Drugs that block angiotensin-converting enzyme would cause which of the following?
A) decreased heart rate
B) activation of the parasympathetic nervous system
C) decreased mean arterial pressure
D) stimulation of reactive hyperemia
E) decrease in epinephrine release
Answer: C) decreased mean arterial pressure
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When scientists were attempting to determine the structure of the genetic code, Crick and coworkers found that when three base additions or three base deletions occurred in a single gene, the wild-type phenotype was sometimes restored
These data supported the hypothesis that ________. A) the code is triplet B) AUG is the initiating triplet C) the code contains internal punctuation D) there are three amino acids per base E) the code is overlapping
Newly synthesized membrane lipids are found in both halves of membrane bilayers because they are
a. synthesized on both surfaces. b. removed and transported to these locations by lipid transport proteins. c. synthesized on one surface and flip spontaneously to the other surface. d. synthesized on one surface and flipped to the other surface by proteins called flippases.
Answer the following questions true (T) or false (F)
1. Canned foods are prepared using the same temperature as is used for autoclaving. 2. Through recombinant DNA technology, many plants now can manufacture their own Bt toxin, which improves fermentation. 3. Reducing the water content of food is a highly effective way of reducing food spoilage.
Based on hierarchical classifications and features, which statement about humans is true?
a. Humans are deuterostomes. b. Humans are acoelomates. c. Humans are diploblasts. d. Humans are asymmetrical.