What is the current status of DNA vaccines?
A. None has been successfully created.
B. Several have been created but have been found to be ineffective.
C. Several have shown promise in animal studies and are now in clinical trials.
D. Several have passed clinical trials and are awaiting government approval.
E. They are in limited use against a small number of diseases.
C
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Freezing oocytes has not been as successful as freezing sperm because
A) they undergo an extra meiosis. B) the woman can become dangerously cold. C) ice crystals can form in the abundant, watery cytoplasm. D) the nuclei shatter.
What is the role of DNA in living things?
a. DNA stores the information required to make proteins. b. DNA produces food for cells. c. DNA produces energy for cells. d. DNA directs the production of proteins.
The central nervous system is most sensitive to
teratogens during weeks __________ of development. a. 3–16 b. 4–6 c. 4–8 d. 6–8 e. 7–18
Patients with type 1 diabetes mellitus:
A) need exogenous insulin to survive. B) are less likely to develop ketoacidosis. C) experience excessive cellular uptake of glucose. D) control their disease with dietary modification.