Blood pressure is lowest when ventricles are _____; this is known as _____
a. fully relaxed; systolic pressure
b. contracting; diastolic pressure
c. contracting; systolic pressure
d. fully relaxed; diastolic pressure
e. in transition; systolic pressure
ANSWER: d
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Genetic divergences may ultimately lead to
a. new variations. b. new species. c. new gene frequencies. d. new competition. e. new alleles
A substance that gives up an electron to a free radical is a(n) ____
a. oxidizer b. antioxidant c. antibiotic d. antibody e. antiviral
When blood glucose levels rise, insulin signals cells to take up glucose, removing it from the blood. Diabetes mellitus is a disorder caused by a dysfunction in the insulin signaling system. There are two types of diabetes
People with type 1 diabetes must take insulin regularly, usually through injection. People with type 2 diabetes are not helped by supplemental insulin. What does this tell you about where the defect might be in these two disorders? A) Type 1 diabetes is probably caused by defective insulin receptors. B) Type 2 diabetes is probably caused by underproduction of insulin. C) Type 1 diabetes is probably caused by underproduction of insulin. D) Type 2 diabetes is probably caused by overproduction of insulin.
Preservation of traditional agroforestry systems offers which of these ecosystem services?
A. Regulation of climate B. Soil and water conservation C. Carbon sequestration D. Habitat for animals E. All of these