Oparin and Haldane's hypothesis states that the
A. Earth's early atmosphere contained 02.
B. first organic macromolecules originated in Earth's early atmosphere.
C. first cells were autotrophs.
D. first cells originated in the oceans.
D. first cells originated in the oceans.
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Seed plants are pollinated by:
A. butterflies B. birds C. bats D. beetles E. all of the other choices provided
Your house plant is growing slowly and lacks its normal bright green color, so you call a botanist for advice. She suggests that the plant may be deficient in magnesium (Mg2+). Why are these symptoms associated with Mg2+ deficiency?
A) Mg2+ is important in the structure of many amino acids. B) Lack of Mg2+ in the soil allows pathogenic bacteria to grow. C) Mg2+ is a cofactor for NADPH function. D) Mg2+ is an important component in chlorophyll. E) Cytochromes require Mg2+ to function properly.
How does aspirin help to stop pain?
What will be an ideal response?
Which of the following occurs when RNA polymerase attaches to the promoter DNA?
A) elongation of the growing RNA molecule B) termination of the RNA molecule C) initiation of a new RNA molecule D) initiation of a new polypeptide chain