Arsenic poisoning can lead to organ failure and death. Though arsenic can inhibit or interfere with a number of cellular enzymes, arsenic poisoning is thought to be mainly due to indirect inhibition of enzymes involved in both pyruvate oxidation and the Krebs cycle. As a result, this compound must be able to enter which cellular compartment?
A. the intermembrane space of the mitochondria
B. the nucleus
C. the endoplasmic reticulum
D. the cytoplasm
E. the mitochondrial matrix
Answer: E
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The region of the centromere contains repeated DNA sequences known as ________.
Fill in the blank(s) with the appropriate word(s).
Two species of Gelsemium spp., a flowering vine plant, share the same habitat and have similar insect pollinators. However, pollination occurs for Gelsemium semperviren from mid-January to late March, and for Gelsemium rankinii from late March to mid-April. This represents
A. gametic isolation. B. a process analogous to behavioral isolation in animals. C. temporal isolation. D. ecological isolation. E. mechanical isolation.
In addition to creating wealth and bringing in new material comforts, _____ brings risks of economic shocks and imposes burdens on human rights and the environment.
A) Marxism B) socialism C) managerialism D) capitalism
Nutrients reach cells in the epidermis by ________
A) moving out of blood vessels that originate in the hypodermis and extend into the epidermis B) moving out of blood vessels in the epidermis C) moving out of dermal blood vessels and diffusing through tissue fluid to the epidermis D) All of the above are true.