In most ecosystems, the primary producers use energy from _____ to build organic compounds
a. inorganic chemicals c. heat
b. sunlight d. lower trophic levels
B
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Why is it necessary to take special safety precautions when using radioactivity?
A. Radioactive substances will ionize cells. B. Radioactive substances have the potential to cause damage to living cells. C. Radioactive substances decay. D. Radioactive substances will perforate plasma membranes.
Which of the following is an embryonic tissue
that is most recently evolved?
a. mesoderm b. ectoderm c. endoderm d. periderm e. epiderm
Scientists on a marine expedition collecting metagenomic data discover a novel genome that contains sequences for intracellular trafficking proteins similar to those found associated with the endoplasmic reticulum and Golgi apparatus. They initially hypothesize it is eukaryotic in nature, but discover additional sequences that are distinctly archaeal. The most appropriate classification is ________.
A. the proposed superphylum Asgard B. the TACK superphylum C. the DPANN superphylum D. Euryarchaeota
In which cellular organelle do the three posttranscriptional modifications often seen in the maturation of mRNA in eukaryotes occur?
A) lysosome B) Golgi C) cytoplasm D) nucleus E) mitochondrion