Dietary choices that can increase the risk of certain cancers include ________
A) diets high in saturated fats
B) diets high in antioxidants
C) high-fiber diets
D) diets low in cured foods
A
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Microorganisms use hydrogen bonds to attach themselves to the surfaces that they live upon. Many of them lose hold of the surface because of the weak nature of these bonds and end up dying or being washed away
Why don't microbes just use covalent bonds instead? A. Covalent bonds are always permanent bonds; the microbes could never get OFF their surface if they used them. B. Covalent bonds depend on completely giving up or completely accepting an electron to form the bond. This isn't possible for many microbes without dramatically altering their basic molecular composition. C. Covalent bonds typically require enzymes to form/break, whereas hydrogen bonds don't. If covalent bonds were used, it would require much more energy and molecules to be contributed from the cell. Hydrogen bonds don't have these requirements. D. Covalent bonds may have more specific and stringent requirements for what atoms can bond with. This makes for stronger bonds, but also decreases the overall potential for bonds that could readily be created between the microbe and its desired surface. E. C and D
The bones of synovial joints are held in place by ____
a. tendons b. loose connective tissue c. ligaments d. cartilage e. other bones
________ plants are adapted to grow in water or on soil that is periodically anaerobic because of excess water
Fill in the blank(s) with correct word
Which definition of evolution would have been most foreign to Charles Darwin during his lifetime?
A) change in gene frequency in gene pools B) descent with modification C) the gradual change of a population?s heritable traits over generations D) populations becoming better adapted to their environments over the course of generations E) the appearance of new varieties and new species with the passage of time