Which of the following do NOT contain endoplasmic reticulum? 

A. noneukaryotes
B. animal cells
C. eukaryotic cells
D. All of the choices are correct.


A. noneukaryotes

Biology & Microbiology

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Use the principle of parsimony and molecular genetic data to choose a phylogenetic tree for your hypothesis of how the species were derived from the ancestor.



A. Tree 1 requires the most mutations therefore it would be the best choice.
B. Tree 2 requires 4 mutations while Tree 1 requires 6 mutations therefore Tree 2 would be the best choice.
C. Tree 2 requires the least mutations, therefore it would be the best choice.
D. Tree 2 requires 5 mutations while Tree 1 requires 7 mutations therefore Tree 2, with the least mutations, would be the best choice.
E. Tree 1 requires 7 mutations and Tree 2 requires 4 mutations, therefore Tree 2 would be the best choice.

Biology & Microbiology

Which of the following plant cells has a companion cell?

a. tracheids b. vessel elements c. sieve elements d. sclereids e. fibers

Biology & Microbiology

Which of the following statements best describes the role of NAD+/NADH in glycolysis?

A) NADH is used to directly create the phosphoanhydride bonds in ATP. B) NAD+ accepts electrons. C) NADH accepts electrons during fermentation. D) NADH is used primarily in substrate-level phosphorylation. E) All of the above are correct.

Biology & Microbiology

At which gestational week is the developing human designated a fetus?

a. 4 b. 8 c. 12 d. 16 e. 20

Biology & Microbiology