In their 1953 paper on the double-helical structure of DNA, Watson and Crick famously wrote: "It has not escaped our notice that the specific pairing we have postulated immediately suggests a possible copying mechanism for the genetic material." What did they mean?
A. Sexually reproducing organisms swap their DNA.
B. The sugar-phosphate backbone of DNA holds the helix together in a way that allows the genetic information to be copied.
C. Each strand in a DNA double helix contains all the information needed to produce a complementary partner strand.
D. When a cell divides, each DNA helix is split between the daughter cells.
Ans: C. Each strand in a DNA double helix contains all the information needed to produce a complementary partner strand.
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When molecules diffuse, they move ________
a. down their own concentration gradient unless there are other molecules also diffusing in the vicinity b. up their own concentration gradient unless there are other molecules also diffusing in the vicinity c. up their own concentration gradient without regard to the gradients of other molecules d. down their own concentration gradient without regard to the gradients of other molecules
Which result might be a consequence of stabilizing selection?
A. There is an increase in antibiotic-resistant strains of bacteria. B. Infants born with weights between 3 and 4 kg have a higher survival than infants much lighter or heavier at birth. C. There is a decrease in the number of different breeds of dog.
This part of the rib articulates with the appropriate vertebra.
What will be an ideal response?
Changes heritable traits in a population through multiple generations is called
A. Hereditary B. Mitosis C. Genotype D. Phenotype E. Evolution