Besides growth, what must happen before a cell divides?
a. The cytoplasm divides into four parts.
b. Gene mutation.
c. Cancer.
d. DNA replication
Answer: d. DNA replication
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What new technology increases the precision of gene editing, and may make gene therapy easier?
A. next-generation sequencing B. CRISPR-Cas9 C. microarrays D. FISH E. PCR
Active transport
a. helps establish the resting potential of a neuron. b. counters the process of diffusion. c. allows transport of ions across the plasma membrane of the neuron against the concentration gradient. d. helps establish the resting potential of a neuron and counters the process of diffusion. e. does all of these.
What is the function of tRNA molecules during translation?
A) They unzip double-stranded mRNA. B) They serve as the starting point for RNA polymerase. C) They carry amino acids to the ribosome. D) They encode the instructions for protein synthesis.
Lichens
A. cannot reproduce B. need a nitrogen source to live C. are parasitic on trees D. are able to live in extreme environments