In his monohybrid crosses, Mendel deduced that one trait was recessive because _____
A. that trait was not present in the F1 and did not reappear in the F2
B. that trait was present in the F1 and in the F2
C. that trait was not present in the F1 and reappeared in the F2
D. that trait was present only in the parents
E. that trait was present only in the F2
C
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Two principal organelles in eukaryotes that were apparently derived from different types of bacteria are the
A. microfilaments and microtubules. B. mitochondria and chloroplasts. C. rough ER and smooth ER. D. plasma membrane and nuclear membrane.
Performing gene therapy on somatic cells removed from the body and then returning these cells to the body is called ________ gene therapy.
A) in vivo B) in situ C) in vitro D) ex vivo
What structures are found between the
vertebrae?
a. cartilage b. tendons c. fibrous connective tissue d. ligaments e. bone marrow
Osteoporosis sometimes results from ____
a. excessive PTH secretion b. insufficient PTH secretion c. excessive intake of vitamin D d. excessive intake of iodine e. insufficient intake of vitamin D