Which organelle can be likened to a post office?
A. Golgi apparatus
B. nucleus
C. mitochondria
D. endoplasmic reticulum
E. nucleolus
Answer: A
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Which of these stages were a focus of study for Miller and Urey in their FIRST experiment?
Study of the origin of life has resulted in the breakdown of cellular development into overlapping stages, beginning with the synthesis of precursor molecules for the synthesis of nucleotides and amino acids and ending in polymers enclosed in membranes acquiring cellular properties. A. Stage 1: Nucleotides and amino acids were produced prior to the existence of cells. B. Stage 2: Nucleotides became polymerized to form RNA and/or DNA, and amino acids became polymerized to form proteins. C. Stage 3: Polymers became enclosed in membranes. D. Stage 4: Polymers enclosed in membranes acquired cellular properties. E. Stage 5: Ribosomes were developed inside the membrane.
Only ________ available in a particular trophic level is passed to the next trophic level
a. 10% of the energy b. kinetic energy c. 30% of the energy d. potential energy
A litter produced by a calico cat is not expected to include
A) solid-colored female kittens. B) calico female kittens. C) solid-colored male kittens. D) calico male kittens. E) Any of these
The ________ help(s) plants retain water
A) hypha B) cuticle C) mycorrhiza D) lignin