All protists _____
A) contain a nucleus
B) are smaller than animal cells
C) are unicellular
D) have a cell wall
E) are photosynthetic
Answer: A
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Several of the different globin genes are expressed in humans, but at different times in development. What mechanism could allow for this?
A) exon shuffling B) intron activation C) pseudogene activation D) differential translation of mRNAs E) differential gene regulation over time
A key innovation that helped sporophyte dominant plants survive in high, dry environments is ____
a. flagellated sperm b. the cuticle c. xylem d. phloem e. lignin
A nucleosome consists of DNA wrapped around scaffolding proteins
__________________ Indicate whether the statement is true or false.
The earliest cells on Earth were primitive anaerobic bacteria. Why were they anaerobic?
a. Oxygen gas was present in the atmosphere. b. They had no photosynthetic pigments. c. There was no oxygen gas in the early Earth's atmosphere. d. Bacteria did not possess the complicated mechanisms required for other means of energy generation. e. They required the heat produced by Earth's molten rock.