According to the theory of endosymbiosis, ________ were once free-living prokaryotic organisms
a. mitochondria and chloroplasts
b. all of the choices
c. ribosomes
d. the nucleus and endomembrane system
a
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Chromosomes are condensed to their greatest extent during __________ of mitosis
a. metaphase b. prophase c. telophase d. interphase e. anaphase
An old DNA strand is used as a _____ for the assembly of a new DNA strand.
Fill in the blank(s) with the appropriate word(s).
An experimental group
A. is the same as the control group. B. differs from the control group by one variable. C. differs from the control group by several variables. D. is not necessary if an experiment contains a control group.
At which of the following levels does bicoid work in fruit flies?
A) regulation of development of organs only in the thorax region of the organism B) regulation of development of wings C) regulation of development of organ systems D) regulation of development of the head end, middle, and posterior end