Suppose that an equal amount of each of the following polysaccharides was placed in a landfill. Which
of them should last the longest before it is decomposed?
a. chitin
b. amylopectin
c. cellulose
d. glycogen
e. amylose
C
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Double-stranded DNA absorbs less UV light than single-stranded DNAbecause:
A. base stacking in double-stranded DNA increases the absorbance of white light and causes a decrease in the amount of UV light it can absorb. This decrease in UV absorbance is called the hyperchromic effect. B. the bases are on the inside of the helix, inaccessible to the UV light in double-stranded DNA. C. in single-stranded DNA the bases are not interacting so more photons can be absorbed by the pentose rings. D. single-stranded DNA actually absorbs more of the UV light, making less light available to double-stranded DNA. E. of the hypochromic effect that results when hydrogen bonding and base stacking in double-stranded DNA limits resonance in the aromatic rings of the bases.
Which of the following is not an assumption of the Hardy-Weinberg principle?
a. no mutation b. no migration c. small population size d. random mating e. no selection
HeLa’s cells were critical in
a. the development of polio vaccines. b. developing a cure for malaria. c. understanding fertilization. d. the development of a cervical vaccine. e. more than one of these
Dr. Foster is studying the effectiveness of a new memory-boosting diet supplement. He posts an ad for subjects at two local colleges. He assigns 55 students from college A to the treatment group (daily doses of the diet supplement) and 60 students from college B (no supplement) to the control group. After 6 months of the study, Dr. Foster gives all of the students in each group a memory test. The treatment group scores an average of 20 points higher than the control group (a significant difference). Based on these findings, Dr. Foster declares that the memory-boosting supplement helps increase a person's memory. What would improve the design of the Dr. Foster's study?
A) Make the number of students in both groups the same. B) Randomly assign students to one of the two conditions (treatment or control). C) Administer the supplement for a longer period of time. D) Give the control group half the daily dosage of the diet supplement that the treatment group receives. E) Deprive the control group of sleep to see if that also affects memory recall.