Many studies of potentially useful new drugs involve the use of two groups of people: One group takes the drug and another group takes a placebo (like a sugar pill). Members of both groups do not know whether they are taking the drug or the placebo. What is the reason for designing these experiments this way?
What will be an ideal response?
The placebo group serves as a control group to account for any factor that might affect the condition of the patient other than the drug.
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Which of the following is not true about meristems?
A. They can be apical or lateral. B. Meristematic cells divide into two cells, one of which remains a meristem cell and another that becomes a plant body cell. C. Apical meristems give rise to three types of embryonic tissues. D. Meristematic cells are found only in eudicots and not in monocots. E. They are responsible for primary and secondary growth.
In eukaryotes the DNA molecule that makes up a chromosome is typically ____ and usually has ____
replication origin.
a. circular; one b. circular; more than one c. linear; more than one d. linear; one e. linear; no
The probability of a crossover occurring between two genes on the same chromosome _____
a. is unrelated to the distance between them b. decreases with the distance between them c. increases with the distance between them
The core promoter of active genes is found in a(n) ________________-free __________, which is a segment of DNA that is missing histones
Fill in the blank(s) with the appropriate word(s).