The sum of all chemical reactions in a cell is referred to as ____
Fill in the blank with the appropriate word.
Answer Key: metabolism
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The half-life of carbon-14 is approximately 5,700 years. How much of an initial 1.0 gram sample of carbon-14 will remain after 11,400 years (two half-lives)?
a. 0.33 grams (33%) b. 0.5 grams (50%) c. 0.25 grams (25%) d. 0.12.5 grams (12.5%)
Which of the following is a correct sequence of cells in oogenesis?
a. oogonium ? primary oocyte ? secondary oocyte b. oogonium ? secondary oocyte ? primary oocyte c. primary oocyte ? secondary oocyte ? oogonium d. primary oocyte ? oogonium ? secondary oocyte e. secondary oocyte ? primary oocyte??oogonium
Congenital deafness in humans is due to the homozygous condition of either of the recessive genes d
or e, or both of these genes. Both dominant D and E are necessary for normal hearing. Gene D/d affects the middle ear, while gene E/e affects the inner ear. It does not matter how good the normal inner ear (as indicated by E__) is; if there is something wrong in the middle ear, the individual is unable to hear. The same applies for the other gene. Give the phenotypic results of the following crosses: (a) Dd EE ? Dd EE (b) Dd Ee ? Dd Ee (c) dd EE ? DD ee (d) Dd EE ? Dd ee (e) Dd EE ? DD Ee What will be an ideal response?
Which organelles store starch in plants?
a. amyloplasts b. chromoplasts c. vacuoles d. chloroplasts