Which is the correct sequence of embryonic development in eudicots?
a. globular stage embryo ? suspensor embryo ? proembryo ? heart stage embryo
b. heart stage embryo ? globular stage embryo ? proembryo ? torpedo stage embryo
c. torpedo stage embryo ? globular stage embryo ? heart stage embryo ? suspensor
d. proembryo ? torpedo stage embryo ? heart stage embryo ? globular stage embryo
e. proembryo ? globular stage embryo ? heart stage embryo ? torpedo stage embry
e
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Which theory of virus evolution hypothesizes that viruses evolved from genetic elements such as transposons?
a. progressive hypothesis b. regressive hypothesis c. self-replicating hypothesis d. endosymbiont hypothesis
When lifting a heavy object, the strength of leg muscle contractions is determined by the
A) amount of ATP used by each active sarcomere during muscle contraction. B) number of calcium ions released by the sarcoplasmic reticulum. C) frequency of action potentials and number of muscle fibers stimulated. D) number of thick and thin filaments involved in each sarcomere during contraction.
According to the animation, what does the electron transport chain do to the concentration of hydrogen ions (protons)?
a. The concentration of protons inside the membrane is equal to the concentration outside of the membrane. b. The concentration of protons is higher outside the membrane than inside. c. The concentration of protons is lower outside the membrane than inside.
Genetic drift arises from all the following EXCEPT ________
A) a small breeding population B) a founder effect C) a genetic bottleneck D) mutations