What is the whitish looking feature below the eye in the lantern-eye fish pictured here?
3
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Which cell cycle checkpoint controls whether a cell can enter mitosis?
a. G1 checkpoint b. M checkpoint c. G2 checkpoint d. S checkpoint
Atoms of isotopes
a. are electrically unbalanced. b. behave the same chemically and physically but differ biologically from other isotopes. c. are the same physically and biologically but differ from other isotopes chemically. d. have the same number of protons but a different number of neutrons. e. are produced when atoms lose electrons.
Motility is the only digestive task of the
a. mouth. b. esophagus. c. stomach. d. duodenum. e. jejunum.
Steroid hormones produce their effects in cells by _____
A) activating key enzymes in metabolic pathways B) activating translation of certain mRNAs C) promoting the degradation of specific mRNAs D) binding to intracellular receptors and promoting transcription of specific genes