In the late 1990s, what important discovery in genetics was made?
a. The three-dimensional structure of DNA was described, which showed how DNA might be replicated.
b. The first recombinant DNA experiments were performed that started the biotechnology field.
c. DNA sequencing methods were first discovered.
d. Genes were found to be located on chromosomes.
e. Tiny RNAs were discovered that play important roles in the regulation of gene expression.
Ans: e. Tiny RNAs were discovered that play important roles in the regulation of gene expression.
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This chordate has a four-chambered heart, no
bladder, the males typically have no penis, and no teeth. This animal is
a. a bird. b. a crocodile. c. a bat. d. a frog. e. a shark
__________ and/or __________ extend from many
prokaryotic cells and serve in attachment and motility. Fill in the blank(s) with the appropriate word(s).
In genetic goitrous cretinism, the phenotype is caused by accumulation of thyroid hormone and its breakdown products
a. True b. False
Tissue fluid forms because
A. of osmosis. B. fluid leaks from cells into the space surrounding cells. C. fluid is forced out between the cells of the capillary wall by the pressure in the capillary. D. blood in veins flows back into capillaries.