According to the theory of evolution, what characteristics do all living organisms share suggesting that all life-forms on Earth arose from a single ancestor?

A) They share a common organic chemistry.
B) They have DNA within their nucleus.
C) They exhibit the same basic cell wall.
D) They perform the same mode of reproduction.


A

Biology & Microbiology

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Which of the neuroimaging techniques requires a small amount of radioactivity to be injected into the bloodstream?

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Heavy sweating can induce heat cramps due to ______.

a. abnormal electrolyte levels in muscle cells b. abnormal electrolyte levels in neurons c. abnormal electrolyte levels in interstitial fluid d. All of the listed responses are correct.

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Single-copy replication control means that

a. only one DNA molecule can be present in a cell at a time. b. there can be only one origin of replication in the entire genome. c. only one DNA molecule can be replicated in a cell at a time. d. a DNA molecule can only be replicated once during the cell cycle. e. there can be only one origin of replication on each DNA molecule.

Biology & Microbiology