Which of the following statements regarding the structure of blood vessels is incorrect?
A. In contrast to veins, arteries have higher blood pressure, more tissue layers, and are thinner vessels.
B. Blood vessels are often found in parallel with lymphatic vessels.
C. Capillaries have only a single layer of endothelium, rendering them fragile and leaky during an infection with a hemorrhagic fever virus.
D. Connective tissue and muscle fibers are found in the layers of tissue surrounding both arteries and veins.
Answer: A
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Which statement most closely expresses our present understanding?
A) The chloroplast is an ancestor of the cyanobacteria. B) The cyanobacteria are descendents of the chloroplast. C) The chloroplast arose from the incorporation of a cyanobacterial-like organism. D) The chloroplast and the cyanobacteria are not closely (or specifically) related.
Without changing the sequence or the orientation of the sequence(s), which is/are complementary to the sequence 5' AGGCUAAC 3'?
A. 5' TCCGATTG 3' B. 3' TCCGATTC 5' C. 5' CTTAGCCT 3' D. 3' TAAGCTTA 5' E. 3' TCCGATTC 5' AND 5' CTTAGCCT 3'
After DNA fragments with complementary sticky ends base pair, ____seals the gaps between the fragments to produce
a continuous DNA molecule.
a. plasmids b. E. coli c. EcoRI d. DNA ligase e. restriction enzymes
What can be said about peptide hormones?
A. They bind membrane receptors to elicit a response on target cells. B. They are water-soluble and bind membrane receptors to elicit a response on target cells. C. They are lipid-soluble. D. They are generally water-soluble. E. They bind intracellular receptors to elicit a response on target cells.