Exam 2 mar final wnswers

Exam 2 mar final wnswers - Exam 2 Biology 187 Spring 2008...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Exam 2 Biology 187 Spring 2008 1. It is NOT true that “a scientific hypothesis is an educated guess about the outcome of a scientific experiment.” Why is that definition wrong? a. Science involves more than experiments; collecting observational data is also important. b. Scientific hypotheses are more than just guesses; they are based on solid scientific theories. c. Making an educated guess about the outcome of an experiment is part of the process of testing a hypothesis but not the hypothesis itself. [From exam 1] d. Scientists simply do not guess but instead always require evidence before doing research. 2-5. (M) In a recent study, scientists discovered that the ends of the chromosomes (called telomeres) are longer in older people who exercise heavily each week than those of older couch potatoes. (N) Now it is possible that intense exercise is responsible for maintaining chromosomal telomeres. (O) Of course, it could be that what is going on is that older people with longer telomeres are genetically predisposed to age less rapidly, and they are therefore physically able to exercise more vigorously. (P) With these possibilities in mind, researchers studied older identical twins who exercised differently. (Q) They found that if one member of a pair of twins worked out much more than the other, the couch potato twin had shorter telomeres. 2. What is sentence (Q)? Choose among the list below. [d, from exam 1] a. Causal question, b. Hypothesis, c. Prediction, d. Test evidence, e. Conclusion 3. What is sentence (N)? Choose among the list above. [b, from exam 1] 4. What is sentence (O)? Also choose among the list above. [b, from exam 1] 5. What prediction is not explicitly stated but nonetheless was part of this study? a. The more an individual exercises, the shorter his or her telomeres should be. b. When identical twins differ in their exercise regime, the one that exercises more should have longer telomeres. [correct] c. Because identical twins are genetically the same, testing them should act as a control for genetic difference effects in this experiment. d. Because exercise reduces the loss of telomeres, twins should exercise the same amount if they wish to avoid the damage caused by ageing. 6. In a crime case in which DNA fingerprinting is involved, a criminologist might begin his work with this question: “Did John Smith really commit the rape-murder for which he was convicted?” This question is a descriptive hypothesis because it supplies a possible answer to the question a. Who committed this rape-murder? [correct] b. Why did John Smith commit this rape-murder? c. How was the rape victim murdered? 1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
d. Did John Smith have an accomplice when he committed this rape-murder? 7. Natural selection theory and tree of life theory
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 11

Exam 2 mar final wnswers - Exam 2 Biology 187 Spring 2008...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online