The origin of the mitochondrion and chloroplast by endosymbiosis, hypothesizes that these organelles originated by
A. the fusion of two archean cells to form an early eukaryote.
B. the absorption of RNA from prokaryotic cells.
C. prokaryotic cells that became internal symbionts within an early eukaryotic cell.
D. the uptake of free DNA from the environment.
E. prokaryotic cells being engulfed and becoming external symbionts within an early bacteria cell.
C. prokaryotic cells that became internal symbionts within an early eukaryotic cell.
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During translation, tRNAs bind to mRNA through ____
a. ionic bonds b. van der Waals forces c. nonpolar covalent bonds d. hydrogen bonds e. polar covalent bonds
The most plentiful sugar in nature is
a. glucose. b. sucrose. c. fructose. d. maltose. e. lactose.
Which of the following best describes IgM antibodies?
A) They cause basophils and eosinophils to degranulate. B) They are the most common type of antibody in the blood during the initial stages of an immune response. C) They are the antibody class found in body secretions. D) They interact with phagocytes and NK cells. E) They can cross the placenta to provide passive immunity.
During S phase, chromosomes are converted to what form?
A) chromatin B) karyotypes C) centrosomes D) sister chromatids