An athletic friend of yours recently had a blood test, asked for a copy of the report, and looked up numbers for his "total cholesterol," or combined LDL/HDL numbers. An online source lists his total as slightly high. He says, "My doctor's a quack! He
told me my cholesterol was fine!" You press your friend for more details and come to understand that his LDL levels are within the healthy range, but his HDL levels are higher than average. What do you say to your friend to help him understand his doctor's comments?
What will be an ideal response?
The doctor was right. Even if it makes "total cholesterol" seem higher than average, having higher HDL levels is good, because having high higher HDL levels helps to counteract the negative effects of LDLs.
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The vascular bundles in eudicot stems separate the ground tissue into two zones. Which sequence correctly describes the arrangement of those zones from the outside to the center?
a. epidermis ? vascular bundle ? pith ? cortex b. pith ? vascular bundle ? cortex ? epidermis c. epidermis ? cortex ? vascular bundle ? pith d. epidermis ? vascular bundle ? cortex ? pith e. cortex ? epidermis ? vascular bundle ? pith
According to the figure, the most effective wavelength for photosynthesis is revealed by algae exposed to ____
nanometers.
a. 680 b. 700 c. 400 d. 425 e. 550
Wetlands and floodplains control flooding by
A. temporarily storing water. B. diverting water to other drainage basins. C. evaporating most of the water. D. helping rain flow faster into rivers. E. Wetlands and floodplains control flooding by all of the above methods.
Complementary base pairs form _______ bonds to direct replication of DNA.
a. hydrogen b. phosphodiester c. glycosidic d. peptide