Sharks obtain neutral buoyancy by producing an oil called:
a. buoyancy.
b. squalene.
c. Omega-3.
d. fish oil.
e. ambergris.
B
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Figure 2 depicts the region of cells (shaded gray) in which the even-skipped protein is present in a developing Drosophila embryo. Which of the following statements about the control of the eve gene is likely true based on Figure 2?
A. The Hunchback protein is an eve repressor. B. The bicoid gene is an insulator for eve gene expression. C. The Krüppel protein is an eve repressor. D. The Giant protein is an eve activator.
In a salt-wedge estuary the relationship between salinity and depth is that salinity:
a. is even from top to bottom. b. increases with depth. c. changes abruptly with depth. d. varies horizontally. e. decreases with depth.
Which of the following do not undergo theta replication?
A) bacterial genomes B) mitochondrial genomes C) chloroplast genomes D) plasmids E) protist genomes
The principal component of the cell walls of both Gram-positive bacteria and Gram-negative bacteria is _______.
a. chitin b. cellulose c. peptidoglycan d. lipopolysaccaride