Not all proteins achieve quaternary structure. What determines quaternary structure in proteins?
a. Quaternary structure results from protein denaturation and renaturation with the unraveled protein returning to its original shape and function.
b. Quaternary structure results from modification once the protein is released from the cell and enters the extracellular space.
c. Quaternary structure results from several formed polypeptides that interact with one another to form a larger, functional unit.
d. Quaternary structure results from protein synthesis in the ribosome dictated by the detailed instructions of the mRNA.
c. Quaternary structure results from several formed polypeptides that interact with one another to form a larger, functional unit.
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Several chemical properties make water uniquely suited for its role as a central "molecule of life." Which of the following is FALSE?
A. Hydrogen bonding leads to high cohesiveness between water molecules. B. Water resists temperature changes. C. Water is always polar. D. The structure of a water molecule is stabilized by hydrogen bonds. E. Water is a good solvent of polar molecules and ions.
In a cell dividing by meiosis, DNA is replicated
A. during prophase II. B. during prophase I. C. before meiosis I. D. between meiosis I and again before meiosis II.
What is the best strategy for preserving biodiversity?
A) to depend on the Endangered Species Act to produce its intended consequences B) to prevent inbreeding in small populations C) to use genetic engineering to create new combinations of genes D) to prevent species from becoming endangered in the first place
To diagnose and treat a disease, a doctor must evaluate the patient's body at multiple levels of organization. Identify the level of organization relevant to each stage of the process described below.(1) As part of Fred's annual physical, the doctor examined his skin, fingernails and hair for signs of disease. Noticing an unusual lesion on his neck, the doctor referred Fred to a dermatologist.(2) Upon observing the lesion, the dermatologist said, "Yes, this looks like it could be a squamous cell carcinoma, a tumor in the epidermis of the skin."(3) The dermatologist carefully examined all of Fred's skin for signs of additional tumors, but did not find any.(4) The dermatologist removed the lesion and sent it for a biopsy. Under the microscope, the pathologist saw some cells with abnormal
morphology and confirmed a diagnosis of squamous cell carcinoma. However, he noted that the margins of the lesion were clear of abnormal cells, and the tumor had been successfully removed. A. organism, cell, tissue, organ B. organ system, tissue, organ, cell C. organism, cell, organ system, tissue D. organ system, organ, tissue, cell