An organelle found in the nucleus is known as a ____
a. nucleolus
b. plastid
c. vacuole
d. microvillus
e. basal body
ANSWER: a
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All of the following are true of the SA node EXCEPT that it
A) is the pacemaker. B) is influenced by nerve impulses and hormones. C) directly stimulates the ventricles. D) directly stimulates the atria.
Which statement is false with regard to mutations?
A. They are always dangerous. B. They can occur as DNA replication errors. C. They cannot be repaired after replication. D. They may become cancerous. E. They can be passed on to the next generation.
Fossil and genetic evidence strongly supports the idea that modern humans
A) independently arose from three different ancestral Homo species in Africa and Eurasia. B) all derive from a single African lineage that spread from there into other parts of the world starting about 50,000 years ago. C) derive from an African lineage but also have genes derived from mixing with several Eurasian descendants of Homo erectus. D) derive from Neanderthals that independently evolved the features of modern humans in Europe and Africa.
Most somatic cells (regular cells) in your body replicates through a cell division process called __________.
A. sex differentiation B. mitosis C. dimorphic cell division D. meiosis