What does the endosymbiont hypothesis propose?
a. It proposes that early eukaryotic cells acquired the precursors of mitochondria and chloroplasts by engulfing certain types of bacteria.
b. It proposes the use of solar energy for biosynthesis of cellular molecules and energy.
c. The hypothesis relates to the evolution of multicellular organisms about 1.2 million years ago.
d. It proposes that bacteria began to use oxygen in metabolism as oxygen became abundant in the atmosphere.
e. It suggests mechanisms that led to the evolution of prokaryotic cells
Ans: a. It proposes that early eukaryotic cells acquired the precursors of mitochondria and chloroplasts by engulfing certain types of bacteria.
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Southern blot is a method for ____
a. amplifying DNA segments using cycles of denaturation, annealing to primers, and DNA polymerase-directed DNA synthesis b. transferring DNA fragments from a gel to a membrane filter and used in hybridization experiments c. determining the nucleotide sequence of a DNA molecule d. producing several clones from a single cell by placing the cell in a Petri dish and allowing it to go through several divisions e. detecting mutant genes or differences in the pattern of gene expression
Behavioral responses that animals may or may not use are called facultative
Indicate whether the statement is true or false.
Polyploid plants are often unhealthy as compared to other plants
Indicate whether the statement is true or false.
During which stage of the cell cycle is cell growth and replication of organelles most significant?
A. M phase B. G1 phase C. G2 phase D. S phase E. G0 phase