Atmospheric CO2 was stable until
a. 10,000 years ago.
b. World War I.
c. World War II.
d. the Industrial Revolution.
e. 15 million years ago.
Answer: d
You might also like to view...
Circular DNA molecules found in nature (such as bacterial, viral, or mitochondrial DNA) are
A) positively supercoiled. B) negatively supercoiled. C) not supercoiled, due to their small size. D) always oriented in a triple helix to conserve space. E) always in the relaxed state.
Grain size in the intertidal is primarily determined by:
a. wave activity. b. types of animals in the area. c. amount of sunlight. d. feeding types in the sediment. e. burrowing activity of infauna.
Tumor suppressor genes are distinguished from proto-oncogenes due to the fact that tumor suppressor genes normally _____ while proto-oncogenes _____
1.act at either the G1/S or the G2/M control point to inhibit cell division / encode proteins that stimulate cell growth and division 2.turn on or increase the rate of cell division / mutate to form oncogenes 3.act at either the G1/S or the G2/M control point to inhibit cell division / are switched off when mutated 4.none of the choices
Which cancer may be suspected when a woman has vaginal bleeding during times in the menstrual cycle other than her period, or after menopause?
A. Ovarian B. Endometrial C. Cervical D. Rectal