When a gene from one species is transferred into another species, the result is ____
a. a GMO
b. a new species
c. a hybrid animal
d. eugenics
e. a lethal mutation
ANSWER: a
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In a eukaryotic genome, DNA replication starts at
A) a single origin of replication. B) one replication fork per chromosome. C) nucleosomes. D) multiple sites along the length of each chromosome.
Guard cells
a. surround the stoma. b. control the opening to the interior of the leaf. c. become swollen when it becomes light, if environmental conditions are not too hot or dry. d. absorb water from surrounding epidermal cells. e. do all of these
Which event does not take place before the start of mitosis?
A. The nuclear envelope disintegrates. B. Organelles proliferate. C. DNA is replicated. D. The parent cell grows.
Archaea often live in nutrient-poor environments. In order to ensure survival, they must ________.
A. accumulate nutrients inside the cell at higher concentrations than the external environment, which requires active transport mechanisms B. develop metabolic pathways to synthesize their own nutrients using cytoplasmic molecules C. acquire nutrients inside the cell at lower concentrations than the external environment, which requires passive transport mechanisms D. transport nutrients to the outside of the cell by facilitated diffusion