Following the attachment and invasion of a microorganism, in order to be classified as a disease the microorganism must be capable of:
a. causing inflammation and tissue destruc-tion.
b. creating pain and requiring antibiotic treatment.
c. multiplication and dissemination to deeper tissues.
d. killing the resident microbiota.
C
An infection or multiplication of an organism may be localized to a small area causing discomfort and inflammation. The formation of a disease indicates that not only has the organism caused an infection but is also capable of multiplication and growth and disseminating to deeper tissues causing an extensive damage to the host.
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The width of a DNA double helix ____
a. is constant b. is narrower where adenine is present than where cytosine is present c. is wider where purines are present than where pyrimidines are present d. varies randomly e. is wider where pyrimidines are present than where purines are present
What does the data analysis allow you to conclude about linkage between sn and car? (Select all that apply.)
In Drosophila, singed bristles (sn) and carnation eyes (car) are both caused by recessive X-linked alleles. The wild-type alleles (sn+ and car+) are responsible for straight bristles and red eyes, respectively. A sn car female is mated to a sn+car+ male and the F1 progeny are interbred. The F2 are distributed as follows:
A) There is a high probability that the deviations from the expected number of F2 in each genotype class are due to chance.
B) The data do not allow rejection of the null hypothesis.
C) The p value is high meaning that the data is significant.
D) There is good evidence that cn and car are linked.
Mendel crossed pea plants dominant for two different traits (tall and green pods) with pea plants recessive for those same two traits (short and yellow pods). This cross resulted in pea plants that had combinations of all four traits (tall with green pods, tall with yellow pods, short with green pods, and short with yellow pods). Which law of inheritance best describes why this happens?
A. the law of segregation B. the second law of thermodynamics C. the law of independent assortment D. the law of pedigrees
How would a calcium deficiency affect the process of skeletal muscle contraction?
A) Skeletal muscles would not be able to utilize ATP as a source of fuel. B) The action potential would be blocked from entering the muscle fiber. C) The myosin heads would remain attached to actin molecules. D) Myosin heads would not bind to actin efficiently.