A person using a very effective sunscreen would be less likely to make which vitamin within his or her body?
A) vitamin A
B) vitamin B
C) vitamin C
D) vitamin D
D
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If a cell begins to divide in an uncontrolled way, it ____
a. will always form a cancerous tumor b. may form a benign tumor c. is a sign of metastasis d. is considered a malignant tumor e. signals uncontrolled cell division in other parts of the body
Both starch and cellulose are made by stringing together many glucose molecules. However, while starch is easily digested by humans, cellulose is indigestible. The starch polysaccharide has bonds occurring below the sugar rings, while the bonds in cellulose alternate above the ring and below the next ring. How can you explain humans' inability to digest cellulose?
A. The alternating bonds make the cellulose molecule too large and bulky to enter cells for digestion. B. The acidic molecules found in stomach acid cannot act on the bonds that are above the sugar rings in cellulose. C. Humans do not eat cellulose. D. Cellular respiration is only capable of breaking down specific bonds. E. The enzyme that breaks down starch can only fit the specific bond configuration of bonds below the ring.
Genomic pattern recognition begins with identification of ____ , which are telltale sequences that identify what type of sequence it is
Fill in the blank with the appropriate word.
Relative to ectotherms like fish, endotherms like mammals have ______.
a. higher rates of Na+ and K+ leak across their cellular membranes b. higher concentrations and activities of the Na+/K+ ATPases in their cellular membranes. c. lower rates of oxygen consumption per gram d. a and b are correct e. a, b and c are correct