The mutation that causes SCD causes what kind of change in the structure of hemoglobin?
A) decreases heme-binding ability
B) fewer chains of amino acids (trimeric rather than tetrameric structure)
C) a single amino acid substitution that alters the structure of the tetramer
D) addition of a single amino acid that causes a longer protein subunit
E) loss of a single amino acid that causes a frameshift and premature stop codon
C
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According to the Oparin-Haldane hypothesis, ____ was likely absent or near absent in Earth's early atmosphere
a. O2 (oxygen) b. H2 (hydrogen) c. CH4 (methane) d. H2O (in vapor form) e. NH3 (ammonia)
What type of microscope uses electrons to illuminate the sample? a. Fluorescence microscope b. All of them use electrons
c. Phase-contrast d. Electron microscope e. Light microscope
In this type of competitive interaction, the competing species reduce the amount of resources available to each other without direct interaction with each other.
Fill in the blank(s) with the appropriate word(s).
What types of molecules may NOT need transport proteins to be able to cross cytoplasmic membranes?
A) large molecules B) ions C) small hydrophobic molecules D) small hydrophilic molecules E) nothing crosses cytoplasmic membranes without transport proteins