Which feature do scientists mainly consider when grouping organisms according to evolutionary classification?
a) population size
b) common ancestry
c) identical niche
d) similar bone structure
Ans: b) common ancestry
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Which of the following organelles has only a single membrane around it?
A) ribosome B) nucleus C) mitochondrion D) chloroplast E) peroxisome
The large size of poxviruses allows them to
A) be easily isolated in infected cells. B) attach to both animal and human cells. C) provoke a strong immune response in the host. D) travel in droplets. E) be potential vectors for genetic engineering of vaccines.
During this phase of the cell cycle the nuclear membrane reforms around the chromosomes:
A. Metaphase B. Prometaphase C. Telophase D. Anaphase E. Prophase
A first exposure to an allergen stimulates the immune system to make ________
a. IgM b. IgD c. IgA d. IgE