycle are duplicated chromosomes NOT connected to each other?
a. G1 b. S c. G2 d. metaphase e. more than one of these
Comparing cells synthesizing secretory proteins and cells secreting steroid hormones, the cells synthesizing the steroid hormones have
A) more rough ER. B) more smooth ER. C) equal amounts of smooth and rough ER. D) equal amounts of smooth and rough ER, but more lysosomes. E) equal amounts of smooth and rough ER, but fewer lysosomes.
In the lab, you use a special balloon that is permeable to water but not sucrose to make an "artificial cell." The balloon is filled with a solution of 20% sucrose and 80% water and is immersed in a beaker containing a solution of 40% sucrose and 60%
water. The solution in the balloon is ________ relative to the solution in the beaker. A) isotonic B) hypotonic C) hypertonic
When is cell-to-cell communication particularly important in regulating gene expression?
A. During meiosis B. During mitosis C. During replication D. During embryonic development