How long does it take to form 1 inch of soil?
A. 1 year
B. 10 years
C. 50 years
D. 100 years
E. Hundreds or thousands of years
Ans: E. Hundreds or thousands of years
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A mutation from the most prevalent form of a gene to a mutant form is called a ________ mutation.
A. reverse B. forward C. escalating D. wild card
Select the best choice below to match statements 135–137
a. surgical correction b. chemotherapy c. genetic screening d. genetic counseling e. gene therapy M 135. Identification of persons with sickle-cell anemia can be done by this method. M 136. Once the risks have been determined, this method is an effective way of dealing with a genetic disorder prior to its occurrence in a child. M 137. The substitution of a normal allele for a defective allele via the methods of genetic engineering would be an example of this.
The accompanying figure represents Lack's hypothesis on clutch size. According to this hypothetical data, ________
A) the probability of survival for individual nestlings decreases linearly with each successive increase in the clutch size B) the probability of survival for individual nestlings increases, then decreases with each successive increase in the clutch size C) the optimal clutch size in terms of survival rates is intermediate D) A and C are both true. E) All of the above are true.
In a completed Gram stain, gram-positive bacteria are purple
Indicate whether the statement is true or false