What carries instructions for making proteins from the nucleus into the cytoplasm?
a. ATP
b. ribosomes
c. DNA
d. Rough ER
e. mRNA
Ans: e. mRNA
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Scientists using RNA in situ hybridization techniques observed that a transcription factor called macho-1 localized to some cells during early cleavage, but not others. Descendents of the cells expressing macho-1 produced mesoderm
If you prevented the expression of macho-1 in an embryo during cleavage, which structures would be most likely be absent in later development? A) neural tube B) somites C) digestive system D) skin
How does a heterotrophic animal obtain energy?
a. by ingesting living or dead organic matter b. by digesting food externally c. by making its own nutrients d. by engaging in photosynthesis
In which ponds did male guppies have the lowest mean number of spots?
a. ponds with no predators b. ponds with cichlids only c. ponds with killifish only d. ponds with cichlids and killifish
Paleontologists are scientists who study the fossil record. They can use the fossil record to identify a common ancestor. What is a common ancestor?
A) species that became extinct as the environment changed B) species that left a complete history of its existence in the fossil record C) species from which two or more species evolved D) species that suddenly appears in the fossil record and then just as quickly disappears