Suppose a biologist can separate one of a dozen pieces of chromatin from a eukaryotic (animal) nucleus. It might consist of which of the following?
A) one-twelfth of the genes of the organism
B) two chromosomes, each with six chromatids
C) a single circular piece of DNA
D) two long strands of DNA plus proteins
E) two chromatids attached together at a centromere
Ans: D) two long strands of DNA plus proteins
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Antibodies consist of four polypeptides, ________ heavy chains, and ________ light chains
A) one / three B) two / two C) three / one D) four / four
Suppose that the concentration of K+ inside the cell was 10, and the concentration of K+ outside of the cell was 100 mmol/l. Assuming 37C, the K+ equilibrium potential is ________.
a. -70 mV b. +61 mV c. -61 mV d. -90 mV
All DNA viruses of animals replicate in the nucleus of the host cell.
Answer the following statement true (T) or false (F)
Cattle egrets follow African ungulates such as African buffalo around and catch insects that the buffalo flush out. Oxpeckers perch on the backs of buffalo and feed on ectoparasites that infest the buffalo. Which one of the following shows the ecological interaction that the buffalo has with each bird?
A. Cattle egret: commensalism; oxpecker: commensalism B. Cattle egret: competition; oxpecker: mutualism C. Cattle egret: mutualism; oxpecker: commensalism D. Cattle egret: commensalism; oxpecker: mutualism E. Cattle egret: mutualism; oxpecker: mutualism